Package org.apache.commons.vfs.provider.bzip2

Source Code of org.apache.commons.vfs.provider.bzip2.Bzip2FileObject

/*
* Copyright 2002-2005 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.
*/
package org.apache.commons.vfs.provider.bzip2;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.provider.compressed.CompressedFileFileObject;
import org.apache.commons.vfs.provider.compressed.CompressedFileFileSystem;
import org.apache.tools.bzip2.CBZip2InputStream;
import org.apache.tools.bzip2.CBZip2OutputStream;

/**
* the bzip2 file
*
* @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
*/
public class Bzip2FileObject extends CompressedFileFileObject
{
    protected Bzip2FileObject(FileName name, FileObject container, CompressedFileFileSystem fs)
    {
        super(name, container, fs);
    }

    protected InputStream doGetInputStream() throws Exception
    {
        // check file
        InputStream is = getContainer().getContent().getInputStream();
        return wrapInputStream(getName().getURI(), is);
    }

    public static InputStream wrapInputStream(final String name, final InputStream is) throws IOException
    {
        final int b1 = is.read();
        final int b2 = is.read();
        if (b1 != 'B' || b2 != 'Z')
        {
            throw new FileSystemException("vfs.provider.compressedFile/not-a-compressedFile-file.error", name);
        }
        return new CBZip2InputStream(is);
    }

    protected OutputStream doGetOutputStream(boolean bAppend) throws Exception
    {
        OutputStream os = getContainer().getContent().getOutputStream(false);
        os.write('B');
        os.write('Z');

        return new CBZip2OutputStream(os);
    }
}
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