Deep clones a document using the given DOM implementation. - Java XML

Java examples for XML:DOM Document

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Description

Deep clones a document using the given DOM implementation.

Demo Code

/*/*from w w w. j  a  v a  2 s  .c o  m*/

   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

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */
//package com.java2s;

import org.w3c.dom.Attr;

import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;

import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

public class Main {
    /**
     * Deep clones a document using the given DOM implementation.
     */
    public static Document deepCloneDocument(Document doc,
            DOMImplementation impl) {
        Element root = doc.getDocumentElement();
        Document result = impl.createDocument(root.getNamespaceURI(),
                root.getNodeName(), null);
        Element rroot = result.getDocumentElement();
        boolean before = true;
        for (Node n = doc.getFirstChild(); n != null; n = n
                .getNextSibling()) {
            if (n == root) {
                before = false;
                if (root.hasAttributes()) {
                    NamedNodeMap attr = root.getAttributes();
                    int len = attr.getLength();
                    for (int i = 0; i < len; i++) {
                        rroot.setAttributeNode((Attr) result.importNode(
                                attr.item(i), true));
                    }
                }
                for (Node c = root.getFirstChild(); c != null; c = c
                        .getNextSibling()) {
                    rroot.appendChild(result.importNode(c, true));
                }
            } else {
                if (n.getNodeType() != Node.DOCUMENT_TYPE_NODE) {
                    if (before) {
                        result.insertBefore(result.importNode(n, true),
                                rroot);
                    } else {
                        result.appendChild(result.importNode(n, true));
                    }
                }
            }
        }
        return result;
    }
}

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