Source code

001package org.apache.archiva.checksum;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *   http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.io.File;
023
024import org.apache.commons.io.FilenameUtils;
025
026/**
027 * Enumeration of available ChecksumAlgorithm techniques.
028 *
029 *
030 */
031public enum ChecksumAlgorithm {
032    SHA1("SHA-1", "sha1", "SHA1"),
033    MD5("MD5", "md5", "MD5");
034
035    public static ChecksumAlgorithm getByExtension( File file )
036    {
037        String ext = FilenameUtils.getExtension( file.getName() ).toLowerCase();
038        if ( ChecksumAlgorithm.SHA1.getExt().equals( ext ) )
039        {
040            return ChecksumAlgorithm.SHA1;
041        }
042        else if ( ChecksumAlgorithm.MD5.getExt().equals( ext ) )
043        {
044            return ChecksumAlgorithm.MD5;
045        }
046
047        throw new IllegalArgumentException( "Filename " + file.getName() + " has no associated extension." );
048    }
049
050    /**
051     * The MessageDigest algorithm for this hash.
052     */
053    private final String algorithm;
054
055    /**
056     * The file extension for this ChecksumAlgorithm.
057     */
058    private final String ext;
059
060    /**
061     * The checksum type, the key that you see in checksum files.
062     */
063    private final String type;
064
065    /**
066     * Construct a ChecksumAlgorithm
067     * 
068     * @param algorithm the MessageDigest algorithm
069     * @param ext the file extension.
070     * @param type the checksum type.
071     */
072    private ChecksumAlgorithm( String algorithm, String ext, String type )
073    {
074        this.algorithm = algorithm;
075        this.ext = ext;
076        this.type = type;
077    }
078
079    public String getAlgorithm()
080    {
081        return algorithm;
082    }
083
084    public String getExt()
085    {
086        return ext;
087    }
088
089    public String getType()
090    {
091        return type;
092    }
093    
094    
095}