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.gzip;
018
019import java.io.InputStream;
020import java.io.OutputStream;
021import java.util.zip.GZIPInputStream;
022import java.util.zip.GZIPOutputStream;
023
024import org.apache.commons.vfs2.FileObject;
025import org.apache.commons.vfs2.provider.AbstractFileName;
026import org.apache.commons.vfs2.provider.compressed.CompressedFileFileObject;
027import org.apache.commons.vfs2.provider.compressed.CompressedFileFileSystem;
028
029/**
030 * the gzip file.
031 */
032public class GzipFileObject extends CompressedFileFileObject<GzipFileSystem> {
033    /**
034     * Deprecated since 2.1.
035     *
036     * @deprecated Use {@link #GzipFileObject(AbstractFileName, FileObject, GzipFileSystem)} instead.
037     */
038    @Deprecated
039    protected GzipFileObject(final AbstractFileName name, final FileObject container,
040            final CompressedFileFileSystem fs) {
041        super(name, container, cast(fs));
042    }
043
044    protected GzipFileObject(final AbstractFileName name, final FileObject container, final GzipFileSystem fs) {
045        super(name, container, fs);
046    }
047
048    @Override
049    protected InputStream doGetInputStream() throws Exception {
050        final InputStream is = getContainer().getContent().getInputStream();
051        return new GZIPInputStream(is);
052    }
053
054    @Override
055    protected OutputStream doGetOutputStream(final boolean bAppend) throws Exception {
056        final OutputStream os = getContainer().getContent().getOutputStream(false);
057        return new GZIPOutputStream(os);
058    }
059
060    private static GzipFileSystem cast(final CompressedFileFileSystem fs) {
061        if (fs instanceof GzipFileSystem) {
062            return (GzipFileSystem) fs;
063        }
064        throw new IllegalArgumentException("GzipFileObject expects an instance of GzipFileSystem");
065    }
066}