Java XML Node Transform getHumanReadableXml(final Node node)

Description

Converts the provided DOM Node to a pretty-printed XML-formatted string.

License

Apache License

Parameter

Parameter	Description
node	The Node whose children should be converted to a String.

Return

a pretty-printed XML-formatted string.

Declaration

protected static String getHumanReadableXml(final Node node) 

Method Source Code

//package com.java2s;
/*/*from  w w w  .j  av a 2  s  .  com*/
 * 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.
 */

import org.w3c.dom.Node;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import java.io.StringWriter;

import java.util.Arrays;

public class Main {
    private static TransformerFactory FACTORY;

    /**
     * Converts the provided DOM Node to a pretty-printed XML-formatted string.
     *
     * @param node The Node whose children should be converted to a String.
     * @return a pretty-printed XML-formatted string.
     */
    protected static String getHumanReadableXml(final Node node) {
        StringWriter toReturn = new StringWriter();

        try {
            Transformer transformer = getFactory().newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");
            transformer.transform(new DOMSource(node), new StreamResult(toReturn));
        } catch (TransformerException e) {
            throw new IllegalStateException("Could not transform node [" + node.getNodeName() + "] to XML", e);
        }

        return toReturn.toString();
    }

    private static TransformerFactory getFactory() {

        if (FACTORY == null) {

            try {
                FACTORY = TransformerFactory.newInstance();

                // Harmonize XML formatting
                for (String currentAttributeName : Arrays.asList("indent-number", OutputKeys.INDENT)) {
                    try {
                        FACTORY.setAttribute(currentAttributeName, 2);
                    } catch (IllegalArgumentException ex) {
                        // Ignore this.
                    }
                }
            } catch (Throwable exception) {

                // This should really not happen... but it seems to happen in some test cases.
                throw new IllegalStateException("Could not acquire TransformerFactory implementation.", exception);
            }
        }

        // All done.
        return FACTORY;
    }
}

Related

1. buildXml(Node node)
2. copyTreeToResult(Node tree, Result result)
3. createInputStream(Node node)
4. createXML(Node doc)
5. getAsText(Node n)
6. getNodeValue(NodeList nodeList)
7. getValueOfValueNode(Node n, boolean unescape)
8. getXML(NodeList childNodes)
9. nodeToByteArray(Node node)