SnappyUnArchiver.java

package org.codehaus.plexus.archiver.snappy;

/**
 *
 * Copyright 2004 The Apache Software Foundation
 *
 *  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.
 */

import org.codehaus.plexus.archiver.AbstractUnArchiver;
import org.codehaus.plexus.archiver.ArchiverException;
import org.xerial.snappy.SnappyInputStream;

import javax.annotation.Nonnull;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import static org.codehaus.plexus.archiver.util.Streams.bufferedInputStream;
import static org.codehaus.plexus.archiver.util.Streams.bufferedOutputStream;
import static org.codehaus.plexus.archiver.util.Streams.copyFully;
import static org.codehaus.plexus.archiver.util.Streams.fileInputStream;
import static org.codehaus.plexus.archiver.util.Streams.fileOutputStream;

/**
 * Unarchiver for snappy-compressed files.
 */
public class SnappyUnArchiver
    extends AbstractUnArchiver
{
    private final static String OPERATION_SNAPPY = "snappy";

    public SnappyUnArchiver()
    {
    }

    public SnappyUnArchiver(File sourceFile)
    {
        super( sourceFile );
    }

    protected void execute()
        throws ArchiverException
    {
        if ( getSourceFile().lastModified() > getDestFile().lastModified() )
        {
            getLogger().info(
                "Expanding " + getSourceFile().getAbsolutePath() + " to " + getDestFile().getAbsolutePath() );

            copyFully( getSnappyInputStream(bufferedInputStream(fileInputStream(getSourceFile(), OPERATION_SNAPPY))),
                       bufferedOutputStream( fileOutputStream( getDestFile(), OPERATION_SNAPPY) ), OPERATION_SNAPPY);
        }
    }

    public static
    @Nonnull
    SnappyInputStream getSnappyInputStream( InputStream bis )
        throws ArchiverException
    {
        try
        {
            return new SnappyInputStream( bis );
        }
        catch ( IOException e )
        {
            throw new ArchiverException( "Trouble creating Snappy compressor, invalid file ?", e );
        }
    }

    protected void execute( String path, File outputDirectory )
    {
        throw new UnsupportedOperationException( "Targeted extraction not supported in Snappy format." );
    }
}