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/*
 * =============================================================================
 * 
 *   Copyright (c) 2007-2010, The JASYPT team (http://www.jasypt.org)
 * 
 *   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.jasypt.registry;

import java.security.Security;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;


/**
 * 
 * Utility class for retrieving the names of all the digest or encryption
 * algorithms available to Jasypt.
 * 
 * 
 * This class is thread-safe.
 * 
 * 
 * @since 1.7
 * 
 * @author Daniel Fernández
 * 
 */
public final class AlgorithmRegistry {

    
    /**
     * 
     * Returns a set with the names of all the registered digest algorithms.
     * This set will also include algorithms from any third-party (non-JVM) registered
     * providers.
     * 
     * 
     * @since 1.7
     * 
     * @return a Set of Strings with the names of all the registered
     *         digest algorithms.
     */
    public static Set getAllDigestAlgorithms() {
        final List algos = new ArrayList(Security.getAlgorithms("MessageDigest"));
        Collections.sort(algos);
        return Collections.unmodifiableSet(new LinkedHashSet(algos));
    }

    
    /**
     * 
     * Returns a set with the names of all the registered PBE (Password-Based
     * Encryption) algorithms.
     * This set will also include algorithms from any third-party (non-JVM) registered
     * providers.
     * 
     * 
     * @since 1.7
     * 
     * @return a Set of Strings with the names of all the registered
     *         PBE algorithms.
     */
    public static Set getAllPBEAlgorithms() {
        final List algos = new ArrayList(Security.getAlgorithms("Cipher"));
        Collections.sort(algos);
        final LinkedHashSet pbeAlgos = new LinkedHashSet();
        final Iterator algosIter = algos.iterator();
        while (algosIter.hasNext()) {
            final String algo = (String) algosIter.next();
            if (algo != null && algo.startsWith("PBE")) {
                pbeAlgos.add(algo);
            }
        }
        return Collections.unmodifiableSet(pbeAlgos);
    }
    
    
    
    private AlgorithmRegistry() {
        super();
    }
    
}