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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.util;
import org.w3c.dom.Node;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
/**
* Class containing static utility methods for handling XML trees.
*/
public final class XmlUtil {
/**
* Perform a deep clone of certain {@code Node} which will base on the
* document {@code Node} of the old {@code Node}.
*
* @param oldNode The {@code Document} of this {@code Node} is used to
* clone the {@code Node}.
* @param newNode The <code>Node</code> to clone.
*
* @return The cloned {@code Node}.
*/
public static Node deepClone(Node oldNode, Node newNode) {
Document docNode = oldNode.getOwnerDocument();
// clone the starting node
Node clonedNode = cloneNode(docNode, newNode);
if (clonedNode != null) {
// then clone the sub-tree recursively
cloneTree(docNode, clonedNode, newNode);
}
return clonedNode;
}
/**
* Clone the sub-tree under certain given {@code Node}.
*
* @param docNode The {@code Document} used to clone the {@code Node}.
* @param oldNode The {@code Node} to clone.
* @param newNode The destination {@code Node}.
*/
private static void cloneTree(Document docNode, Node oldNode, Node newNode) {
NodeList nodeList = newNode.getChildNodes();
int nodeListLen = nodeList.getLength();
for (int i = 0; i < nodeListLen; i++) {
Node newClonedChild = cloneNode(docNode, nodeList.item(i));
if (newClonedChild != null) {
oldNode.appendChild(newClonedChild);
cloneTree(docNode, newClonedChild, nodeList.item(i));
}
}
}
/**
* Clone a {@code Node} (either text or element).
*
* @param docNode The {@code Document} used to clone the {@code Node}.
* @param newNode The {@code Node}to clone.
*
* @return The cloned {@code Node}.
*/
private static Node cloneNode(Document docNode, Node newNode) {
Node clonedNode = null;
// only support text node and element node (will copy the attributes)
switch (newNode.getNodeType()) {
case Node.TEXT_NODE:
String textStr = newNode.getNodeValue();
clonedNode = docNode.createTextNode(textStr);
break;
case Node.ELEMENT_NODE:
Element oldElem = (Element)newNode;
String tagName = newNode.getNodeName();
Element newElem = docNode.createElement(tagName);
// copy the attributes
NamedNodeMap attrs = oldElem.getAttributes();
for (int i = 0; i < attrs.getLength(); i++) {
newElem.setAttribute(attrs.item(i).getNodeName(),
attrs.item(i).getNodeValue());
}
clonedNode = newElem;
break;
}
return clonedNode;
}
/**
* Returns the name and type of an XML DOM {@code Node}.
*
* @param node {@code Node} to query.
*
* @return Name and type of XML DOM {@code Node}.
*/
public static String getNodeInfo(Node node) {
String str = null;
switch (node.getNodeType()) {
case Node.ELEMENT_NODE:
str = "ELEMENT";
break;
case Node.ATTRIBUTE_NODE:
str = "ATTRIBUTE";
break;
case Node.TEXT_NODE:
str = "TEXT";
break;
case Node.CDATA_SECTION_NODE:
str = "CDATA_SECTION";
break;
case Node.ENTITY_REFERENCE_NODE:
str = "ENTITY_REFERENCE";
break;
case Node.ENTITY_NODE:
str = "ENTITY";
break;
case Node.PROCESSING_INSTRUCTION_NODE:
str = "PROCESSING_INSTRUCTION";
break;
case Node.COMMENT_NODE:
str = "COMMENT";
break;
case Node.DOCUMENT_NODE:
str = "DOCUMENT";
break;
case Node.DOCUMENT_TYPE_NODE:
str = "DOCUMENT_TYPE";
break;
case Node.DOCUMENT_FRAGMENT_NODE:
str = "DOCUMENT_FRAGMENT";
break;
case Node.NOTATION_NODE:
str = "NOTATION";
break;
}
StringBuffer buffer = new StringBuffer("name=\"");
buffer.append(node.getNodeName());
buffer.append("\" type=\"");
buffer.append(str);
buffer.append("\"");
return buffer.toString();
}
}
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