001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.vfs2.provider.bzip2;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.io.OutputStream;
022
023import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
024import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;
025import org.apache.commons.vfs2.FileObject;
026import org.apache.commons.vfs2.provider.AbstractFileName;
027import org.apache.commons.vfs2.provider.compressed.CompressedFileFileObject;
028import org.apache.commons.vfs2.provider.compressed.CompressedFileFileSystem;
029
030/**
031 * the bzip2 file.
032 */
033public class Bzip2FileObject extends CompressedFileFileObject<Bzip2FileSystem> {
034    /**
035     * Deprecated since 2.1.
036     *
037     * @deprecated Use {@link #Bzip2FileObject(AbstractFileName, FileObject, Bzip2FileSystem)} instead.
038     */
039    @Deprecated
040    protected Bzip2FileObject(final AbstractFileName name, final FileObject container,
041            final CompressedFileFileSystem fs) {
042        super(name, container, cast(fs));
043    }
044
045    protected Bzip2FileObject(final AbstractFileName name, final FileObject container, final Bzip2FileSystem fs) {
046        super(name, container, fs);
047    }
048
049    @Override
050    protected InputStream doGetInputStream() throws Exception {
051        // check file
052        final InputStream is = getContainer().getContent().getInputStream();
053        return wrapInputStream(getName().getURI(), is);
054    }
055
056    public static InputStream wrapInputStream(final String name, final InputStream is) throws IOException {
057        return new BZip2CompressorInputStream(is);
058    }
059
060    @Override
061    protected OutputStream doGetOutputStream(final boolean bAppend) throws Exception {
062        final OutputStream os = getContainer().getContent().getOutputStream(false);
063        return new BZip2CompressorOutputStream(os);
064    }
065
066    private static Bzip2FileSystem cast(final CompressedFileFileSystem fs) {
067        if (fs instanceof Bzip2FileSystem) {
068            return (Bzip2FileSystem) fs;
069        }
070        throw new IllegalArgumentException("Bzip2FileObject requires a Bzip2FileSystem implementation");
071    }
072}