mirror of https://github.com/moparisthebest/k-9
250 lines
6.5 KiB
Java
250 lines
6.5 KiB
Java
/*
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* Sax2Dom.java
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*/
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package com.fsck.k9.parser;
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/* Copyright 2004 The Apache Software Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import org.w3c.dom.Node;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.ProcessingInstruction;
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import org.w3c.dom.Comment;
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import org.xml.sax.Attributes;
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import org.xml.sax.Locator;
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import org.xml.sax.SAXException;
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import org.xml.sax.ContentHandler;
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import org.xml.sax.helpers.DefaultHandler;
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import org.xml.sax.ext.LexicalHandler;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.parsers.DocumentBuilderFactory;
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import java.util.Stack;
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import java.util.Vector;
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public class Sax2Dom
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extends DefaultHandler
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implements ContentHandler, LexicalHandler
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{
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public static final String EMPTYSTRING = "";
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public static final String XML_PREFIX = "xml";
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public static final String XMLNS_PREFIX = "xmlns";
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public static final String XMLNS_STRING = "xmlns:";
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public static final String XMLNS_URI = "http://www.w3.org/2000/xmlns/";
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private Node _root = null;
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private Document _document = null;
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private Stack _nodeStk = new Stack();
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private Vector _namespaceDecls = null;
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public Sax2Dom() throws ParserConfigurationException
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{
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final DocumentBuilderFactory factory =
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DocumentBuilderFactory.newInstance();
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_document = factory.newDocumentBuilder().newDocument();
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_root = _document;
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}
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public Sax2Dom(Node root) throws ParserConfigurationException
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{
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_root = root;
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if (root instanceof Document)
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{
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_document = (Document) root;
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}
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else if (root != null)
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{
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_document = root.getOwnerDocument();
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}
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else
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{
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final DocumentBuilderFactory factory =
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DocumentBuilderFactory.newInstance();
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_document = factory.newDocumentBuilder().newDocument();
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_root = _document;
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}
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}
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public Node getDOM()
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{
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return _root;
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}
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public void characters(char[] ch, int start, int length)
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{
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final Node last = (Node) _nodeStk.peek();
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// No text nodes can be children of root (DOM006 exception)
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if (last != _document)
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{
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final String text = new String(ch, start, length);
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last.appendChild(_document.createTextNode(text));
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}
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}
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public void startDocument()
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{
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_nodeStk.push(_root);
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}
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public void endDocument()
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{
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_nodeStk.pop();
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}
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public void startElement(String namespace, String localName, String qName,
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Attributes attrs)
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{
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final Element tmp = (Element) _document.createElementNS(namespace, qName);
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// Add namespace declarations first
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if (_namespaceDecls != null)
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{
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final int nDecls = _namespaceDecls.size();
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for (int i = 0; i < nDecls; i++)
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{
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final String prefix = (String) _namespaceDecls.elementAt(i++);
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if (prefix == null || prefix.equals(EMPTYSTRING))
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{
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tmp.setAttributeNS(XMLNS_URI, XMLNS_PREFIX,
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(String) _namespaceDecls.elementAt(i));
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}
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else
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{
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tmp.setAttributeNS(XMLNS_URI, XMLNS_STRING + prefix,
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(String) _namespaceDecls.elementAt(i));
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}
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}
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_namespaceDecls.clear();
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}
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// Add attributes to element
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final int nattrs = attrs.getLength();
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for (int i = 0; i < nattrs; i++)
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{
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if (attrs.getLocalName(i) == null)
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{
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tmp.setAttribute(attrs.getQName(i), attrs.getValue(i));
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}
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else
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{
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tmp.setAttributeNS(attrs.getURI(i), attrs.getQName(i),
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attrs.getValue(i));
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}
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}
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// Append this new node onto current stack node
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Node last = (Node) _nodeStk.peek();
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last.appendChild(tmp);
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// Push this node onto stack
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_nodeStk.push(tmp);
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}
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public void endElement(String namespace, String localName, String qName)
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{
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_nodeStk.pop();
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}
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public void startPrefixMapping(String prefix, String uri)
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{
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if (_namespaceDecls == null)
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{
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_namespaceDecls = new Vector(2);
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}
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_namespaceDecls.addElement(prefix);
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_namespaceDecls.addElement(uri);
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}
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public void endPrefixMapping(String prefix)
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{
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// do nothing
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}
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/**
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* This class is only used internally so this method should never
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* be called.
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*/
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public void ignorableWhitespace(char[] ch, int start, int length)
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{
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}
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/**
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* adds processing instruction node to DOM.
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*/
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public void processingInstruction(String target, String data)
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{
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final Node last = (Node) _nodeStk.peek();
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ProcessingInstruction pi = _document.createProcessingInstruction(
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target, data);
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if (pi != null) last.appendChild(pi);
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}
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/**
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* This class is only used internally so this method should never
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* be called.
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*/
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public void setDocumentLocator(Locator locator)
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{
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}
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/**
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* This class is only used internally so this method should never
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* be called.
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*/
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public void skippedEntity(String name)
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{
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}
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/**
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* Lexical Handler method to create comment node in DOM tree.
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*/
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public void comment(char[] ch, int start, int length)
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{
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final Node last = (Node) _nodeStk.peek();
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Comment comment = _document.createComment(new String(ch, start, length));
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if (comment != null) last.appendChild(comment);
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}
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// Lexical Handler methods- not implemented
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public void startCDATA()
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{
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}
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public void endCDATA()
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{
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}
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public void startEntity(java.lang.String name)
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{
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}
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public void endEntity(String name)
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{
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}
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public void startDTD(String name, String publicId, String systemId)
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throws SAXException
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{
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}
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public void endDTD()
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{
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}
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} |