/*
    * 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.gzip;
  
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.zip.GZIPInputStream;
  import java.util.zip.GZIPOutputStream;
  
  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;
  
  /**
   * A Gzip file.
   */
  public class GzipFileObject extends CompressedFileFileObject<GzipFileSystem> {
  
      private static GzipFileSystem cast(final CompressedFileFileSystem fs) {
          if (fs instanceof GzipFileSystem) {
              return (GzipFileSystem) fs;
          }
          throw new IllegalArgumentException("GzipFileObject expects an instance of GzipFileSystem");
      }
  
      /**
       * Deprecated since 2.1.
       *
       * @param name Abstract file name.
       * @param container My container.
       * @param fs My file system.
       * @deprecated Use {@link #GzipFileObject(AbstractFileName, FileObject, GzipFileSystem)} instead.
       */
      @Deprecated
      protected GzipFileObject(final AbstractFileName name, final FileObject container,
              final CompressedFileFileSystem fs) {
          super(name, container, cast(fs));
      }
  
      /**
       * Constructs a new instance.
       *
       * @param fileName the file name.
       * @param container the container.
       * @param fileSystem the file system.
       */
      protected GzipFileObject(final AbstractFileName fileName, final FileObject container, final GzipFileSystem fileSystem) {
          super(fileName, container, fileSystem);
      }
  
      @Override
      protected InputStream doGetInputStream(final int bufferSize) throws Exception {
          return new GZIPInputStream(getContainer().getContent().getInputStream(), bufferSize);
      }
  
      @Override
      protected OutputStream doGetOutputStream(final boolean bAppend) throws Exception {
          return new GZIPOutputStream(getContainer().getContent().getOutputStream(false));
      }
  }