core/src/main/java/org/apache/commons/vfs2/provider/bzip2/Bzip2FileObject.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.commons.vfs2.provider.bzip2;

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

import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.provider.AbstractFileName;
import org.apache.commons.vfs2.provider.compressed.CompressedFileFileObject;
import org.apache.commons.vfs2.provider.compressed.CompressedFileFileSystem;

/**
 * the bzip2 file.
 */
public class Bzip2FileObject extends CompressedFileFileObject<Bzip2FileSystem>
{
    /**
     * Deprecated since 2.1. Use {@link #Bzip2FileObject(AbstractFileName, FileObject, Bzip2FileSystem)} instead.
     */
    @Deprecated
    protected Bzip2FileObject(final AbstractFileName name, final FileObject container, final CompressedFileFileSystem fs)
    {
        super(name, container, cast(fs));
    }

    protected Bzip2FileObject(final AbstractFileName name, final FileObject container, final Bzip2FileSystem fs)
    {
        super(name, container, fs);
    }

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

    public static InputStream wrapInputStream(final String name, final InputStream is) throws IOException
    {
        return new BZip2CompressorInputStream(is);
    }

    @Override
    protected OutputStream doGetOutputStream(final boolean bAppend) throws Exception
    {
        final OutputStream os = getContainer().getContent().getOutputStream(false);
        return new BZip2CompressorOutputStream(os);
    }

    private static Bzip2FileSystem cast(CompressedFileFileSystem fs) {
        if (fs instanceof Bzip2FileSystem) {
            return (Bzip2FileSystem) fs;
        }
        throw new IllegalArgumentException("Bzip2FileObject requires a Bzip2FileSystem implementation");
    }
}