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463 lines
12 KiB
463 lines
12 KiB
/*
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* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
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*/
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. 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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package com.sun.org.apache.xml.internal.utils;
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import com.sun.org.apache.xml.internal.dtm.ref.dom2dtm.DOM2DTM.CharacterNodeHandler;
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import javax.xml.transform.Result;
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import org.w3c.dom.Comment;
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import org.w3c.dom.Element;
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import org.w3c.dom.EntityReference;
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import org.w3c.dom.NamedNodeMap;
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import org.w3c.dom.Node;
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import org.w3c.dom.ProcessingInstruction;
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import org.w3c.dom.Text;
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import org.xml.sax.ContentHandler;
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import org.xml.sax.Locator;
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import org.xml.sax.ext.LexicalHandler;
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import org.xml.sax.helpers.LocatorImpl;
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/**
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* This class does a pre-order walk of the DOM tree, calling a ContentHandler
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* interface as it goes.
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* @xsl.usage advanced
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*/
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public class TreeWalker
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{
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/** Local reference to a ContentHandler */
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private ContentHandler m_contentHandler = null;
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/** Locator object for this TreeWalker */
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private LocatorImpl m_locator = new LocatorImpl();
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/**
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* Get the ContentHandler used for the tree walk.
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*
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* @return the ContentHandler used for the tree walk
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*/
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public ContentHandler getContentHandler()
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{
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return m_contentHandler;
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}
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/**
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* Get the ContentHandler used for the tree walk.
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*
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* @return the ContentHandler used for the tree walk
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*/
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public void setContentHandler(ContentHandler ch)
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{
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m_contentHandler = ch;
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}
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/**
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* Constructor.
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* @param contentHandler The implementation of the
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* @param systemId System identifier for the document.
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* contentHandler operation (toXMLString, digest, ...)
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*/
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public TreeWalker(ContentHandler contentHandler, String systemId)
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{
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this.m_contentHandler = contentHandler;
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if (m_contentHandler != null) {
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m_contentHandler.setDocumentLocator(m_locator);
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}
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if (systemId != null) {
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m_locator.setSystemId(systemId);
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}
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}
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/**
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* Constructor.
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* @param contentHandler The implementation of the
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* contentHandler operation (toXMLString, digest, ...)
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*/
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public TreeWalker(ContentHandler contentHandler)
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{
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this(contentHandler, null);
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}
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/**
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* Perform a pre-order traversal non-recursive style.
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*
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* Note that TreeWalker assumes that the subtree is intended to represent
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* a complete (though not necessarily well-formed) document and, during a
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* traversal, startDocument and endDocument will always be issued to the
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* SAX listener.
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*
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* @param pos Node in the tree where to start traversal
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*
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* @throws TransformerException
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*/
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public void traverse(Node pos) throws org.xml.sax.SAXException
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{
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this.m_contentHandler.startDocument();
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traverseFragment(pos);
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this.m_contentHandler.endDocument();
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}
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/**
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* Perform a pre-order traversal non-recursive style.
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*
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* In contrast to the traverse() method this method will not issue
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* startDocument() and endDocument() events to the SAX listener.
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*
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* @param pos Node in the tree where to start traversal
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*
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* @throws TransformerException
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*/
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public void traverseFragment(Node pos) throws org.xml.sax.SAXException
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{
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Node top = pos;
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while (null != pos)
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{
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startNode(pos);
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Node nextNode = pos.getFirstChild();
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while (null == nextNode)
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{
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endNode(pos);
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if (top.equals(pos))
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break;
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nextNode = pos.getNextSibling();
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if (null == nextNode)
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{
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pos = pos.getParentNode();
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if ((null == pos) || (top.equals(pos)))
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{
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if (null != pos)
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endNode(pos);
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nextNode = null;
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break;
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}
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}
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}
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pos = nextNode;
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}
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}
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/**
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* Perform a pre-order traversal non-recursive style.
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* Note that TreeWalker assumes that the subtree is intended to represent
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* a complete (though not necessarily well-formed) document and, during a
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* traversal, startDocument and endDocument will always be issued to the
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* SAX listener.
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*
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* @param pos Node in the tree where to start traversal
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* @param top Node in the tree where to end traversal
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*
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* @throws TransformerException
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*/
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public void traverse(Node pos, Node top) throws org.xml.sax.SAXException
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{
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this.m_contentHandler.startDocument();
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while (null != pos)
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{
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startNode(pos);
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Node nextNode = pos.getFirstChild();
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while (null == nextNode)
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{
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endNode(pos);
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if ((null != top) && top.equals(pos))
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break;
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nextNode = pos.getNextSibling();
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if (null == nextNode)
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{
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pos = pos.getParentNode();
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if ((null == pos) || ((null != top) && top.equals(pos)))
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{
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nextNode = null;
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break;
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}
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}
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}
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pos = nextNode;
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}
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this.m_contentHandler.endDocument();
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}
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// Flag indicating whether following text to be processed is raw text
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boolean nextIsRaw = false;
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/**
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* Optimized dispatch of characters.
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*/
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private final void dispatachChars(Node node)
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throws org.xml.sax.SAXException
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{
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if(m_contentHandler instanceof CharacterNodeHandler)
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{
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((CharacterNodeHandler)m_contentHandler).characters(node);
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}
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else
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{
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String data = ((Text) node).getData();
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this.m_contentHandler.characters(data.toCharArray(), 0, data.length());
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}
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}
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/**
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* Start processing given node
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*
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*
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* @param node Node to process
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*
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* @throws org.xml.sax.SAXException
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*/
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protected void startNode(Node node) throws org.xml.sax.SAXException
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{
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if (m_contentHandler instanceof NodeConsumer)
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{
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((NodeConsumer) m_contentHandler).setOriginatingNode(node);
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}
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if (node instanceof Locator)
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{
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Locator loc = (Locator)node;
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m_locator.setColumnNumber(loc.getColumnNumber());
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m_locator.setLineNumber(loc.getLineNumber());
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m_locator.setPublicId(loc.getPublicId());
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m_locator.setSystemId(loc.getSystemId());
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}
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else
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{
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m_locator.setColumnNumber(0);
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m_locator.setLineNumber(0);
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}
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switch (node.getNodeType())
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{
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case Node.COMMENT_NODE :
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{
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String data = ((Comment) node).getData();
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if (m_contentHandler instanceof LexicalHandler)
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{
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LexicalHandler lh = ((LexicalHandler) this.m_contentHandler);
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lh.comment(data.toCharArray(), 0, data.length());
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}
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}
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break;
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case Node.DOCUMENT_FRAGMENT_NODE :
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// ??;
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break;
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case Node.DOCUMENT_NODE :
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break;
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case Node.ELEMENT_NODE :
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NamedNodeMap atts = ((Element) node).getAttributes();
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int nAttrs = atts.getLength();
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for (int i = 0; i < nAttrs; i++)
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{
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Node attr = atts.item(i);
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String attrName = attr.getNodeName();
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if (attrName.equals("xmlns") || attrName.startsWith("xmlns:"))
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{
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int index;
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// Use "" instead of null, as Xerces likes "" for the
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// name of the default namespace. Fix attributed
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// to "Steven Murray" <smurray@ebt.com>.
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String prefix = (index = attrName.indexOf(":")) < 0
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? "" : attrName.substring(index + 1);
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this.m_contentHandler.startPrefixMapping(prefix,
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attr.getNodeValue());
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}
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}
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String ns = DOM2Helper.getNamespaceOfNode(node);
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if(null == ns)
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ns = "";
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this.m_contentHandler.startElement(ns,
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DOM2Helper.getLocalNameOfNode(node),
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node.getNodeName(),
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new AttList(atts));
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break;
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case Node.PROCESSING_INSTRUCTION_NODE :
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{
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ProcessingInstruction pi = (ProcessingInstruction) node;
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String name = pi.getNodeName();
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// String data = pi.getData();
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if (name.equals("xslt-next-is-raw"))
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{
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nextIsRaw = true;
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}
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else
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{
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this.m_contentHandler.processingInstruction(pi.getNodeName(),
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pi.getData());
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}
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}
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break;
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case Node.CDATA_SECTION_NODE :
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{
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boolean isLexH = (m_contentHandler instanceof LexicalHandler);
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LexicalHandler lh = isLexH
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? ((LexicalHandler) this.m_contentHandler) : null;
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if (isLexH)
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{
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lh.startCDATA();
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}
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dispatachChars(node);
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{
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if (isLexH)
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{
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lh.endCDATA();
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}
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}
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}
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break;
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case Node.TEXT_NODE :
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{
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//String data = ((Text) node).getData();
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if (nextIsRaw)
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{
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nextIsRaw = false;
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m_contentHandler.processingInstruction(Result.PI_DISABLE_OUTPUT_ESCAPING, "");
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dispatachChars(node);
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m_contentHandler.processingInstruction(Result.PI_ENABLE_OUTPUT_ESCAPING, "");
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}
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else
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{
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dispatachChars(node);
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}
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}
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break;
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case Node.ENTITY_REFERENCE_NODE :
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{
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EntityReference eref = (EntityReference) node;
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if (m_contentHandler instanceof LexicalHandler)
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{
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((LexicalHandler) this.m_contentHandler).startEntity(
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eref.getNodeName());
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}
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else
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{
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// warning("Can not output entity to a pure SAX ContentHandler");
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}
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}
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break;
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default :
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}
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}
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/**
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* End processing of given node
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*
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*
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* @param node Node we just finished processing
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*
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* @throws org.xml.sax.SAXException
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*/
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protected void endNode(Node node) throws org.xml.sax.SAXException
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{
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switch (node.getNodeType())
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{
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case Node.DOCUMENT_NODE :
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break;
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case Node.ELEMENT_NODE :
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String ns = DOM2Helper.getNamespaceOfNode(node);
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if(null == ns)
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ns = "";
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this.m_contentHandler.endElement(ns,
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DOM2Helper.getLocalNameOfNode(node),
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node.getNodeName());
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NamedNodeMap atts = ((Element) node).getAttributes();
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int nAttrs = atts.getLength();
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for (int i = 0; i < nAttrs; i++)
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{
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Node attr = atts.item(i);
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String attrName = attr.getNodeName();
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if (attrName.equals("xmlns") || attrName.startsWith("xmlns:"))
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{
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int index;
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// Use "" instead of null, as Xerces likes "" for the
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// name of the default namespace. Fix attributed
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// to "Steven Murray" <smurray@ebt.com>.
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String prefix = (index = attrName.indexOf(":")) < 0
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? "" : attrName.substring(index + 1);
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this.m_contentHandler.endPrefixMapping(prefix);
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}
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}
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break;
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case Node.CDATA_SECTION_NODE :
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break;
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case Node.ENTITY_REFERENCE_NODE :
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{
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EntityReference eref = (EntityReference) node;
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if (m_contentHandler instanceof LexicalHandler)
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{
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LexicalHandler lh = ((LexicalHandler) this.m_contentHandler);
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lh.endEntity(eref.getNodeName());
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}
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}
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break;
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default :
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}
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}
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} //TreeWalker
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