src/main/java/org/apache/maven/buildcache/hash/HashFactory.java

/*
 * 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.maven.buildcache.hash;

import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;

/**
 * HashFactory
 */
public enum HashFactory
{

    SHA1( new SHA( "SHA-1" ) ),
    SHA256( new SHA( "SHA-256" ) ),
    SHA384( new SHA( "SHA-384" ) ),
    SHA512( new SHA( "SHA-512" ) ),
    XX( new XX() ),
    XXMM( new XXMM() );

    private static final Map<String, HashFactory> LOOKUP = new HashMap<>();

    static
    {
        for ( HashFactory factory : HashFactory.values() )
        {
            LOOKUP.put( factory.getAlgorithm(), factory );
        }
    }

    public static HashFactory of( String algorithm ) throws NoSuchAlgorithmException
    {
        final HashFactory factory = LOOKUP.get( algorithm );
        if ( factory == null )
        {
            throw new NoSuchAlgorithmException( algorithm );
        }
        return factory;
    }

    private final Hash.Factory factory;

    HashFactory( Hash.Factory factory )
    {
        this.factory = factory;
    }

    public String getAlgorithm()
    {
        return factory.getAlgorithm();
    }

    public HashAlgorithm createAlgorithm()
    {
        return new HashAlgorithm( factory.algorithm() );
    }

    public HashChecksum createChecksum( int count )
    {
        return new HashChecksum( factory.algorithm(), factory.checksum( count ) );
    }
}