package org.beanstalk4j.xml;

import java.io.StringReader;
import java.io.StringWriter;

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

/*
 * Copyright 2011 Björn Raupach

   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.
 */
public class XMLFormatter {
	
	public static String prettyFormat(String input) {
		if (input == null || input.trim().isEmpty()) {
			return "";
		}
	    try {
	        Source xmlInput = new StreamSource(new StringReader(input));
	        StringWriter stringWriter = new StringWriter();
	        StreamResult xmlOutput = new StreamResult(stringWriter);
	        TransformerFactory transformerFactory = TransformerFactory.newInstance();
	        transformerFactory.setAttribute("indent-number", 2);
	        Transformer transformer = transformerFactory.newTransformer(); 
	        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
	        transformer.transform(xmlInput, xmlOutput);
	        return xmlOutput.getWriter().toString();
	    } catch (Exception e) {
	        throw new RuntimeException(e);
	    }
	}
	
}
