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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;
/**
* This is an implementation of the {@code Iterator} interface.
*
* <p>It will traverse the tree and find text/space/tab {@code Node} sequences.
* </p>
*
* <p>Note: Once the XML Tree is parsed, then the {@code Iterator} will be a
* snap shot of that tree. That means even the tree is modified later, than the
* cached paragraph {@code Node} list will not be updated accordingly. For this
* reason and for performance reasons this {@code Iterator} does not support
* any operation methods such as insert, remove or replace. The main purpose of
* this {@code Iterator} 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}.
*/
public TextNodeIterator(Node node) {
super(null, node);
}
/**
* Overwrite the parent {@code nodeSupported} method.
*
* <p>Only text {@code Node} objects are supported.</p>
*
* @param node {@code Node} to check.
*
* @return {@code true} if the {@code Node} is supported, {@code 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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