samer@0: package	samer.core.util;
samer@0: import	samer.core.*;
samer@0: 
samer@0: 
samer@0: public class HashMap extends Environment
samer@0: {
samer@0: 	java.util.HashMap	map=new java.util.HashMap();
samer@0: 
samer@0: 	public HashMap(Environment parent) { super(parent,parent.node()); }
samer@0: 	public HashMap(Environment parent, String name) {
samer@0: 		super(parent,new Node(name,parent.node()));
samer@0: 	}	
samer@0: 
samer@0: 	protected class Entry implements Binding
samer@0: 	{
samer@0: 		String	nm;
samer@0: 		Object	vl;
samer@0: 		int		sc;
samer@0: 
samer@0: 		Entry(String n, Object v, int s) { nm=n; vl=v; sc=s; }
samer@0: 
samer@0: 		public String  name() { return abs(nm); } 
samer@0: 		public int		score() { return sc; }
samer@0: 
samer@0: 		public Object	get() { return vl; }
samer@0: 		public Object	get(Codec c, Object def) { return c.decode(vl); }
samer@0: 		public void		get(Autocoder obj) { obj.decode(vl); }
samer@0: 
samer@0: 		public void		set(Object obj) { map.put(nm,obj); }
samer@0: 		public void		remove() { map.remove(nm); }
samer@0: 	}
samer@0: 
samer@0: 	public Binding add(String name, Object value) 
samer@0: 	{
samer@0: 		// check for existing value??
samer@0: 		if (belongs(name)) {
samer@0: 			String key=rel(name);
samer@0: 			map.put(key,value);
samer@0: 			return new Entry(key,value,0);
samer@0: 		} else return super.add(name,value);
samer@0: 	}
samer@0: 
samer@0: 	public Datum datum(String name) 
samer@0: 	{
samer@0: 		Binding local=localFind(rel(name)); // localised name
samer@0: 		if (local.score()>0) { 
samer@0: 			// if match is less than perfect, get parent's best match
samer@0: 			Datum inherited=parent.datum(abs(name));
samer@0: 			if (inherited.score()<local.score()) return inherited;
samer@0: 		}
samer@0: 		return local;
samer@0: 	}
samer@0: 
samer@0: 	public Binding binding(String name) 
samer@0: 	{
samer@0: 		Binding local=localFind(rel(name)); // localised name
samer@0: 
samer@0: 		if (local.score()>0) { 
samer@0: 			// if match is less than perfect, get parent's best match
samer@0: 			Binding inherited=parent.binding(abs(name));
samer@0: 			if (inherited.score()<local.score()) return inherited;
samer@0: 		}
samer@0: 		return local;
samer@0: 	}
samer@0: 
samer@0: 	public Iterator data()
samer@0: 	{
samer@0: 		return new CompoundIterator(
samer@0: 			new Iterator() {
samer@0: 				java.util.Iterator it=map.entrySet().iterator();
samer@0: 				public boolean hasNext() { return it.hasNext(); }
samer@0: 				public Datum   next() {
samer@0: 					java.util.Map.Entry entry=(java.util.Map.Entry)it.next();
samer@0: 					return new Entry((String)entry.getKey(),entry.getValue(),0);
samer@0: 				}
samer@0: 			},
samer@0: 			parent.data()
samer@0: 		);
samer@0: 	}
samer@0: 	
samer@0: 	protected Binding localFind(String key) 
samer@0: 	{
samer@0: 		String	pname = '.'+key;
samer@0: 
samer@0: 		for (int i=0, s=0; i>=0; s++) {
samer@0: 			pname = pname.substring(i+1);
samer@0: 			Object val=map.get(pname); 
samer@0: 			if (val!=null) return new Entry(pname,val,s);
samer@0: 			i = pname.indexOf('.');
samer@0: 		}
samer@0: 		return Null;
samer@0: 	}
samer@0: }
samer@0: