comparison bindings/as3/ext/com/adobe/net/URI.as @ 732:3a0b9700b3d2

* Initial AS3 commit

+/*
+  Copyright (c) 2008, Adobe Systems Incorporated
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without 
+  modification, are permitted provided that the following conditions are
+  met:
+
+  * Redistributions of source code must retain the above copyright notice, 
+    this list of conditions and the following disclaimer.
+  
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the 
+    documentation and/or other materials provided with the distribution.
+  
+  * Neither the name of Adobe Systems Incorporated nor the names of its 
+    contributors may be used to endorse or promote products derived from 
+    this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
+  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package com.adobe.net
+{
+	import flash.utils.ByteArray;
+	
+	/**
+	 * This class implements functions and utilities for working with URI's
+	 * (Universal Resource Identifiers).  For technical description of the
+	 * URI syntax, please see RFC 3986 at http://www.ietf.org/rfc/rfc3986.txt
+	 * or do a web search for "rfc 3986".
+	 * 
+	 * <p>The most important aspect of URI's to understand is that URI's
+	 * and URL's are not strings.  URI's are complex data structures that
+	 * encapsulate many pieces of information.  The string version of a
+	 * URI is the serialized representation of that data structure.  This
+	 * string serialization is used to provide a human readable
+	 * representation and a means to transport the data over the network
+	 * where it can then be parsed back into its' component parts.</p>
+	 * 
+	 * <p>URI's fall into one of three categories:
+	 * <ul>
+	 *  <li>&lt;scheme&gt;:&lt;scheme-specific-part&gt;#&lt;fragment&gt;		(non-hierarchical)</li>
+	 *  <li>&lt;scheme&gt;:<authority&gt;&lt;path&gt;?&lt;query&gt;#&lt;fragment&gt;	(hierarchical)</li>
+	 *  <li>&lt;path&gt;?&lt;query&gt;#&lt;fragment&gt;						(relative hierarchical)</li>
+	 * </ul></p>
+	 * 
+	 * <p>The query and fragment parts are optional.</p>
+	 * 
+	 * <p>This class supports both non-hierarchical and hierarchical URI's</p>
+	 * 
+	 * <p>This class is intended to be used "as-is" for the vast majority
+	 * of common URI's.  However, if your application requires a custom
+	 * URI syntax (e.g. custom query syntax or special handling of
+	 * non-hierarchical URI's), this class can be fully subclassed.  If you
+	 * intended to subclass URI, please see the source code for complete
+	 * documation on protected members and protected fuctions.</p>
+	 * 
+	 * @langversion ActionScript 3.0
+	 * @playerversion Flash 9.0 
+	 */
+	public class URI
+	{	
+		// Here we define which characters must be escaped for each
+		// URI part.  The characters that must be escaped for each
+		// part differ depending on what would cause ambiguous parsing.
+		// RFC 3986 sec. 2.4 states that characters should only be
+		// encoded when they would conflict with subcomponent delimiters.
+		// We don't want to over-do the escaping.  We only want to escape
+		// the minimum needed to prevent parsing problems.
+		
+		// space and % must be escaped in all cases.  '%' is the delimiter
+		// for escaped characters.
+		public static const URImustEscape:String =	" %";
+		
+		// Baseline of what characters must be escaped
+		public static const URIbaselineEscape:String = URImustEscape + ":?#/@";
+		
+		// Characters that must be escaped in the part part.
+		public static const URIpathEscape:String = URImustEscape + "?#";
+		
+		// Characters that must be escaped in the query part, if setting
+		// the query as a whole string.  If the query is set by
+		// name/value, URIqueryPartEscape is used instead.
+		public static const URIqueryEscape:String = URImustEscape + "#";
+		
+		// This is what each name/value pair must escape "&=" as well
+		// so they don't conflict with the "param=value&param2=value2"
+		// syntax.
+		public static const URIqueryPartEscape:String = URImustEscape + "#&=";
+		
+		// Non-hierarchical URI's can have query and fragment parts, but
+		// we also want to prevent '/' otherwise it might end up looking
+		// like a hierarchical URI to the parser.
+		public static const URInonHierEscape:String = 	URImustEscape + "?#/";
+		
+		// Baseline uninitialized setting for the URI scheme.
+		public static const UNKNOWN_SCHEME:String = "unknown";
+		
+		// The following bitmaps are used for performance enhanced
+		// character escaping.
+		
+		// Baseline characters that need to be escaped.  Many parts use
+		// this.
+		protected static const URIbaselineExcludedBitmap:URIEncodingBitmap =
+			new URIEncodingBitmap(URIbaselineEscape);
+		
+		// Scheme escaping bitmap
+		protected static const URIschemeExcludedBitmap:URIEncodingBitmap = 
+			URIbaselineExcludedBitmap;
+		
+		// User/pass escaping bitmap
+		protected static const URIuserpassExcludedBitmap:URIEncodingBitmap =
+			URIbaselineExcludedBitmap;
+		
+		// Authority escaping bitmap
+		protected static const URIauthorityExcludedBitmap:URIEncodingBitmap =
+			URIbaselineExcludedBitmap;
+			
+		// Port escaping bitmap
+		protected static const URIportExludedBitmap:URIEncodingBitmap = 
+			URIbaselineExcludedBitmap;
+		
+		// Path escaping bitmap
+		protected static const URIpathExcludedBitmap:URIEncodingBitmap =
+		 	new URIEncodingBitmap(URIpathEscape);
+			
+		// Query (whole) escaping bitmap
+		protected static const URIqueryExcludedBitmap:URIEncodingBitmap =
+			new URIEncodingBitmap(URIqueryEscape);
+			
+		// Query (individual parts) escaping bitmap
+		protected static const URIqueryPartExcludedBitmap:URIEncodingBitmap =
+			new URIEncodingBitmap(URIqueryPartEscape);
+			
+		// Fragments are the last part in the URI.  They only need to
+		// escape space, '#', and '%'.  Turns out that is what query
+		// uses too.
+		protected static const URIfragmentExcludedBitmap:URIEncodingBitmap =
+			URIqueryExcludedBitmap;
+			
+		// Characters that need to be escaped in the non-hierarchical part
+		protected static const URInonHierexcludedBitmap:URIEncodingBitmap =
+			new URIEncodingBitmap(URInonHierEscape);
+			
+		// Values used by getRelation()
+		public static const NOT_RELATED:int = 0;
+		public static const CHILD:int = 1;
+		public static const EQUAL:int = 2;
+		public static const PARENT:int = 3;
+
+		//-------------------------------------------------------------------
+		// protected class members
+		//-------------------------------------------------------------------
+		protected var _valid:Boolean = false;
+		protected var _relative:Boolean = false;
+		protected var _scheme:String = "";
+		protected var _authority:String = "";
+		protected var _username:String = "";
+		protected var _password:String = "";
+		protected var _port:String = "";
+		protected var _path:String = "";
+		protected var _query:String = "";
+		protected var _fragment:String = "";
+		protected var _nonHierarchical:String = "";
+		protected static var _resolver:IURIResolver = null;
+
+
+		/**
+		 *  URI Constructor.  If no string is given, this will initialize
+		 *  this URI object to a blank URI.
+		 */
+		public function URI(uri:String = null) : void	
+		{
+			if (uri == null)
+				initialize();
+			else
+				constructURI(uri);
+		}
+
+		
+		/**
+		 * @private
+		 * Method that loads the URI from the given string.
+		 */
+		protected function constructURI(uri:String) : Boolean
+		{
+			if (!parseURI(uri))
+				_valid = false;
+				
+			return isValid();
+		}
+		
+		
+		/**
+		 * @private Private initializiation.
+		 */
+		protected function initialize() : void
+		{
+			_valid = false;
+			_relative = false;
+		
+			_scheme = UNKNOWN_SCHEME;
+			_authority = "";
+			_username = "";
+			_password = "";
+			_port = "";
+			_path = "";
+			_query = "";
+			_fragment = "";
+		
+			_nonHierarchical = "";
+		}	
+		
+		/**
+		 * @private Accessor to explicitly set/get the hierarchical
+		 * state of the URI.
+		 */
+		protected function set hierState(state:Boolean) : void
+		{
+			if (state)
+			{
+				// Clear the non-hierarchical data
+				_nonHierarchical = "";
+		
+				// Also set the state vars while we are at it
+				if (_scheme == "" || _scheme == UNKNOWN_SCHEME)
+					_relative = true;
+				else
+					_relative = false;
+		
+				if (_authority.length == 0 && _path.length == 0)
+					_valid = false;
+				else
+					_valid = true;
+			}
+			else
+			{
+				// Clear the hierarchical data
+				_authority = "";
+				_username = "";
+				_password = "";
+				_port = "";
+				_path = "";
+		
+				_relative = false;
+		
+				if (_scheme == "" || _scheme == UNKNOWN_SCHEME)
+					_valid = false;
+				else
+					_valid = true;
+			}
+		}
+		protected function get hierState() : Boolean
+		{
+			return (_nonHierarchical.length == 0);
+		}
+		
+		
+		/**
+		 * @private Functions that performs some basic consistency validation.
+		 */
+		protected function validateURI() : Boolean
+		{
+			// Check the scheme
+			if (isAbsolute())
+			{
+				if (_scheme.length <= 1 || _scheme == UNKNOWN_SCHEME)
+				{
+					// we probably parsed a C:\ type path or no scheme
+					return false;
+				}
+				else if (verifyAlpha(_scheme) == false)
+					return false;  // Scheme contains bad characters
+			}
+			
+			if (hierState)
+			{
+				if (_path.search('\\') != -1)
+					return false;  // local path
+				else if (isRelative() == false && _scheme == UNKNOWN_SCHEME)
+					return false;  // It's an absolute URI, but it has a bad scheme
+			}
+			else
+			{
+				if (_nonHierarchical.search('\\') != -1)
+					return false;  // some kind of local path
+			}
+		
+			// Looks like it's ok.
+			return true;
+		}
+		
+		
+		/**
+		 * @private
+		 *
+		 * Given a URI in string format, parse that sucker into its basic
+		 * components and assign them to this object.  A URI is of the form:
+		 *    <scheme>:<authority><path>?<query>#<fragment>
+		 *
+		 * For simplicity, we parse the URI in the following order:
+		 * 		
+		 *		1. Fragment (anchors)
+		 * 		2. Query	(CGI stuff)
+		 * 		3. Scheme	("http")
+		 * 		4. Authority (host name)
+		 * 		5. Username/Password (if any)
+		 * 		6. Port		(server port if any)
+		 *		7. Path		(/homepages/mypage.html)
+		 *
+		 * The reason for this order is to minimize any parsing ambiguities.
+		 * Fragments and queries can contain almost anything (they are parts
+		 * that can contain custom data with their own syntax).  Parsing
+		 * them out first removes a large chance of parsing errors.  This
+		 * method expects well formed URI's, but performing the parse in
+		 * this order makes us a little more tolerant of user error.
+		 * 
+		 * REGEXP
+		 * Why doesn't this use regular expressions to parse the URI?  We
+		 * have found that in a real world scenario, URI's are not always
+		 * well formed.  Sometimes characters that should have been escaped
+		 * are not, and those situations would break a regexp pattern.  This
+		 * function attempts to be smart about what it is parsing based on
+		 * location of characters relative to eachother.  This function has
+		 * been proven through real-world use to parse the vast majority
+		 * of URI's correctly.
+		 *
+		 * NOTE
+		 * It is assumed that the string in URI form is escaped.  This function
+		 * does not escape anything.  If you constructed the URI string by
+		 * hand, and used this to parse in the URI and still need it escaped,
+		 * call forceEscape() on your URI object.
+		 *
+		 * Parsing Assumptions
+		 * This routine assumes that the URI being passed is well formed.
+		 * Passing things like local paths, malformed URI's, and the such
+		 * will result in parsing errors.  This function can handle
+		 * 	 - absolute hierarchical (e.g. "http://something.com/index.html),
+		 *   - relative hierarchical (e.g. "../images/flower.gif"), or
+		 *   - non-hierarchical URIs (e.g. "mailto:[e-mail]").
+		 * 
+		 * Anything else will probably result in a parsing error, or a bogus
+		 * URI object.
+		 * 
+		 * Note that non-hierarchical URIs *MUST* have a scheme, otherwise
+		 * they will be mistaken for relative URI's.
+		 * 
+		 * If you are not sure what is being passed to you (like manually
+		 * entered text from UI), you can construct a blank URI object and
+		 * call unknownToURI() passing in the unknown string.
+		 * 
+		 * @return	true if successful, false if there was some kind of
+		 * parsing error
+		 */
+		protected function parseURI(uri:String) : Boolean
+		{
+			var baseURI:String = uri;
+			var index:int, index2:int;
+		
+			// Make sure this object is clean before we start.  If it was used
+			// before and we are now parsing a new URI, we don't want any stale
+			// info lying around.
+			initialize();
+		
+			// Remove any fragments (anchors) from the URI
+			index = baseURI.indexOf("#");
+			if (index != -1)
+			{
+				// Store the fragment piece if any
+				if (baseURI.length > (index + 1)) // +1 is to skip the '#'
+					_fragment = baseURI.substr(index + 1, baseURI.length - (index + 1)); 
+		
+				// Trim off the fragment
+				baseURI = baseURI.substr(0, index);
+			}
+		
+			// We need to strip off any CGI parameters (eg '?param=bob')
+			index = baseURI.indexOf("?");
+			if (index != -1)
+			{
+				if (baseURI.length > (index + 1))
+					_query = baseURI.substr(index + 1, baseURI.length - (index + 1)); // +1 is to skip the '?'
+		
+				// Trim off the query
+				baseURI = baseURI.substr(0, index);
+			}
+		
+			// Now try to find the scheme part
+			index = baseURI.search(':');
+			index2 = baseURI.search('/');
+		
+			var containsColon:Boolean = (index != -1);
+			var containsSlash:Boolean = (index2 != -1);
+		
+			// This value is indeterminate if "containsColon" is false.
+			// (if there is no colon, does the slash come before or
+			// after said non-existing colon?)
+			var colonBeforeSlash:Boolean = (!containsSlash || index < index2);
+		
+			// If it has a colon and it's before the first slash, we will treat
+			// it as a scheme.  If a slash is before a colon, there must be a
+			// stray colon in a path or something.  In which case, the colon is
+			// not the separator for the scheme.  Technically, we could consider
+			// this an error, but since this is not an ambiguous state (we know
+			// 100% that this has no scheme), we will keep going.
+			if (containsColon && colonBeforeSlash)
+			{
+				// We found a scheme
+				_scheme = baseURI.substr(0, index);
+				
+				// Normalize the scheme
+				_scheme = _scheme.toLowerCase();
+		
+				baseURI = baseURI.substr(index + 1);
+		
+				if (baseURI.substr(0, 2) == "//")
+				{
+					// This is a hierarchical URI
+					_nonHierarchical = "";
+		
+					// Trim off the "//"
+					baseURI = baseURI.substr(2, baseURI.length - 2);
+				}
+				else
+				{
+					// This is a non-hierarchical URI like "mailto:[e-mail]"
+					_nonHierarchical = baseURI;
+		
+					if ((_valid = validateURI()) == false)
+						initialize();  // Bad URI.  Clear it.
+		
+					// No more parsing to do for this case
+					return isValid();
+				}
+			}
+			else
+			{
+				// No scheme.  We will consider this a relative URI
+				_scheme = "";
+				_relative = true;
+				_nonHierarchical = "";
+			}
+		
+			// Ok, what we have left is everything after the <scheme>://
+		
+			// Now that we have stripped off any query and fragment parts, we
+			// need to split the authority from the path
+		
+			if (isRelative())
+			{
+				// Don't bother looking for the authority.  It's a relative URI
+				_authority = "";
+				_port = "";
+				_path = baseURI;
+			}
+			else
+			{
+				// Check for malformed UNC style file://///server/type/path/
+				// By the time we get here, we have already trimmed the "file://"
+				// so baseURI will be ///server/type/path.  If baseURI only
+				// has one slash, we leave it alone because that is valid (that
+				// is the case of "file:///path/to/file.txt" where there is no
+				// server - implicit "localhost").
+				if (baseURI.substr(0, 2) == "//")
+				{
+					// Trim all leading slashes
+					while(baseURI.charAt(0) == "/")
+						baseURI = baseURI.substr(1, baseURI.length - 1);
+				}
+		
+				index = baseURI.search('/');
+				if (index == -1)
+				{
+					// No path.  We must have passed something like "http://something.com"
+					_authority = baseURI;
+					_path = "";
+				}
+				else
+				{
+					_authority = baseURI.substr(0, index);
+					_path = baseURI.substr(index, baseURI.length - index);
+				}
+		
+				// Check to see if the URI has any username or password information.
+				// For example:  ftp://username:[e-mail]
+				index = _authority.search('@');
+				if (index != -1)
+				{
+					// We have a username and possibly a password
+					_username = _authority.substr(0, index);
+		
+					// Remove the username/password from the authority
+					_authority = _authority.substr(index + 1);  // Skip the '@'
+		
+					// Now check to see if the username also has a password
+					index = _username.search(':');
+					if (index != -1)
+					{
+						_password = _username.substring(index + 1, _username.length);
+						_username = _username.substr(0, index);
+					}
+					else
+						_password = "";
+				}
+				else
+				{
+					_username = "";
+					_password = "";
+				}
+		
+				// Lastly, check to see if the authorty has a port number.
+				// This is parsed after the username/password to avoid conflicting
+				// with the ':' in the 'username:password' if one exists.
+				index = _authority.search(':');
+				if (index != -1)
+				{
+					_port = _authority.substring(index + 1, _authority.length);  // skip the ':'
+					_authority = _authority.substr(0, index);
+				}
+				else
+				{
+					_port = "";
+				}
+				
+				// Lastly, normalize the authority.  Domain names
+				// are case insensitive.
+				_authority = _authority.toLowerCase();
+			}
+		
+			if ((_valid = validateURI()) == false)
+				initialize();  // Bad URI.  Clear it
+		
+			return isValid();
+		}
+		
+		
+		/********************************************************************
+		 * Copy function.
+		 */
+		public function copyURI(uri:URI) : void
+		{
+			this._scheme = uri._scheme;
+			this._authority = uri._authority;
+			this._username = uri._username;
+			this._password = uri._password;
+			this._port = uri._port;
+			this._path = uri._path;
+			this._query = uri._query;
+			this._fragment = uri._fragment;
+			this._nonHierarchical = uri._nonHierarchical;
+		
+			this._valid = uri._valid;
+			this._relative = uri._relative;
+		}
+		
+		
+		/**
+		 * @private
+		 * Checks if the given string only contains a-z or A-Z.
+		 */
+		protected function verifyAlpha(str:String) : Boolean
+		{
+			var pattern:RegExp = /[^a-z]/;
+			var index:int;
+			
+			str = str.toLowerCase();
+			index = str.search(pattern);
+			
+			if (index == -1)
+				return true;
+			else
+				return false;
+		}
+		
+		/**
+		 * Is this a valid URI?
+		 * 
+		 * @return true if this object represents a valid URI, false
+		 * otherwise.
+		 */
+		public function isValid() : Boolean
+		{ 
+			return this._valid;
+		}
+		
+		
+		/**
+		 * Is this URI an absolute URI?  An absolute URI is a complete, fully
+		 * qualified reference to a resource.  e.g. http://site.com/index.htm
+		 * Non-hierarchical URI's are always absolute.
+		 */
+		public function isAbsolute() : Boolean
+		{ 
+			return !this._relative;
+		}
+		
+		
+		/**
+		 * Is this URI a relative URI?  Relative URI's do not have a scheme
+		 * and only contain a relative path with optional anchor and query
+		 * parts.  e.g. "../reports/index.htm".  Non-hierarchical URI's
+		 * will never be relative.
+		 */
+		public function isRelative() : Boolean
+		{ 
+			return this._relative;
+		}
+		
+		
+		/**
+		 * Does this URI point to a resource that is a directory/folder?
+		 * The URI specification dictates that any path that ends in a slash
+		 * is a directory.  This is needed to be able to perform correct path
+		 * logic when combining relative URI's with absolute URI's to
+		 * obtain the correct absolute URI to a resource.
+		 * 
+		 * @see URI.chdir
+		 * 
+		 * @return true if this URI represents a directory resource, false
+		 * if this URI represents a file resource.
+		 */
+		public function isDirectory() : Boolean
+		{
+			if (_path.length == 0)
+				return false;
+		
+			return (_path.charAt(path.length - 1) == '/');
+		}
+		
+		
+		/**
+		 * Is this URI a hierarchical URI? URI's can be  
+		 */
+		public function isHierarchical() : Boolean
+		{ 
+			return hierState;
+		}
+				
+		
+		/**
+		 * The scheme of the URI.
+		 */
+		public function get scheme() : String
+		{ 
+			return URI.unescapeChars(_scheme);
+		}
+		public function set scheme(schemeStr:String) : void
+		{
+			// Normalize the scheme
+			var normalized:String = schemeStr.toLowerCase();
+			_scheme = URI.fastEscapeChars(normalized, URI.URIschemeExcludedBitmap);
+		}
+		
+		
+		/**
+		 * The authority (host) of the URI.  Only valid for
+		 * hierarchical URI's.  If the URI is relative, this will
+		 * be an empty string. When setting this value, the string
+		 * given is assumed to be unescaped.  When retrieving this
+		 * value, the resulting string is unescaped.
+		 */
+		public function get authority() : String
+		{ 
+			return URI.unescapeChars(_authority);
+		}
+		public function set authority(authorityStr:String) : void
+		{
+			// Normalize the authority
+			authorityStr = authorityStr.toLowerCase();
+			
+			_authority = URI.fastEscapeChars(authorityStr,
+				URI.URIauthorityExcludedBitmap);
+			
+			// Only hierarchical URI's can have an authority, make
+			// sure this URI is of the proper format.
+			this.hierState = true;
+		}
+		
+		
+		/**
+		 * The username of the URI.  Only valid for hierarchical
+		 * URI's.  If the URI is relative, this will be an empty
+		 * string.
+		 * 
+		 * <p>The URI specification allows for authentication
+		 * credentials to be embedded in the URI as such:</p>
+		 * 
+		 * <p>http://user:passwd&#64;host/path/to/file.htm</p>
+		 * 
+		 * <p>When setting this value, the string
+		 * given is assumed to be unescaped.  When retrieving this
+		 * value, the resulting string is unescaped.</p>
+		 */
+		public function get username() : String
+		{
+			return URI.unescapeChars(_username);
+		}
+		public function set username(usernameStr:String) : void
+		{
+			_username = URI.fastEscapeChars(usernameStr, URI.URIuserpassExcludedBitmap);
+			
+			// Only hierarchical URI's can have a username.
+			this.hierState = true;
+		}
+		
+		
+		/**
+		 * The password of the URI.  Similar to username.
+		 * @see URI.username
+		 */
+		public function get password() : String
+		{
+			return URI.unescapeChars(_password);
+		}
+		public function set password(passwordStr:String) : void
+		{
+			_password = URI.fastEscapeChars(passwordStr,
+				URI.URIuserpassExcludedBitmap);
+			
+			// Only hierarchical URI's can have a password.
+			this.hierState = true;
+		}
+		
+		
+		/**
+		 * The host port number.  Only valid for hierarchical URI's.  If
+		 * the URI is relative, this will be an empty string. URI's can
+		 * contain the port number of the remote host:
+		 * 
+		 * <p>http://site.com:8080/index.htm</p>
+		 */
+		public function get port() : String
+		{ 
+			return URI.unescapeChars(_port);
+		}
+		public function set port(portStr:String) : void
+		{
+			_port = URI.escapeChars(portStr);
+			
+			// Only hierarchical URI's can have a port.
+			this.hierState = true;
+		}
+		
+		
+		/**
+		 * The path portion of the URI.  Only valid for hierarchical
+		 * URI's.  When setting this value, the string
+		 * given is assumed to be unescaped.  When retrieving this
+		 * value, the resulting string is unescaped.
+		 * 
+		 * <p>The path portion can be in one of two formats. 1) an absolute
+		 * path, or 2) a relative path.  An absolute path starts with a
+		 * slash ('/'), a relative path does not.</p>
+		 * 
+		 * <p>An absolute path may look like:</p>
+		 * <listing>/full/path/to/my/file.htm</listing>
+		 * 
+		 * <p>A relative path may look like:</p>
+		 * <listing>
+		 * path/to/my/file.htm
+		 * ../images/logo.gif
+		 * ../../reports/index.htm
+		 * </listing>
+		 * 
+		 * <p>Paths can be absolute or relative.  Note that this not the same as
+		 * an absolute or relative URI.  An absolute URI can only have absolute
+		 * paths.  For example:</p>
+		 * 
+		 * <listing>http:/site.com/path/to/file.htm</listing>
+		 * 
+		 * <p>This absolute URI has an absolute path of "/path/to/file.htm".</p>
+		 * 
+		 * <p>Relative URI's can have either absolute paths or relative paths.
+		 * All of the following relative URI's are valid:</p>
+		 * 
+		 * <listing>
+		 * /absolute/path/to/file.htm
+		 * path/to/file.htm
+		 * ../path/to/file.htm
+		 * </listing>
+		 */
+		public function get path() : String
+		{ 
+			return URI.unescapeChars(_path);
+		}
+		public function set path(pathStr:String) : void
+		{	
+			this._path = URI.fastEscapeChars(pathStr, URI.URIpathExcludedBitmap);
+		
+			if (this._scheme == UNKNOWN_SCHEME)
+			{
+				// We set the path.  This is a valid URI now.
+				this._scheme = "";
+			}
+		
+			// Only hierarchical URI's can have a path.
+			hierState = true;
+		}
+		
+		
+		/**
+		 * The query (CGI) portion of the URI.  This part is valid for
+		 * both hierarchical and non-hierarchical URI's.
+		 * 
+		 * <p>This accessor should only be used if a custom query syntax
+		 * is used.  This URI class supports the common "param=value"
+		 * style query syntax via the get/setQueryValue() and
+		 * get/setQueryByMap() functions.  Those functions should be used
+		 * instead if the common syntax is being used.
+		 * 
+		 * <p>The URI RFC does not specify any particular
+		 * syntax for the query part of a URI.  It is intended to allow
+		 * any format that can be agreed upon by the two communicating hosts.
+		 * However, most systems have standardized on the typical CGI
+		 * format:</p>
+		 * 
+		 * <listing>http://site.com/script.php?param1=value1&param2=value2</listing>
+		 * 
+		 * <p>This class has specific support for this query syntax</p>
+		 * 
+		 * <p>This common query format is an array of name/value
+		 * pairs with its own syntax that is different from the overall URI
+		 * syntax.  The query has its own escaping logic.  For a query part
+		 * to be properly escaped and unescaped, it must be split into its
+		 * component parts.  This accessor escapes/unescapes the entire query
+		 * part without regard for it's component parts.  This has the
+		 * possibliity of leaving the query string in an ambiguious state in
+		 * regards to its syntax.  If the contents of the query part are
+		 * important, it is recommended that get/setQueryValue() or
+		 * get/setQueryByMap() are used instead.</p>
+		 * 
+		 * If a different query syntax is being used, a subclass of URI
+		 * can be created to handle that specific syntax.
+		 *  
+		 * @see URI.getQueryValue, URI.getQueryByMap
+		 */
+		public function get query() : String
+		{ 
+			return URI.unescapeChars(_query);
+		}
+		public function set query(queryStr:String) : void
+		{
+			_query = URI.fastEscapeChars(queryStr, URI.URIqueryExcludedBitmap);
+			
+			// both hierarchical and non-hierarchical URI's can
+			// have a query.  Do not set the hierState.
+		}
+		
+		/**
+		 * Accessor to the raw query data.  If you are using a custom query
+		 * syntax, this accessor can be used to get and set the query part
+		 * directly with no escaping/unescaping.  This should ONLY be used
+		 * if your application logic is handling custom query logic and
+		 * handling the proper escaping of the query part.
+		 */
+		public function get queryRaw() : String
+		{
+			return _query;
+		}
+		public function set queryRaw(queryStr:String) : void
+		{
+			_query = queryStr;
+		}
+
+
+		/**
+		 * The fragment (anchor) portion of the URI.  This is valid for
+		 * both hierarchical and non-hierarchical URI's.
+		 */
+		public function get fragment() : String
+		{ 
+			return URI.unescapeChars(_fragment);
+		}
+		public function set fragment(fragmentStr:String) : void
+		{
+			_fragment = URI.fastEscapeChars(fragmentStr, URIfragmentExcludedBitmap);
+
+			// both hierarchical and non-hierarchical URI's can
+			// have a fragment.  Do not set the hierState.
+		}
+		
+		
+		/**
+		 * The non-hierarchical part of the URI.  For example, if
+		 * this URI object represents "mailto:[e-mail]",
+		 * this will contain "[e-mail]".  This is valid only
+		 * for non-hierarchical URI's.  
+		 */
+		public function get nonHierarchical() : String
+		{ 
+			return URI.unescapeChars(_nonHierarchical);
+		}
+		public function set nonHierarchical(nonHier:String) : void
+		{
+			_nonHierarchical = URI.fastEscapeChars(nonHier, URInonHierexcludedBitmap);
+			
+			// This is a non-hierarchical URI.
+			this.hierState = false;
+		}
+		
+		
+		/**
+		 * Quick shorthand accessor to set the parts of this URI.
+		 * The given parts are assumed to be in unescaped form.  If
+		 * the URI is non-hierarchical (e.g. mailto:) you will need
+		 * to call SetScheme() and SetNonHierarchical().
+		 */
+		public function setParts(schemeStr:String, authorityStr:String,
+				portStr:String, pathStr:String, queryStr:String,
+				fragmentStr:String) : void
+		{
+			this.scheme = schemeStr;
+			this.authority = authorityStr;
+			this.port = portStr;
+			this.path = pathStr;
+			this.query = queryStr;
+			this.fragment = fragmentStr;
+
+			hierState = true;
+		}
+		
+		
+		/**
+		 * URI escapes the given character string.  This is similar in function
+		 * to the global encodeURIComponent() function in ActionScript, but is
+		 * slightly different in regards to which characters get escaped.  This
+		 * escapes the characters specified in the URIbaselineExluded set (see class
+		 * static members).  This is needed for this class to work properly.
+		 * 
+		 * <p>If a different set of characters need to be used for the escaping,
+		 * you may use fastEscapeChars() and specify a custom URIEncodingBitmap
+		 * that contains the characters your application needs escaped.</p>
+		 * 
+		 * <p>Never pass a full URI to this function.  A URI can only be properly
+		 * escaped/unescaped when split into its component parts (see RFC 3986
+		 * section 2.4).  This is due to the fact that the URI component separators
+		 * could be characters that would normally need to be escaped.</p>
+		 * 
+		 * @param unescaped character string to be escaped.
+		 * 
+		 * @return	escaped character string
+		 * 
+		 * @see encodeURIComponent
+		 * @see fastEscapeChars
+		 */
+		static public function escapeChars(unescaped:String) : String
+		{
+			// This uses the excluded set by default.
+			return fastEscapeChars(unescaped, URI.URIbaselineExcludedBitmap);
+		}
+		
+
+		/**
+		 * Unescape any URI escaped characters in the given character
+		 * string.
+		 * 
+		 * <p>Never pass a full URI to this function.  A URI can only be properly
+		 * escaped/unescaped when split into its component parts (see RFC 3986
+		 * section 2.4).  This is due to the fact that the URI component separators
+		 * could be characters that would normally need to be escaped.</p>
+		 * 
+		 * @param escaped the escaped string to be unescaped.
+		 * 
+		 * @return	unescaped string.
+		 */
+		static public function unescapeChars(escaped:String /*, onlyHighASCII:Boolean = false*/) : String
+		{
+			// We can just use the default AS function.  It seems to
+			// decode everything correctly
+			var unescaped:String;
+			unescaped = decodeURIComponent(escaped);
+			return unescaped;
+		}
+		
+		/**
+		 * Performance focused function that escapes the given character
+		 * string using the given URIEncodingBitmap as the rule for what
+		 * characters need to be escaped.  This function is used by this
+		 * class and can be used externally to this class to perform
+		 * escaping on custom character sets.
+		 * 
+		 * <p>Never pass a full URI to this function.  A URI can only be properly
+		 * escaped/unescaped when split into its component parts (see RFC 3986
+		 * section 2.4).  This is due to the fact that the URI component separators
+		 * could be characters that would normally need to be escaped.</p>
+		 * 
+		 * @param unescaped		the unescaped string to be escaped
+		 * @param bitmap		the set of characters that need to be escaped
+		 * 
+		 * @return	the escaped string.
+		 */
+		static public function fastEscapeChars(unescaped:String, bitmap:URIEncodingBitmap) : String
+		{
+			var escaped:String = "";
+			var c:String;
+			var x:int, i:int;
+			
+			for (i = 0; i < unescaped.length; i++)
+			{
+				c = unescaped.charAt(i);
+				
+				x = bitmap.ShouldEscape(c);
+				if (x)
+				{
+					c = x.toString(16);
+					if (c.length == 1)
+						c = "0" + c;
+						
+					c = "%" + c;
+					c = c.toUpperCase();
+				}
+				
+				escaped += c;
+			}
+			
+			return escaped;
+		}
+
+		
+		/**
+		 * Is this URI of a particular scheme type?  For example,
+		 * passing "http" to a URI object that represents the URI
+		 * "http://site.com/" would return true.
+		 * 
+		 * @param scheme	scheme to check for
+		 * 
+		 * @return true if this URI object is of the given type, false
+		 * otherwise.
+		 */
+		public function isOfType(scheme:String) : Boolean
+		{
+			// Schemes are never case sensitive.  Ignore case.
+			scheme = scheme.toLowerCase();
+			return (this._scheme == scheme);
+		}
+
+
+		/**
+		 * Get the value for the specified named in the query part.  This
+		 * assumes the query part of the URI is in the common
+		 * "name1=value1&name2=value2" syntax.  Do not call this function
+		 * if you are using a custom query syntax.
+		 * 
+		 * @param name	name of the query value to get.
+		 * 
+		 * @return the value of the query name, empty string if the
+		 * query name does not exist.
+		 */
+		public function getQueryValue(name:String) : String
+		{
+			var map:Object;
+			var item:String;
+			var value:String;
+		
+			map = getQueryByMap();
+		
+			for (item in map)
+			{
+				if (item == name)
+				{
+					value = map[item];
+					return value;
+				}
+			}
+		
+			// Didn't find the specified key
+			return new String("");
+		}
+		
+
+		/**
+		 * Set the given value on the given query name.  If the given name
+		 * does not exist, it will automatically add this name/value pair
+		 * to the query.  If null is passed as the value, it will remove
+		 * the given item from the query.
+		 * 
+		 * <p>This automatically escapes any characters that may conflict with
+		 * the query syntax so that they are "safe" within the query.  The
+		 * strings passed are assumed to be literal unescaped name and value.</p>
+		 * 
+		 * @param name	name of the query value to set
+		 * @param value	value of the query item to set.  If null, this will
+		 * force the removal of this item from the query.
+		 */
+		public function setQueryValue(name:String, value:String) : void
+		{
+			var map:Object;
+
+			map = getQueryByMap();
+		
+			// If the key doesn't exist yet, this will create a new pair in
+			// the map.  If it does exist, this will overwrite the previous
+			// value, which is what we want.
+			map[name] = value;
+		
+			setQueryByMap(map);
+		}
+
+		
+		/**
+		 * Get the query of the URI in an Object class that allows for easy
+		 * access to the query data via Object accessors.  For example:
+		 * 
+		 * <listing>
+		 * var query:Object = uri.getQueryByMap();
+		 * var value:String = query["param"];    // get a value
+		 * query["param2"] = "foo";   // set a new value
+		 * </listing>
+		 * 
+		 * @return Object that contains the name/value pairs of the query.
+		 * 
+		 * @see #setQueryByMap
+		 * @see #getQueryValue
+		 * @see #setQueryValue
+		 */
+		public function getQueryByMap() : Object
+		{
+			var queryStr:String;
+			var pair:String;
+			var pairs:Array;
+			var item:Array;
+			var name:String, value:String;
+			var index:int;
+			var map:Object = new Object();
+		
+		
+			// We need the raw query string, no unescaping.
+			queryStr = this._query;
+			
+			pairs = queryStr.split('&');
+			for each (pair in pairs)
+			{
+				if (pair.length == 0)
+				  continue;
+				  
+				item = pair.split('=');
+				
+				if (item.length > 0)
+					name = item[0];
+				else
+					continue;  // empty array
+				
+				if (item.length > 1)
+					value = item[1];
+				else
+					value = "";
+					
+				name = queryPartUnescape(name);
+				value = queryPartUnescape(value);
+				
+				map[name] = value;
+			}
+	
+			return map;
+		}
+		
+
+		/**
+		 * Set the query part of this URI using the given object as the
+		 * content source.  Any member of the object that has a value of
+		 * null will not be in the resulting query.
+		 * 
+		 * @param map	object that contains the name/value pairs as
+		 *    members of that object.
+		 * 
+		 * @see #getQueryByMap
+		 * @see #getQueryValue
+		 * @see #setQueryValue
+		 */
+		public function setQueryByMap(map:Object) : void
+		{
+			var item:String;
+			var name:String, value:String;
+			var queryStr:String = "";
+			var tmpPair:String;
+			var foo:String;
+		
+			for (item in map)
+			{
+				name = item;
+				value = map[item];
+		
+				if (value == null)
+					value = "";
+				
+				// Need to escape the name/value pair so that they
+				// don't conflict with the query syntax (specifically
+				// '=', '&', and <whitespace>).
+				name = queryPartEscape(name);
+				value = queryPartEscape(value);
+				
+				tmpPair = name;
+				
+				if (value.length > 0)
+				{
+					tmpPair += "=";
+					tmpPair += value;
+				}
+
+				if (queryStr.length != 0)
+					queryStr += '&';  // Add the separator
+		
+				queryStr += tmpPair;
+			}
+		
+			// We don't want to escape.  We already escaped the
+			// individual name/value pairs.  If we escaped the
+			// query string again by assigning it to "query",
+			// we would have double escaping.
+			_query = queryStr;
+		}
+		
+		
+		/**
+		 * Similar to Escape(), except this also escapes characters that
+		 * would conflict with the name/value pair query syntax.  This is
+		 * intended to be called on each individual "name" and "value"
+		 * in the query making sure that nothing in the name or value
+		 * strings contain characters that would conflict with the query
+		 * syntax (e.g. '=' and '&').
+		 * 
+		 * @param unescaped		unescaped string that is to be escaped.
+		 * 
+		 * @return escaped string.
+		 * 
+		 * @see #queryUnescape
+		 */
+		static public function queryPartEscape(unescaped:String) : String
+		{
+			var escaped:String = unescaped;
+			escaped = URI.fastEscapeChars(unescaped, URI.URIqueryPartExcludedBitmap);
+			return escaped;
+		}
+		
+
+		/**
+		 * Unescape the individual name/value string pairs.
+		 * 
+		 * @param escaped	escaped string to be unescaped
+		 * 
+		 * @return unescaped string
+		 * 
+		 * @see #queryEscape
+		 */
+		static public function queryPartUnescape(escaped:String) : String
+		{
+			var unescaped:String = escaped;
+			unescaped = unescapeChars(unescaped);
+			return unescaped;
+		}
+		
+		/**
+		 * Output this URI as a string.  The resulting string is properly
+		 * escaped and well formed for machine processing.
+		 */
+		public function toString() : String
+		{
+			if (this == null)
+				return "";
+			else
+				return toStringInternal(false);
+		}
+		
+		/**
+		 * Output the URI as a string that is easily readable by a human.
+		 * This outputs the URI with all escape sequences unescaped to
+		 * their character representation.  This makes the URI easier for
+		 * a human to read, but the URI could be completely invalid
+		 * because some unescaped characters may now cause ambiguous parsing.
+		 * This function should only be used if you want to display a URI to
+		 * a user.  This function should never be used outside that specific
+		 * case.
+		 * 
+		 * @return the URI in string format with all escape sequences
+		 * unescaped.
+		 * 
+		 * @see #toString
+		 */
+		public function toDisplayString() : String
+		{
+			return toStringInternal(true);
+		}
+		
+		
+		/**
+		 * @private
+		 * 
+		 * The guts of toString()
+		 */
+		protected function toStringInternal(forDisplay:Boolean) : String
+		{
+			var uri:String = "";
+			var part:String = "";
+		
+			if (isHierarchical() == false)
+			{
+				// non-hierarchical URI
+		
+				uri += (forDisplay ? this.scheme : _scheme);
+				uri += ":";
+				uri += (forDisplay ? this.nonHierarchical : _nonHierarchical);
+			}
+			else
+			{
+				// Hierarchical URI
+		
+				if (isRelative() == false)
+				{
+					// If it is not a relative URI, then we want the scheme and
+					// authority parts in the string.  If it is relative, we
+					// do NOT want this stuff.
+		
+					if (_scheme.length != 0)
+					{
+						part = (forDisplay ? this.scheme : _scheme);
+						uri += part + ":";
+					}
+		
+					if (_authority.length != 0 || isOfType("file"))
+					{
+						uri += "//";
+		
+						// Add on any username/password associated with this
+						// authority
+						if (_username.length != 0)
+						{
+							part = (forDisplay ? this.username : _username);
+							uri += part;
+		
+							if (_password.length != 0)
+							{
+								part = (forDisplay ? this.password : _password);
+								uri += ":" + part;
+							}
+		
+							uri += "@";
+						}
+		
+						// add the authority
+						part = (forDisplay ? this.authority : _authority);
+						uri += part;
+		
+						// Tack on the port number, if any
+						if (port.length != 0)
+							uri += ":" + port;
+					}
+				}
+		
+				// Tack on the path
+				part = (forDisplay ? this.path : _path);
+				uri += part;
+		
+			} // end hierarchical part
+		
+			// Both non-hier and hierarchical have query and fragment parts
+		
+			// Add on the query and fragment parts
+			if (_query.length != 0)
+			{
+				part = (forDisplay ? this.query : _query);
+				uri += "?" + part;
+			}
+		
+			if (fragment.length != 0)
+			{
+				part = (forDisplay ? this.fragment : _fragment);
+				uri += "#" + part;
+			}
+		
+			return uri;
+		}
+	
+		/**
+		 * Forcefully ensure that this URI is properly escaped.
+		 * 
+		 * <p>Sometimes URI's are constructed by hand using strings outside
+		 * this class.  In those cases, it is unlikely the URI has been
+		 * properly escaped.  This function forcefully escapes this URI
+		 * by unescaping each part and then re-escaping it.  If the URI
+		 * did not have any escaping, the first unescape will do nothing
+		 * and then the re-escape will properly escape everything.  If
+		 * the URI was already escaped, the unescape and re-escape will
+		 * essentally be a no-op.  This provides a safe way to make sure
+		 * a URI is in the proper escaped form.</p>
+		 */
+		public function forceEscape() : void
+		{
+			// The accessors for each of the members will unescape
+			// and then re-escape as we get and assign them.
+			
+			// Handle the parts that are common for both hierarchical
+			// and non-hierarchical URI's
+			this.scheme = this.scheme;
+			this.setQueryByMap(this.getQueryByMap());
+			this.fragment = this.fragment;
+			
+			if (isHierarchical())
+			{
+				this.authority = this.authority;
+				this.path = this.path;
+				this.port = this.port;
+				this.username = this.username;
+				this.password = this.password;
+			}
+			else
+			{
+				this.nonHierarchical = this.nonHierarchical;
+			}
+		}
+		
+		
+		/**
+		 * Does this URI point to a resource of the given file type?
+		 * Given a file extension (or just a file name, this will strip the
+		 * extension), check to see if this URI points to a file of that
+		 * type.
+		 * 
+		 * @param extension 	string that contains a file extension with or
+		 * without a dot ("html" and ".html" are both valid), or a file
+		 * name with an extension (e.g. "index.html").
+		 * 
+		 * @return true if this URI points to a resource with the same file
+		 * file extension as the extension provided, false otherwise.
+		 */
+		public function isOfFileType(extension:String) : Boolean
+		{
+			var thisExtension:String;
+			var index:int;
+		
+			index = extension.lastIndexOf(".");
+			if (index != -1)
+			{
+				// Strip the extension
+				extension = extension.substr(index + 1);
+			}
+			else
+			{
+				// The caller passed something without a dot in it.  We
+				// will assume that it is just a plain extension (e.g. "html").
+				// What they passed is exactly what we want
+			}
+		
+			thisExtension = getExtension(true);
+		
+			if (thisExtension == "")
+				return false;
+		
+			// Compare the extensions ignoring case
+			if (compareStr(thisExtension, extension, false) == 0)
+				return true;
+			else
+				return false;
+		}
+		
+		
+		/**
+		 * Get the ".xyz" file extension from the filename in the URI.
+		 * For example, if we have the following URI:
+		 * 
+		 * <listing>http://something.com/path/to/my/page.html?form=yes&name=bob#anchor</listing>
+		 * 
+		 * <p>This will return ".html".</p>
+		 * 
+		 * @param minusDot   If true, this will strip the dot from the extension.
+		 * If true, the above example would have returned "html".
+		 * 
+		 * @return  the file extension
+		 */
+		public function getExtension(minusDot:Boolean = false) : String
+		{
+			var filename:String = getFilename();
+			var extension:String;
+			var index:int;
+		
+			if (filename == "")
+				return String("");
+		
+			index = filename.lastIndexOf(".");
+		
+			// If it doesn't have an extension, or if it is a "hidden" file,
+			// it doesn't have an extension.  Hidden files on unix start with
+			// a dot (e.g. ".login").
+			if (index == -1 || index == 0)
+				return String("");
+		
+			extension = filename.substr(index);
+		
+			// If the caller does not want the dot, remove it.
+			if (minusDot && extension.charAt(0) == ".")
+				extension = extension.substr(1);
+		
+			return extension;
+		}
+		
+		/**
+		 * Quick function to retrieve the file name off the end of a URI.
+		 * 
+		 * <p>For example, if the URI is:</p>
+		 * <listing>http://something.com/some/path/to/my/file.html</listing>
+		 * <p>this function will return "file.html".</p>
+		 * 
+		 * @param minusExtension true if the file extension should be stripped
+		 * 
+		 * @return the file name.  If this URI is a directory, the return
+		 * value will be empty string.
+		 */
+		public function getFilename(minusExtension:Boolean = false) : String
+		{
+			if (isDirectory())
+				return String("");
+		
+			var pathStr:String = this.path;
+			var filename:String;
+			var index:int;
+		
+			// Find the last path separator.
+			index = pathStr.lastIndexOf("/");
+		
+			if (index != -1)
+				filename = pathStr.substr(index + 1);
+			else
+				filename = pathStr;
+		
+			if (minusExtension)
+			{
+				// The caller has requested that the extension be removed
+				index = filename.lastIndexOf(".");
+		
+				if (index != -1)
+					filename = filename.substr(0, index);
+			}
+		
+			return filename;
+		}
+		
+		
+		/**
+		 * @private
+		 * Helper function to compare strings.
+		 * 
+		 * @return true if the two strings are identical, false otherwise.
+		 */
+		static protected function compareStr(str1:String, str2:String,
+			sensitive:Boolean = true) : Boolean
+		{
+			if (sensitive == false)
+			{
+				str1 = str1.toLowerCase();
+				str2 = str2.toLowerCase();
+			}
+			
+			return (str1 == str2)
+		}
+		
+		/**
+		 * Based on the type of this URI (http, ftp, etc.) get
+		 * the default port used for that protocol.  This is
+		 * just intended to be a helper function for the most
+		 * common cases.
+		 */
+		public function getDefaultPort() : String
+		{
+			if (_scheme == "http")
+				return String("80");
+			else if (_scheme == "ftp")
+				return String("21");
+			else if (_scheme == "file")
+				return String("");
+			else if (_scheme == "sftp")
+				return String("22"); // ssh standard port
+			else
+			{
+				// Don't know the port for this URI type
+				return String("");
+			}
+		}
+		
+		/**
+		 * @private
+		 * 
+		 * This resolves the given URI if the application has a
+		 * resolver interface defined.  This function does not
+		 * modify the passed in URI and returns a new URI.
+		 */
+		static protected function resolve(uri:URI) : URI
+		{
+			var copy:URI = new URI();
+			copy.copyURI(uri);
+			
+			if (_resolver != null)
+			{
+				// A resolver class has been registered.  Call it.
+				return _resolver.resolve(copy);
+			}
+			else
+			{
+				// No resolver.  Nothing to do, but we don't
+				// want to reuse the one passed in.
+				return copy;
+			}
+		}
+		
+		/**
+		 * Accessor to set and get the resolver object used by all URI
+		 * objects to dynamically resolve URI's before comparison.
+		 */
+		static public function set resolver(resolver:IURIResolver) : void
+		{
+			_resolver = resolver;
+		}
+		static public function get resolver() : IURIResolver
+		{
+			return _resolver;
+		}
+		
+		/**
+		 * Given another URI, return this URI object's relation to the one given.
+		 * URI's can have 1 of 4 possible relationships.  They can be unrelated,
+		 * equal, parent, or a child of the given URI.
+		 * 
+		 * @param uri	URI to compare this URI object to.
+		 * @param caseSensitive  true if the URI comparison should be done
+		 * taking case into account, false if the comparison should be
+		 * performed case insensitive.
+		 * 
+		 * @return URI.NOT_RELATED, URI.CHILD, URI.PARENT, or URI.EQUAL
+		 */
+		public function getRelation(uri:URI, caseSensitive:Boolean = true) : int
+		{
+			// Give the app a chance to resolve these URI's before we compare them.
+			var thisURI:URI = URI.resolve(this);
+			var thatURI:URI = URI.resolve(uri);
+			
+			if (thisURI.isRelative() || thatURI.isRelative())
+			{
+				// You cannot compare relative URI's due to their lack of context.
+				// You could have two relative URI's that look like:
+				//		../../images/
+				//		../../images/marketing/logo.gif
+				// These may appear related, but you have no overall context
+				// from which to make the comparison.  The first URI could be
+				// from one site and the other URI could be from another site.
+				return URI.NOT_RELATED;
+			}
+			else if (thisURI.isHierarchical() == false || thatURI.isHierarchical() == false)
+			{
+				// One or both of the URI's are non-hierarchical.
+				if (((thisURI.isHierarchical() == false) && (thatURI.isHierarchical() == true)) ||
+					((thisURI.isHierarchical() == true) && (thatURI.isHierarchical() == false)))
+				{
+					// XOR.  One is hierarchical and the other is
+					// non-hierarchical.  They cannot be compared.
+					return URI.NOT_RELATED;
+				}
+				else
+				{
+					// They are both non-hierarchical
+					if (thisURI.scheme != thatURI.scheme)
+						return URI.NOT_RELATED;
+		
+					if (thisURI.nonHierarchical != thatURI.nonHierarchical)
+						return URI.NOT_RELATED;
+						
+					// The two non-hierarcical URI's are equal.
+					return URI.EQUAL;
+				}
+			}
+			
+			// Ok, this URI and the one we are being compared to are both
+			// absolute hierarchical URI's.
+		
+			if (thisURI.scheme != thatURI.scheme)
+				return URI.NOT_RELATED;
+		
+			if (thisURI.authority != thatURI.authority)
+				return URI.NOT_RELATED;
+		
+			var thisPort:String = thisURI.port;
+			var thatPort:String = thatURI.port;
+			
+			// Different ports are considered completely different servers.
+			if (thisPort == "")
+				thisPort = thisURI.getDefaultPort();
+			if (thatPort == "")
+				thatPort = thatURI.getDefaultPort();
+		
+			// Check to see if the port is the default port.
+			if (thisPort != thatPort)
+				return URI.NOT_RELATED;
+		
+			if (compareStr(thisURI.path, thatURI.path, caseSensitive))
+				return URI.EQUAL;
+		
+			// Special case check.  If we are here, the scheme, authority,
+			// and port match, and it is not a relative path, but the
+			// paths did not match.  There is a special case where we
+			// could have:
+			//		http://something.com/
+			//		http://something.com
+			// Technically, these are equal.  So lets, check for this case.
+			var thisPath:String = thisURI.path;
+			var thatPath:String = thatURI.path;
+		
+			if ( (thisPath == "/" || thatPath == "/") &&
+				 (thisPath == "" || thatPath == "") )
+			{
+				// We hit the special case.  These two are equal.
+				return URI.EQUAL;
+			}
+		
+			// Ok, the paths do not match, but one path may be a parent/child
+			// of the other.  For example, we may have:
+			//		http://something.com/path/to/homepage/
+			//		http://something.com/path/to/homepage/images/logo.gif
+			// In this case, the first is a parent of the second (or the second
+			// is a child of the first, depending on which you compare to the
+			// other).  To make this comparison, we must split the path into
+			// its component parts (split the string on the '/' path delimiter).
+			// We then compare the 
+			var thisParts:Array, thatParts:Array;
+			var thisPart:String, thatPart:String;
+			var i:int;
+		
+			thisParts = thisPath.split("/");
+			thatParts = thatPath.split("/");
+		
+			if (thisParts.length > thatParts.length)
+			{
+				thatPart = thatParts[thatParts.length - 1];
+				if (thatPart.length > 0)
+				{
+					// if the last part is not empty, the passed URI is
+					// not a directory.  There is no way the passed URI
+					// can be a parent.
+					return URI.NOT_RELATED;
+				}
+				else
+				{
+					// Remove the empty trailing part
+					thatParts.pop();
+				}
+				
+				// This may be a child of the one passed in
+				for (i = 0; i < thatParts.length; i++)
+				{
+					thisPart = thisParts[i];
+					thatPart = thatParts[i];
+						
+					if (compareStr(thisPart, thatPart, caseSensitive) == false)
+						return URI.NOT_RELATED;
+				}
+		
+				return URI.CHILD;
+			}
+			else if (thisParts.length < thatParts.length)
+			{
+				thisPart = thisParts[thisParts.length - 1];
+				if (thisPart.length > 0)
+				{
+					// if the last part is not empty, this URI is not a
+					// directory.  There is no way this object can be
+					// a parent.
+					return URI.NOT_RELATED;
+				}
+				else
+				{
+					// Remove the empty trailing part
+					thisParts.pop();
+				}
+				
+				// This may be the parent of the one passed in
+				for (i = 0; i < thisParts.length; i++)
+				{
+					thisPart = thisParts[i];
+					thatPart = thatParts[i];
+		
+					if (compareStr(thisPart, thatPart, caseSensitive) == false)
+						return URI.NOT_RELATED;
+				}
+				
+				return URI.PARENT;
+			}
+			else
+			{
+				// Both URI's have the same number of path components, but
+				// it failed the equivelence check above.  This means that
+				// the two URI's are not related.
+				return URI.NOT_RELATED;
+			}
+			
+			// If we got here, the scheme and authority are the same,
+			// but the paths pointed to two different locations that
+			// were in different parts of the file system tree
+			return URI.NOT_RELATED;
+		}
+		
+		/**
+		 * Given another URI, return the common parent between this one
+		 * and the provided URI.
+		 * 
+		 * @param uri the other URI from which to find a common parent
+		 * @para caseSensitive true if this operation should be done
+		 * with case sensitive comparisons.
+		 * 
+		 * @return the parent URI if successful, null otherwise.
+		 */
+		public function getCommonParent(uri:URI, caseSensitive:Boolean = true) : URI
+		{
+			var thisURI:URI = URI.resolve(this);
+			var thatURI:URI = URI.resolve(uri);
+		
+			if(!thisURI.isAbsolute() || !thatURI.isAbsolute() ||
+				thisURI.isHierarchical() == false ||
+				thatURI.isHierarchical() == false)
+			{
+				// Both URI's must be absolute hierarchical for this to
+				// make sense.
+				return null;
+			}
+			
+			var relation:int = thisURI.getRelation(thatURI);
+			if (relation == URI.NOT_RELATED)
+			{
+				// The given URI is not related to this one.  No
+				// common parent.
+				return null;
+			}
+		
+			thisURI.chdir(".");
+			thatURI.chdir(".");
+			
+			var strBefore:String, strAfter:String;
+			do
+			{
+				relation = thisURI.getRelation(thatURI, caseSensitive);
+				if(relation == URI.EQUAL || relation == URI.PARENT)
+					break;
+		
+				// If strBefore and strAfter end up being the same,
+				// we know we are at the root of the path because
+				// chdir("..") is doing nothing.
+				strBefore = thisURI.toString();
+				thisURI.chdir("..");
+				strAfter = thisURI.toString();
+			}
+			while(strBefore != strAfter);
+		
+			return thisURI;
+		}
+		
+		
+		/**
+		 * This function is used to move around in a URI in a way similar
+		 * to the 'cd' or 'chdir' commands on Unix.  These operations are
+		 * completely string based, using the context of the URI to
+		 * determine the position within the path.  The heuristics used
+		 * to determine the action are based off Appendix C in RFC 2396.
+		 * 
+		 * <p>URI paths that end in '/' are considered paths that point to
+		 * directories, while paths that do not end in '/' are files.  For
+		 * example, if you execute chdir("d") on the following URI's:<br/>
+		 *    1.  http://something.com/a/b/c/  (directory)<br/>
+		 *    2.  http://something.com/a/b/c  (not directory)<br/>
+		 * you will get:<br/>
+		 *    1.  http://something.com/a/b/c/d<br/>
+		 *    2.  http://something.com/a/b/d<br/></p>
+		 * 
+		 * <p>See RFC 2396, Appendix C for more info.</p>
+		 * 
+		 * @param reference	the URI or path to "cd" to.
+		 * @param escape true if the passed reference string should be URI
+		 * escaped before using it.
+		 * 
+		 * @return true if the chdir was successful, false otherwise.
+		 */
+		public function chdir(reference:String, escape:Boolean = false) : Boolean
+		{
+			var uriReference:URI;
+			var ref:String = reference;
+		
+			if (escape)
+				ref = URI.escapeChars(reference);
+		
+			if (ref == "")
+			{
+				// NOOP
+				return true;
+			}
+			else if (ref.substr(0, 2) == "//")
+			{
+				// Special case.  This is an absolute URI but without the scheme.
+				// Take the scheme from this URI and tack it on.  This is
+				// intended to make working with chdir() a little more
+				// tolerant.
+				var f:String = this.scheme + ":" + ref;
+				
+				return constructURI(f);
+			}
+			else if (ref.charAt(0) == "?")
+			{
+				// A relative URI that is just a query part is essentially
+				// a "./?query".  We tack on the "./" here to make the rest
+				// of our logic work.
+				ref = "./" + ref;
+			}
+		
+			// Parse the reference passed in as a URI.  This way we
+			// get any query and fragments parsed out as well.
+			uriReference = new URI(ref);
+		
+			if (uriReference.isAbsolute() ||
+				uriReference.isHierarchical() == false)
+			{
+				// If the URI given is a full URI, it replaces this one.
+				copyURI(uriReference);
+				return true;
+			}
+		
+		
+			var thisPath:String, thatPath:String;
+			var thisParts:Array, thatParts:Array;
+			var thisIsDir:Boolean = false, thatIsDir:Boolean = false;
+			var thisIsAbs:Boolean = false, thatIsAbs:Boolean = false;
+			var lastIsDotOperation:Boolean = false;
+			var curDir:String;
+			var i:int;
+		
+			thisPath = this.path;
+			thatPath = uriReference.path;
+		
+			if (thisPath.length > 0)
+				thisParts = thisPath.split("/");
+			else
+				thisParts = new Array();
+				
+			if (thatPath.length > 0)
+				thatParts = thatPath.split("/");
+			else
+				thatParts = new Array();
+			
+			if (thisParts.length > 0 && thisParts[0] == "")
+			{
+				thisIsAbs = true;
+				thisParts.shift(); // pop the first one off the array
+			}
+			if (thisParts.length > 0 && thisParts[thisParts.length - 1] == "")
+			{
+				thisIsDir = true;
+				thisParts.pop();  // pop the last one off the array
+			}
+				
+			if (thatParts.length > 0 && thatParts[0] == "")
+			{
+				thatIsAbs = true;
+				thatParts.shift(); // pop the first one off the array
+			}
+			if (thatParts.length > 0 && thatParts[thatParts.length - 1] == "")
+			{
+				thatIsDir = true;
+				thatParts.pop();  // pop the last one off the array
+			}
+				
+			if (thatIsAbs)
+			{
+				// The reference is an absolute path (starts with a slash).
+				// It replaces this path wholesale.
+				this.path = uriReference.path;
+		
+				// And it inherits the query and fragment
+				this.queryRaw = uriReference.queryRaw;
+				this.fragment = uriReference.fragment;
+		
+				return true;
+			}
+			else if (thatParts.length == 0 && uriReference.query == "")
+			{
+				// The reference must have only been a fragment.  Fragments just
+				// get appended to whatever the current path is.  We don't want
+				// to overwrite any query that may already exist, so this case
+				// only takes on the new fragment.
+				this.fragment = uriReference.fragment;
+				return true;
+			}
+			else if (thisIsDir == false && thisParts.length > 0)
+			{
+				// This path ends in a file.  It goes away no matter what.
+				thisParts.pop();
+			}
+		
+			// By default, this assumes the query and fragment of the reference
+			this.queryRaw = uriReference.queryRaw;
+			this.fragment = uriReference.fragment;
+		
+			// Append the parts of the path from the passed in reference
+			// to this object's path.
+			thisParts = thisParts.concat(thatParts);
+					
+			for(i = 0; i < thisParts.length; i++)
+			{
+				curDir = thisParts[i];
+				lastIsDotOperation = false;
+		
+				if (curDir == ".")
+				{
+					thisParts.splice(i, 1);
+					i = i - 1;  // account for removing this item
+					lastIsDotOperation = true;
+				}
+				else if (curDir == "..")
+				{
+					if (i >= 1)
+					{
+						if (thisParts[i - 1] == "..")
+						{
+							// If the previous is a "..", we must have skipped
+							// it due to this URI being relative.  We can't
+							// collapse leading ".."s in a relative URI, so
+							// do nothing.
+						}
+						else
+						{
+							thisParts.splice(i - 1, 2);
+							i = i - 2;  // move back to account for the 2 we removed
+						}
+					}
+					else
+					{
+						// This is the first thing in the path.
+		
+						if (isRelative())
+						{
+							// We can't collapse leading ".."s in a relative
+							// path.  Do noting.
+						}
+						else
+						{
+							// This is an abnormal case.  We have dot-dotted up
+							// past the base of our "file system".  This is a
+							// case where we had a /path/like/this.htm and were
+							// given a path to chdir to like this:
+							// ../../../../../../mydir
+							// Obviously, it has too many ".." and will take us
+							// up beyond the top of the URI.  However, according
+							// RFC 2396 Appendix C.2, we should try to handle
+							// these abnormal cases appropriately.  In this case,
+							// we will do what UNIX command lines do if you are
+							// at the root (/) of the filesystem and execute:
+							// # cd ../../../../../bin
+							// Which will put you in /bin.  Essentially, the extra
+							// ".."'s will just get eaten.
+		
+							thisParts.splice(i, 1);
+							i = i - 1;  // account for the ".." we just removed
+						}
+					}
+		
+					lastIsDotOperation = true;
+				}
+			}
+			
+			var finalPath:String = "";
+		
+			// If the last thing in the path was a "." or "..", then this thing is a
+			// directory.  If the last thing isn't a dot-op, then we don't want to 
+			// blow away any information about the directory (hence the "|=" binary
+			// assignment).
+			thatIsDir = thatIsDir || lastIsDotOperation;
+		
+			// Reconstruct the path with the abs/dir info we have
+			finalPath = joinPath(thisParts, thisIsAbs, thatIsDir);
+		
+			// Set the path (automatically escaping it)
+			this.path = finalPath;
+		
+			return true;
+		}
+		
+		/**
+		 * @private
+		 * Join an array of path parts back into a URI style path string.
+		 * This is used by the various path logic functions to recombine
+		 * a path.  This is different than the standard Array.join()
+		 * function because we need to take into account the starting and
+		 * ending path delimiters if this is an absolute path or a
+		 * directory.
+		 * 
+		 * @param parts	the Array that contains strings of each path part.
+		 * @param isAbs		true if the given path is absolute
+		 * @param isDir		true if the given path is a directory
+		 * 
+		 * @return the combined path string.
+		 */
+		protected function joinPath(parts:Array, isAbs:Boolean, isDir:Boolean) : String
+		{
+			var pathStr:String = "";
+			var i:int;
+		
+			for (i = 0; i < parts.length; i++)
+			{
+				if (pathStr.length > 0)
+					pathStr += "/";
+		
+				pathStr += parts[i];
+			}
+		
+			// If this path is a directory, tack on the directory delimiter,
+			// but only if the path contains something.  Adding this to an
+			// empty path would make it "/", which is an absolute path that
+			// starts at the root.
+			if (isDir && pathStr.length > 0)
+				pathStr += "/";
+		
+			if (isAbs)
+				pathStr = "/" + pathStr;
+		
+			return pathStr;
+		}
+		
+		/**
+		 * Given an absolute URI, make this relative URI absolute using
+		 * the given URI as a base.  This URI instance must be relative
+		 * and the base_uri must be absolute.
+		 * 
+		 * @param base_uri	URI to use as the base from which to make
+		 * this relative URI into an absolute URI.
+		 * 
+		 * @return true if successful, false otherwise.
+		 */
+		public function makeAbsoluteURI(base_uri:URI) : Boolean
+		{
+			if (isAbsolute() || base_uri.isRelative())
+			{
+				// This URI needs to be relative, and the base needs to be
+				// absolute otherwise we won't know what to do!
+				return false;
+			}
+		
+			// Make a copy of the base URI.  We don't want to modify
+			// the passed URI.
+			var base:URI = new URI();
+			base.copyURI(base_uri);
+		
+			// ChDir on the base URI.  This will preserve any query
+			// and fragment we have.
+			if (base.chdir(toString()) == false)
+				return false;
+		
+			// It worked, so copy the base into this one
+			copyURI(base);
+		
+			return true;
+		}
+		
+		
+		/**
+		 * Given a URI to use as a base from which this object should be
+		 * relative to, convert this object into a relative URI.  For example,
+		 * if you have:
+		 * 
+		 * <listing>
+		 * var uri1:URI = new URI("http://something.com/path/to/some/file.html");
+		 * var uri2:URI = new URI("http://something.com/path/to/another/file.html");
+		 * 
+		 * uri1.MakeRelativePath(uri2);</listing>
+		 * 
+		 * <p>uri1 will have a final value of "../some/file.html"</p>
+		 * 
+		 * <p>Note! This function is brute force.  If you have two URI's
+		 * that are completely unrelated, this will still attempt to make
+		 * the relative URI.  In that case, you will most likely get a
+		 * relative path that looks something like:</p>
+		 * 
+		 * <p>../../../../../../some/path/to/my/file.html</p>
+		 * 
+		 * @param base_uri the URI from which to make this URI relative
+		 * 
+		 * @return true if successful, false if the base_uri and this URI
+		 * are not related, of if error.
+		 */
+		public function makeRelativeURI(base_uri:URI, caseSensitive:Boolean = true) : Boolean
+		{
+			var base:URI = new URI();
+			base.copyURI(base_uri);
+			
+			var thisParts:Array, thatParts:Array;
+			var finalParts:Array = new Array();
+			var thisPart:String, thatPart:String, finalPath:String;
+			var pathStr:String = this.path;
+			var queryStr:String = this.queryRaw;
+			var fragmentStr:String = this.fragment;
+			var i:int;
+			var diff:Boolean = false;
+			var isDir:Boolean = false;
+		
+			if (isRelative())
+			{
+				// We're already relative.
+				return true;
+			}
+		
+			if (base.isRelative())
+			{
+				// The base is relative.  A relative base doesn't make sense.
+				return false;
+			}
+		
+		
+			if ( (isOfType(base_uri.scheme) == false) ||
+				(this.authority != base_uri.authority) )
+			{
+				// The schemes and/or authorities are different.  We can't
+				// make a relative path to something that is completely
+				// unrelated.
+				return false;
+			}
+		
+			// Record the state of this URI
+			isDir = isDirectory();
+		
+			// We are based of the directory of the given URI.  We need to
+			// make sure the URI is pointing to a directory.  Changing
+			// directory to "." will remove any file name if the base is
+			// not a directory.
+			base.chdir(".");
+		
+			thisParts = pathStr.split("/");
+			thatParts = base.path.split("/");
+			
+			if (thisParts.length > 0 && thisParts[0] == "")
+				thisParts.shift();
+			
+			if (thisParts.length > 0 && thisParts[thisParts.length - 1] == "")
+			{
+				isDir = true;
+				thisParts.pop();
+			}
+			
+			if (thatParts.length > 0 && thatParts[0] == "")
+				thatParts.shift();
+			if (thatParts.length > 0 && thatParts[thatParts.length - 1] == "")
+				thatParts.pop();
+		
+		
+			// Now that we have the paths split into an array of directories,
+			// we can compare the two paths.  We start from the left of side
+			// of the path and start comparing.  When we either run out of
+			// directories (one path is longer than the other), or we find
+			// a directory that is different, we stop.  The remaining parts
+			// of each path is then used to determine the relative path.  For
+			// example, lets say we have:
+			//    path we want to make relative: /a/b/c/d/e.txt
+			//    path to use as base for relative: /a/b/f/
+			//
+			// This loop will start at the left, and remove directories
+			// until we get a mismatch or run off the end of one of them.
+			// In this example, the result will be:
+			//    c/d/e.txt
+			//    f
+			//
+			// For every part left over in the base path, we prepend a ".."
+			// to the relative to get the final path:
+			//   ../c/d/e.txt
+			while(thatParts.length > 0)
+			{
+				if (thisParts.length == 0)
+				{
+					// we matched all there is to match, we are done.
+					// This is the case where "this" object is a parent
+					// path of the given URI.  eg:
+					//   this.path = /a/b/				(thisParts)
+					//   base.path = /a/b/c/d/e/		(thatParts)
+					break;
+				}
+		
+				thisPart = thisParts[0];
+				thatPart = thatParts[0];
+		
+				if (compareStr(thisPart, thatPart, caseSensitive))
+				{
+					thisParts.shift();
+					thatParts.shift();
+				}
+				else
+					break;
+			}
+		
+			// If there are any path info left from the base URI, that means
+			// **this** object is above the given URI in the file tree.  For
+			// each part left over in the given URI, we need to move up one
+			// directory to get where we are.
+			var dotdot:String = "..";
+			for (i = 0; i < thatParts.length; i++)
+			{
+				finalParts.push(dotdot);
+			}
+		
+			// Append the parts of this URI to any dot-dot's we have
+			finalParts = finalParts.concat(thisParts);
+		
+			// Join the parts back into a path
+			finalPath = joinPath(finalParts, false /* not absolute */, isDir);
+		
+			if (finalPath.length == 0)
+			{
+				// The two URI's are exactly the same.  The proper relative
+				// path is:
+				finalPath = "./";
+			}
+		
+			// Set the parts of the URI, preserving the original query and
+			// fragment parts.
+			setParts("", "", "", finalPath, queryStr, fragmentStr);
+		
+			return true;
+		}
+		
+		/**
+		 * Given a string, convert it to a URI.  The string could be a
+		 * full URI that is improperly escaped, a malformed URI (e.g.
+		 * missing a protocol like "www.something.com"), a relative URI,
+		 * or any variation there of.
+		 * 
+		 * <p>The intention of this function is to take anything that a
+		 * user might manually enter as a URI/URL and try to determine what
+		 * they mean.  This function differs from the URI constructor in
+		 * that it makes some assumptions to make it easy to import user
+		 * entered URI data.</p>
+		 * 
+		 * <p>This function is intended to be a helper function.
+		 * It is not all-knowning and will probably make mistakes
+		 * when attempting to parse a string of unknown origin.  If
+		 * your applicaiton is receiving input from the user, your
+		 * application should already have a good idea what the user
+		 * should  be entering, and your application should be
+		 * pre-processing the user's input to make sure it is well formed
+		 * before passing it to this function.</p>
+		 * 
+		 * <p>It is assumed that the string given to this function is
+		 * something the user may have manually entered.  Given this,
+		 * the URI string is probably unescaped or improperly escaped.
+		 * This function will attempt to properly escape the URI by
+		 * using forceEscape().  The result is that a toString() call
+		 * on a URI that was created from unknownToURI() may not match
+		 * the input string due to the difference in escaping.</p>
+		 *
+		 * @param unknown	a potental URI string that should be parsed
+		 * and loaded into this object.
+		 * @param defaultScheme	if it is determined that the passed string
+		 * looks like a URI, but it is missing the scheme part, this
+		 * string will be used as the missing scheme.
+		 * 
+		 * @return	true if the given string was successfully parsed into
+		 * a valid URI object, false otherwise.
+		 */
+		public function unknownToURI(unknown:String, defaultScheme:String = "http") : Boolean
+		{
+			var temp:String;
+			
+			if (unknown.length == 0)
+			{
+				this.initialize();
+				return false;
+			}
+			
+			// Some users love the backslash key.  Fix it.
+			unknown = unknown.replace(/\\/g, "/");
+			
+			// Check for any obviously missing scheme.
+			if (unknown.length >= 2)
+			{
+				temp = unknown.substr(0, 2);
+				if (temp == "//")
+					unknown = defaultScheme + ":" + unknown;
+			}
+			
+			if (unknown.length >= 3)
+			{
+				temp = unknown.substr(0, 3);
+				if (temp == "://")
+					unknown = defaultScheme + unknown;
+			}
+
+			// Try parsing it as a normal URI
+			var uri:URI = new URI(unknown);
+		
+			if (uri.isHierarchical() == false)
+			{
+				if (uri.scheme == UNKNOWN_SCHEME)
+				{
+					this.initialize();
+					return false;
+				}
+		
+				// It's a non-hierarchical URI
+				copyURI(uri);
+				forceEscape();
+				return true;
+			}
+			else if ((uri.scheme != UNKNOWN_SCHEME) &&
+				(uri.scheme.length > 0))
+			{
+				if ( (uri.authority.length > 0) ||
+					(uri.scheme == "file") )
+				{
+					// file://... URI
+					copyURI(uri);
+					forceEscape();  // ensure proper escaping
+					return true;
+				}
+				else if (uri.authority.length == 0 && uri.path.length == 0)
+				{
+					// It's is an incomplete URI (eg "http://")
+					
+					setParts(uri.scheme, "", "", "", "", "");
+					return false;
+				}
+			}
+			else
+			{
+				// Possible relative URI.  We can only detect relative URI's
+				// that start with "." or "..".  If it starts with something
+				// else, the parsing is ambiguous.
+				var path:String = uri.path;
+		
+				if (path == ".." || path == "." || 
+					(path.length >= 3 && path.substr(0, 3) == "../") ||
+					(path.length >= 2 && path.substr(0, 2) == "./") )
+				{
+					// This is a relative URI.
+					copyURI(uri);
+					forceEscape();
+					return true;
+				}
+			}
+		
+			// Ok, it looks like we are just a normal URI missing the scheme.  Tack
+			// on the scheme.
+			uri = new URI(defaultScheme + "://" + unknown);
+		
+			// Check to see if we are good now
+			if (uri.scheme.length > 0 && uri.authority.length > 0)
+			{
+				// It was just missing the scheme.
+				copyURI(uri);
+				forceEscape();  // Make sure we are properly encoded.
+				return true;
+			}
+		
+			// don't know what this is
+			this.initialize();
+			return false;
+		}
+		
+	} // end URI class
+} // end package