de.blizzy.backup.Compression.java Source code

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Here is the source code for de.blizzy.backup.Compression.java

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/*
blizzy's Backup - Easy to use personal file backup application
Copyright (C) 2011-2012 Maik Schreiber
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package de.blizzy.backup;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;

public enum Compression {
    GZIP(1), BZIP2(2);

    private int value;

    private Compression(int value) {
        this.value = value;
    }

    public int getValue() {
        return value;
    }

    public InputStream getInputStream(InputStream in) throws IOException {
        if (this == GZIP) {
            return new GZIPInputStream(in);
        }
        if (this == BZIP2) {
            return new BZip2CompressorInputStream(in);
        }
        throw new RuntimeException();
    }

    public OutputStream getOutputStream(OutputStream out) throws IOException {
        if (this == GZIP) {
            return new GZIPOutputStream(out);
        }
        if (this == BZIP2) {
            return new BZip2CompressorOutputStream(out);
        }
        throw new RuntimeException();
    }

    public static Compression fromValue(int value) {
        if (value == GZIP.value) {
            return GZIP;
        }
        if (value == BZIP2.value) {
            return BZIP2;
        }
        throw new IllegalArgumentException("unknown value: " + value); //$NON-NLS-1$
    }
}