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Java APIs to validate and request VOMS attribute certificates

There is a newer version: 3.3.2

/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare, 2006-2012.
 *
 * 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.italiangrid.voms.util;

import java.io.StringWriter;

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

import org.italiangrid.voms.VOMSError;
import org.w3c.dom.Document;

public class XMLUtils {

	public static String documentAsString(Document doc){
	
		try {
			Transformer transformer = TransformerFactory.newInstance().newTransformer();
			transformer.setOutputProperty(OutputKeys.INDENT, "yes");
			StreamResult result = new StreamResult(new StringWriter());
			DOMSource source = new DOMSource(doc);
			transformer.transform(source, result);
			return result.getWriter().toString();
		
		} catch (Throwable e) {
			throw new VOMSError(e.getMessage(), e);
		}
		
	}
}