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/**
* *******************************************************************************
* Copyright (c) 2009 Mia-Software.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
*
* Fabien Giquel (Mia-Software) - initial API and implementation
* *******************************************************************************
*
*/
package org.eclipse.papyrus.views.properties.model.xwt.modisco;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Attribute;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Comment;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.DocumentTypeDeclaration;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Element;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Namespace;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.ProcessingInstruction;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Root;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Text;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.XwtxmlFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;
import org.xml.sax.helpers.DefaultHandler;
import com.ibm.icu.lang.UCharacter;
/**
* A handler for reading xml files and instanciating a generic xml model.
*/
public class GenericXMLHandler extends DefaultHandler implements LexicalHandler {
/**
* Prefix for namespace attributes.
*/
public static final String XMLNS = "xmlns"; //$NON-NLS-1$
/** A parameter key for indicating to ignore whitespace in text portions. */
public static final String OPTION_IGNORE_WHITESPACE = "OPTION_IGNORE_WHITESPACE"; //$NON-NLS-1$
/**
* A parameter key for indicating to minimize the memory size of obtained
* model. If set to true : comments are ignored, text portions with only
* indentation and line delimiters are ignored.
*/
public static final String OPTION_LIGHTWEIGHT_MODEL = "OPTION_LIGHTWEIGHT_MODEL"; //$NON-NLS-1$
private final Map<String, Object> parameters;
private final Resource container;
private Root root;
private Element current;
private DocumentTypeDeclaration dtd;
private boolean nextIsCDATA = false;
private List<ProcessingInstruction> leadingPIs = null;
private Boolean ignoreWhiteSpace = null;
private Boolean lightweightModel = null;
/**
* Constructor for GenericXMLHandler.
*
* @param resource
* the model container.
*/
public GenericXMLHandler(final Resource resource, final Map<String, Object> options) {
this.container = resource;
this.parameters = options;
}
@Override
public final void startElement(final String uri, final String localName, final String qName, final Attributes attrs) throws SAXException {
if (this.root == null) {
this.root = XwtxmlFactory.eINSTANCE.createRoot();
this.root.setName(qName);
this.container.getContents().add(this.root);
this.current = this.root;
if (this.dtd != null) {
this.root.setDtd(this.dtd);
}
if (this.leadingPIs != null) {
this.root.getLeadingPIs().addAll(this.leadingPIs);
}
} else {
Element newElement = XwtxmlFactory.eINSTANCE.createElement();
newElement.setName(qName);
this.current.getChildren().add(newElement);
this.current = newElement;
}
for (int i = 0; i < attrs.getLength(); i++) {
String name = attrs.getQName(i);
if (this.current == this.root && name.startsWith(GenericXMLHandler.XMLNS)) {
Namespace newNamespace = XwtxmlFactory.eINSTANCE.createNamespace();
if (name.length() == GenericXMLHandler.XMLNS.length()) {
newNamespace.setName(""); // xmlns= //$NON-NLS-1$
} else {
newNamespace.setName(name.substring(GenericXMLHandler.XMLNS.length() + 1));
// xmlns:XX=
}
newNamespace.setValue(attrs.getValue(i));
this.root.getNamespaces().add(newNamespace);
} else {
Attribute newAttribute = XwtxmlFactory.eINSTANCE.createAttribute();
newAttribute.setName(name);
newAttribute.setValue(attrs.getValue(i));
this.current.getChildren().add(newAttribute);
}
}
}
@Override
public final void endElement(final String uri, final String localName, final String qName) throws SAXException {
this.current = this.current.getParent();
}
@Override
public final void characters(final char[] ch, final int start, final int length) throws SAXException {
if (this.current != null) {
boolean hasContent = true;
if (isLightweightModel()) {
hasContent = false;
int index = start;
while (!hasContent && index < start + length) {
hasContent = !UCharacter.isWhitespace(ch[index]);
index++;
}
}
if (hasContent) {
String text = new String(ch, start, length);
if (isIgnoreWhitespace()) {
text = text.trim();
}
if (text.length() > 0) {
Text newElement;
if (this.nextIsCDATA) {
newElement = XwtxmlFactory.eINSTANCE.createCDATA();
} else {
newElement = XwtxmlFactory.eINSTANCE.createText();
}
newElement.setName(text);
this.current.getChildren().add(newElement);
}
}
}
}
@Override
public final void comment(final char[] ch, final int start, final int length) throws SAXException {
if (this.current != null && !isLightweightModel()) {
String text = new String(ch, start, length);
if (text.length() > 0) {
Comment newElement = XwtxmlFactory.eINSTANCE.createComment();
newElement.setName(text);
this.current.getChildren().add(newElement);
}
}
}
@Override
public final void startDTD(final String name, final String publicId, final String systemId) throws SAXException {
DocumentTypeDeclaration newDtd = XwtxmlFactory.eINSTANCE.createDocumentTypeDeclaration();
newDtd.setName(name);
newDtd.setPublicID(publicId);
newDtd.setSystemID(systemId);
this.dtd = newDtd;
if (this.root != null) {
this.root.setDtd(this.dtd);
}
}
private boolean isIgnoreWhitespace() {
if (this.ignoreWhiteSpace == null) {
if (this.parameters != null && this.parameters.get(GenericXMLHandler.OPTION_IGNORE_WHITESPACE) != null) {
this.ignoreWhiteSpace = (Boolean) this.parameters.get(GenericXMLHandler.OPTION_IGNORE_WHITESPACE);
} else {
this.ignoreWhiteSpace = false;
}
}
return this.ignoreWhiteSpace;
}
private boolean isLightweightModel() {
if (this.lightweightModel == null) {
if (this.parameters != null && this.parameters.get(GenericXMLHandler.OPTION_LIGHTWEIGHT_MODEL) != null) {
this.lightweightModel = (Boolean) this.parameters.get(GenericXMLHandler.OPTION_LIGHTWEIGHT_MODEL);
} else {
this.lightweightModel = false;
}
}
return this.lightweightModel;
}
@Override
public final void endCDATA() throws SAXException {
this.nextIsCDATA = false;
}
@Override
public final void processingInstruction(final String target, final String data) throws SAXException {
ProcessingInstruction newElement = XwtxmlFactory.eINSTANCE.createProcessingInstruction();
newElement.setName(target);
newElement.setData(data);
if (this.current != null) {
this.current.getChildren().add(newElement);
} else {
if (this.leadingPIs == null) {
this.leadingPIs = new ArrayList<ProcessingInstruction>();
}
this.leadingPIs.add(newElement);
}
}
@Override
public void endDTD() throws SAXException {
// nothing
}
@Override
public void endEntity(final String arg0) throws SAXException {
// nothing
}
@Override
public final void startCDATA() throws SAXException {
this.nextIsCDATA = true;
}
@Override
public void startEntity(final String arg0) throws SAXException {
// nothing
}
}
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