comparison data/fileio/SparqlRelatedMediaReader.cpp @ 143:97fd6148fb8e

support related media display and loading

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*	Sound Access	
+		EASAIER client application.	
+		Silogic 2007. Laure Bajard. 
+	
+	This program is free software; you can redistribute it and/or    
+	modify it under the terms of the GNU General Public License as    
+	published by the Free Software Foundation; either version 2 of the    
+	License, or (at your option) any later version.  See the file    
+	COPYING included with this distribution for more information.
+*/
+
+#include "SparqlRelatedMediaReader.h"
+
+#include <iostream>
+
+SparqlRelatedMediaReader::SparqlRelatedMediaReader(std::list<QString> *relMediaList) : 
+	m_relMediaList(relMediaList)
+{}
+
+bool SparqlRelatedMediaReader::parse(const QString & filename)
+{
+	SparqlRelatedMediaHandler handler(m_relMediaList);
+    QXmlSimpleReader reader;
+    reader.setContentHandler(&handler);
+    reader.setErrorHandler(&handler);
+
+	QFile file(filename);
+
+    if (!file.open(QFile::ReadOnly | QFile::Text)) {
+        return false;
+    }
+
+    QXmlInputSource xmlInputSource(&file);
+    if (reader.parse(xmlInputSource))
+	{
+		return true;
+	}
+	
+	return false;
+}
+
+SparqlRelatedMediaHandler::SparqlRelatedMediaHandler(std::list<QString> *relMediaList) : QXmlDefaultHandler(),
+	m_relMediaList(relMediaList),
+	m_inBinding(false),
+	m_curBindingName("")
+{}
+
+bool SparqlRelatedMediaHandler::startElement(const QString &namespaceURI, const QString &localName,
+						  const QString &qName, const QXmlAttributes &attributes)
+{
+	
+    QString name = qName.toLower();
+
+    bool ok = false;
+
+    // Valid element names:
+    //
+    // sparql
+    // head
+    // variable
+    // results
+	// result
+	// binding
+    
+    if (name == "sparql") {
+
+		// nothing needed
+		ok = true;
+
+    } else if (name == "head") {
+
+		// nothing needed
+		ok = true;
+
+    } else if (name == "variable") {
+
+		// nothing needed
+		ok = true;
+    
+    } else if (name == "results") {
+	
+		// nothing needed
+		ok = true;
+
+    } else if (name == "result") {
+	
+		// nothing needed
+		ok = true;
+
+    } else if (name == "binding") {
+	
+		// nothing needed
+		ok = true;
+
+    } else if ( (name == "uri") || (name == "literal") ) {
+		m_inBinding = true;	
+		ok = true;
+	}
+
+    if (!ok) {
+		std::cerr << "WARNING: SparqlResultsHandler-XML: Failed to completely process element \""
+		  << name.toLocal8Bit().data() << "\"" << std::endl;
+    }
+
+    return true;
+}
+
+bool SparqlRelatedMediaHandler::endElement(const QString &namespaceURI, const QString &localName,
+						const QString &qName)
+{
+	QString name = qName.toLower();
+
+	if ( (name == "uri") || (name == "literal") )
+	{
+		m_inBinding = false;
+	}
+
+	return true;
+}
+
+bool SparqlRelatedMediaHandler::characters(const QString &str)
+{
+	if (m_inBinding)
+	{
+		m_relMediaList->push_back(str);
+	}
+
+    return true;
+}
+
+bool SparqlRelatedMediaHandler::error(const QXmlParseException &exception)
+{
+	QString errorString;
+	errorString += QString("ERROR: SparqlRelatedMediaHandler-XML: %1 at line %2, column %3")
+	.arg(exception.message())
+	.arg(exception.lineNumber())
+	.arg(exception.columnNumber());
+    std::cerr << errorString.toLocal8Bit().data() << std::endl;
+    return QXmlDefaultHandler::error(exception);
+}
+
+bool SparqlRelatedMediaHandler::fatalError(const QXmlParseException &exception)
+{
+	QString errorString;
+	errorString += QString("FATAL ERROR: SparqlRelatedMediaHandler-XML: %1 at line %2, column %3")
+	.arg(exception.message())
+	.arg(exception.lineNumber())
+	.arg(exception.columnNumber());
+    std::cerr << errorString.toLocal8Bit().data() << std::endl;
+    return QXmlDefaultHandler::fatalError(exception);
+}