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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * 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 org.apache.xml.security.stax.config;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.XMLSecurityConstants;
import org.apache.xml.security.utils.ClassLoaderUtils;
import org.apache.xml.security.configuration.TransformAlgorithmType;
import org.apache.xml.security.configuration.TransformAlgorithmsType;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Mapping between JCE id and xmlsec uri's for algorithms
 *
 * @author $Author: coheigea $
 * @version $Revision: 1676996 $ $Date: 2015-04-30 15:10:20 +0100 (Thu, 30 Apr 2015) $
 */
public class TransformerAlgorithmMapper {

    private static Map> algorithmsClassMapInOut;
    private static Map> algorithmsClassMapIn;
    private static Map> algorithmsClassMapOut;

    private TransformerAlgorithmMapper() {
    }

    protected static synchronized void init(TransformAlgorithmsType transformAlgorithms,
            Class callingClass) throws Exception {
        List algorithms = transformAlgorithms.getTransformAlgorithm();
        algorithmsClassMapInOut = new HashMap>();
        algorithmsClassMapIn = new HashMap>();
        algorithmsClassMapOut = new HashMap>();

        for (int i = 0; i < algorithms.size(); i++) {
            TransformAlgorithmType algorithmType = algorithms.get(i);
            if (algorithmType.getINOUT() == null) {
                algorithmsClassMapInOut.put(algorithmType.getURI(), 
                        ClassLoaderUtils.loadClass(algorithmType.getJAVACLASS(), callingClass));
            } else if ("IN".equals(algorithmType.getINOUT().value())) {
                algorithmsClassMapIn.put(algorithmType.getURI(), 
                        ClassLoaderUtils.loadClass(algorithmType.getJAVACLASS(), callingClass));
            } else if ("OUT".equals(algorithmType.getINOUT().value())) {
                algorithmsClassMapOut.put(algorithmType.getURI(), 
                        ClassLoaderUtils.loadClass(algorithmType.getJAVACLASS(), callingClass));
            } else {
                throw new IllegalArgumentException("INOUT parameter " + algorithmType.getINOUT().value() + " unsupported");
            }
        }
    }

    public static Class getTransformerClass(String algoURI, XMLSecurityConstants.DIRECTION direction) throws XMLSecurityException {
        Class clazz = null;

        switch (direction) {
            case IN:
                clazz = algorithmsClassMapIn.get(algoURI);
                break;
            case OUT:
                clazz = algorithmsClassMapOut.get(algoURI);
                break;
        }

        if (clazz == null) {
            clazz = algorithmsClassMapInOut.get(algoURI);
        }
        if (clazz == null) {
            throw new XMLSecurityException("signature.Transform.UnknownTransform", 
                                           new Object[] {algoURI});
        }
        return clazz;
    }
}