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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
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>
*
* @author smak
*/
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.
*/
protected boolean nodeSupported(Node node) {
// can use an array later to check all possible tags for
// future expansion
if (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)) {
return true;
} else {
return false;
}
}
}
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