org.jivesoftware.smackx.pubsub.util.XmlUtils Maven / Gradle / Ivy

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Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.

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/**
 * All rights reserved. Licensed 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 org.jivesoftware.smackx.pubsub.util;

import java.io.StringReader;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

/**
 * Simple utility for pretty printing xml.
 * 
 * @author Robin Collier
 */
public class XmlUtils
{
	/**
	 * 
	 * @param header Just a title for the stanza for readability.  Single word no spaces since
	 * it is inserted as the root element in the output.
	 * @param xml The string to pretty print
	 */
	static public void prettyPrint(String header, String xml)
	{
		try
		{
			Transformer transformer = TransformerFactory.newInstance().newTransformer();
			transformer.setOutputProperty(OutputKeys.INDENT, "yes");
			transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "3");

			if (header != null)
			{
				xml = "\n<" + header + ">" + xml + "';
			}
			transformer.transform(new StreamSource(new StringReader(xml)), new StreamResult(System.out));
		}
		catch (Exception e)
		{
			System.out.println("Something wrong with xml in \n---------------\n" + xml + "\n---------------");
			e.printStackTrace();
		}
	}

	static public void appendAttribute(StringBuilder builder, String att, String value)
	{
		builder.append(" ");
		builder.append(att);
		builder.append("='");
		builder.append(value);
		builder.append("'");
	}

}