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/*******************************************************************************
* Copyright (c) 2003, 2005 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.common.internal.emf.resource;
import java.io.IOException;
import org.eclipse.jem.util.logger.proxy.Logger;
import org.xml.sax.Attributes;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
/**
* The EMF2SAXDocumentHandler is utilized by the SAX parser to announce XML Events, such as
* beginning and end of XML elements and the contents of those elements.
*
* @author mdelder
*/
public class EMF2SAXDocumentHandler extends DefaultHandler {
private TranslatorResource resource = null;
private final CacheEventStack eventStack = new CacheEventStack();
private CacheEventPool availableEventPool = new CacheEventPool();
/**
* Create an EMF2SAXDocumentHandler to populate the given resource.
*
*/
public EMF2SAXDocumentHandler(TranslatorResource resource) {
this.resource = resource;
}
/**
* @see org.xml.sax.helpers.DefaultHandler#resolveEntity(java.lang.String, java.lang.String)
*/
public InputSource resolveEntity(String publicId, String systemId) throws SAXException {
InputSource result = null;
this.resource.setDoctypeValues(publicId, systemId);
try {
EntityResolver entityResolver = this.resource.getEntityResolver();
if (entityResolver != null)
result = entityResolver.resolveEntity(publicId, systemId);
else
result = super.resolveEntity(publicId, systemId);
} catch (IOException ioe) {
throw new SAXException(ioe);
}
return result;
}
/**
* @see org.xml.sax.ContentHandler#startDocument()
*/
public void startDocument() throws SAXException {
/*
* The endDocument() method should have frozen the pool, or it may not be warmed yet. In
* either case, this method call will do as little work as necessary
*/
availableEventPool.warmPool();
/* This line should not be necessary, but is left for safty */
eventStack.clear();
this.createRoot(this.resource);
}
/**
* @see org.xml.sax.ContentHandler#startElement(java.lang.String, java.lang.String,
* java.lang.String, org.xml.sax.Attributes)
*/
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
addToStack(qName, attributes);
}
/**
* @see org.xml.sax.ContentHandler#characters(char[], int, int)
*/
public void characters(char[] data, int start, int length) throws SAXException {
CacheEventNode currentRecord = getCurrentRecord();
if (currentRecord != null) {
currentRecord.appendToBuffer(data, start, length);
}
}
/**
* @see org.xml.sax.ContentHandler#endElement(java.lang.String, java.lang.String,
* java.lang.String)
*/
public void endElement(String uri, String localName, String qName) throws SAXException {
CacheEventNode currentRecord = null;
/*
* This should only happen in the case where the DOMPath was ignored so the stack does not
* quite match with the XML data structure. In this case we do nothing
*/
if (qName.equals(this.getCurrentRecord().getNodeName())) {
currentRecord = this.removeCurrentRecord();
if (currentRecord != null) {
currentRecord.commit();
}
}
}
/**
* @see org.xml.sax.ContentHandler#endDocument()
*/
public void endDocument() throws SAXException {
CacheEventNode lastRecord = this.removeCurrentRecord();
lastRecord.commit();
availableEventPool.freezePool();
}
/**
* @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)
*/
public void error(SAXParseException ex) throws SAXException {
throw ex;
}
/**
* @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
*/
public void fatalError(SAXParseException ex) throws SAXException {
throw ex;
}
/**
* @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)
*/
public void warning(SAXParseException ex) throws SAXException {
Logger.getLogger().logWarning(ex);
}
/**
* @return
*/
public TranslatorResource getResource() {
return resource;
}
protected void createRoot(TranslatorResource resourceArg) {
this.eventStack.push(availableEventPool.createCacheEventNode(resourceArg));
}
protected void addToStack(String nodeName, Attributes attributes) {
CacheEventNode parent = this.getCurrentRecord();
if (!parent.isChildIgnorable(nodeName)) {
this.eventStack.push(availableEventPool.createCacheEventNode(parent, nodeName, attributes));
}
}
/**
* Return the current CENO without removing it from the event stack.
*
* @return the current CENO without removing it
*/
protected CacheEventNode getCurrentRecord() {
CacheEventNode result = null;
if (!this.eventStack.isEmpty()) {
result = this.eventStack.peek();
}
return result;
}
/**
* Return the current CENO and remove it from the event stack.
*
* @return the current CENO and remove it
*/
protected CacheEventNode removeCurrentRecord() {
CacheEventNode result = null;
if (!this.eventStack.isEmpty()) {
result = this.eventStack.pop();
}
return result;
}
// private final void printStack() {
// // System.out.println("Printing stack ...");
// // for (int i = 0; i < this.eventStack.size(); i++) {
// // debug("stack[" + i + "]: " + eventStack.get(i));
// // }
// // System.out.println("... Printed stack");
// }
//
// private final static void debug(Object obj) {
// // System.out.println(obj);
// }
//
// private final static void warn(Object obj) {
// //System.err.println(obj);
// }
}
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