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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER | |
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* Copyright 2008, 2010 Oracle and/or its affiliates. All rights reserved. | |
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* Use is subject to license terms. | |
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not | |
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* Unless required by applicable law or agreed to in writing, software | |
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package org.odftoolkit.odfdom.pkg; | |
import java.io.IOException; | |
import java.util.Stack; | |
import org.odftoolkit.odfdom.pkg.rdfa.JenaSink; | |
import org.w3c.dom.Element; | |
import org.w3c.dom.Node; | |
import org.w3c.dom.Text; | |
import org.xml.sax.Attributes; | |
import org.xml.sax.ContentHandler; | |
import org.xml.sax.InputSource; | |
import org.xml.sax.SAXException; | |
import org.xml.sax.helpers.DefaultHandler; | |
public class OdfFileSaxHandler extends DefaultHandler { | |
private static final String EMPTY_STRING = ""; | |
// the empty XML file to which nodes will be added | |
private OdfFileDom mFileDom; | |
// the context node | |
private Node mNode; // a stack of sub handlers. handlers will be pushed on the stack whenever | |
// they are required and must pop themselves from the stack when done | |
private Stack<ContentHandler> mHandlerStack = new Stack<ContentHandler>(); | |
private StringBuilder mCharsForTextNode = new StringBuilder(); | |
private JenaSink sink; | |
OdfFileSaxHandler(Node rootNode) { | |
if (rootNode instanceof OdfFileDom) { | |
mFileDom = (OdfFileDom) rootNode; | |
} else { | |
mFileDom = (OdfFileDom) rootNode.getOwnerDocument(); | |
} | |
mNode = rootNode; | |
} | |
@Override | |
public void startDocument() throws SAXException { | |
} | |
@Override | |
public void endDocument() throws SAXException { | |
} | |
@Override | |
public void endElement(String uri, String localName, String qName) throws SAXException { | |
flushTextNode(); | |
// pop to the parent node | |
mNode = mNode.getParentNode(); | |
} | |
@Override | |
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { | |
flushTextNode(); | |
// if there is a specilized handler on the stack, dispatch the event | |
Element element = null; | |
if (uri.equals(EMPTY_STRING) || qName.equals(EMPTY_STRING)) { | |
element = mFileDom.createElement(localName); | |
} else { | |
element = mFileDom.createElementNS(uri, qName); | |
} | |
String attrQname = null; | |
String attrURL = null; | |
OdfAttribute attr = null; | |
for (int i = 0; i < attributes.getLength(); i++) { | |
attrURL = attributes.getURI(i); | |
attrQname = attributes.getQName(i); | |
// if no namespace exists | |
if (attrURL.equals(EMPTY_STRING) || attrQname.equals(EMPTY_STRING)) { | |
// create attribute without prefix | |
attr = mFileDom.createAttribute(attributes.getLocalName(i)); | |
} else { | |
if (attrQname.startsWith("xmlns:")) { | |
// in case of xmlns prefix we have to create a new OdfNamespace | |
OdfNamespace namespace = mFileDom.setNamespace(attributes.getLocalName(i), attributes.getValue(i)); | |
// if the file Dom is already associated to parsed XML add the new namespace to the root element | |
Element root = mFileDom.getRootElement(); | |
if (root == null) { | |
root = element; | |
} | |
root.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:" + namespace.getPrefix(), namespace.getUri()); | |
} | |
// create all attributes, even namespace attributes | |
attr = mFileDom.createAttributeNS(attrURL, attrQname); | |
} | |
// namespace attributes will not be created and return null | |
if (attr != null) { | |
element.setAttributeNodeNS(attr); | |
// don't exit because of invalid attribute values | |
try { | |
// set Value in the attribute to allow validation in the attribute | |
attr.setValue(attributes.getValue(i)); | |
} // if we detect an attribute with invalid value: remove attribute node | |
catch (IllegalArgumentException e) { | |
element.removeAttributeNode(attr); | |
} | |
} | |
} | |
// add the new element as a child of the current context node | |
mNode.appendChild(element); | |
// push the new element as the context node... | |
mNode = element; | |
if (!localName.equals("bookmark-start")){ | |
setContextNode(mNode); | |
} | |
} | |
/** | |
* http://xerces.apache.org/xerces2-j/faq-sax.html#faq-2 : | |
* SAX may deliver contiguous text as multiple calls to characters, | |
* for reasons having to do with parser efficiency and input buffering. | |
* It is the programmer's responsibility to deal with that appropriately, | |
* e.g. by accumulating text until the next non-characters event. | |
*/ | |
private void flushTextNode() { | |
if (mCharsForTextNode.length() > 0) { | |
Text text = mFileDom.createTextNode(mCharsForTextNode.toString()); | |
mNode.appendChild(text); | |
mCharsForTextNode.setLength(0); | |
} | |
} | |
@Override | |
public void characters(char[] ch, int start, int length) throws SAXException { | |
if (!mHandlerStack.empty()) { | |
mHandlerStack.peek().characters(ch, start, length); | |
} else { | |
mCharsForTextNode.append(ch, start, length); | |
} | |
} | |
@Override | |
public InputSource resolveEntity(String publicId, String systemId) throws IOException, SAXException { | |
return super.resolveEntity(publicId, systemId); | |
} | |
/** | |
* Expose the current node to JenaSink to for caching the parsed RDF triples. | |
* @return | |
*/ | |
private void setContextNode(Node node){ | |
if (this.sink !=null){ | |
sink.setContextNode(node); | |
} | |
} | |
/** | |
* Set the JenaSink object. | |
* @param sink | |
*/ | |
public void setSink(JenaSink sink) { | |
this.sink = sink; | |
} | |
} |