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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
package org.openoffice.xmerge.merger.diff;
import org.w3c.dom.Node;
import org.openoffice.xmerge.converter.xml.OfficeConstants;
/**
* <p>This is an implementation of the <code>Iterator</code> interface.
* It will traverse the tree and find text/space/tab <code>Node</code>
* sequences.</p>
*
* <p>Note: Once the XML Tree is parsed, then the <code>Iterator</code>
* will be a snap shot of that tree. That means even the tree is modified
* later, than the cached paragraph <code>Node</code> list will not be
* updated accordingly. For this reason and for performance reasons
* this <code>Iterator</code> does not support any operation methods
* such as insert, remove or replace. The main purpose of this
* <code>Iterator</code> is to be used with difference, not with merge.</p>
*/
public final class TextNodeIterator extends NodeIterator {
/**
* Standard constructor.
*
* @param node The initial root <code>Node</code>.
*/
public TextNodeIterator(Node node) {
super(null, node);
}
/**
* Overwrite the parent <code>nodeSupported</code> method. Only text
* <code>Node</code> objects are supported.
*
* @param node <code>Node</code> to check.
*
* @return true if the <code>Node</code> is supported, false
* otherwise.
*/
@Override
protected boolean nodeSupported(Node node) {
// can use an array later to check all possible tags for
// future expansion
return node.getNodeType() == Node.TEXT_NODE ||
node.getNodeName().equals(OfficeConstants.TAG_SPACE) ||
node.getNodeName().equals(OfficeConstants.TAG_TAB_STOP) ||
node.getNodeName().equals(OfficeConstants.TAG_LINE_BREAK);
}
}
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