content: /*
   *  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
   *
   *      https://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.tools.ant.types.resources;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  import org.apache.tools.bzip2.CBZip2InputStream;
  import org.apache.tools.bzip2.CBZip2OutputStream;
  
  /**
   * A Bzip2 compressed resource.
   *
   * <p>Wraps around another resource, delegates all queries to that
   * other resource but uncompresses/compresses streams on the fly.</p>
   *
   * @since Ant 1.7
   */
  public class BZip2Resource extends CompressedResource {
      private static final char[] MAGIC = new char[] {'B', 'Z'};
  
      /** A no-arg constructor */
      public BZip2Resource() {
      }
  
      /**
       * Constructor with another resource to wrap.
       * @param other the resource to wrap.
       */
      public BZip2Resource(org.apache.tools.ant.types.ResourceCollection other) {
          super(other);
      }
  
      /**
       * Decompress on the fly using {@link CBZip2InputStream}.
       * @param in the stream to wrap.
       * @return the wrapped stream.
       * @throws IOException if there is a problem.
       */
      @Override
      protected InputStream wrapStream(InputStream in) throws IOException {
          for (char ch : MAGIC) {
              if (in.read() != ch) {
                  throw new IOException("Invalid bz2 stream.");
              }
          }
          return new CBZip2InputStream(in);
      }
  
      /**
       * Compress on the fly using {@link CBZip2OutputStream}.
       * @param out the stream to wrap.
       * @return the wrapped stream.
       * @throws IOException if there is a problem.
       */
      @Override
      protected OutputStream wrapStream(OutputStream out) throws IOException {
          for (char ch : MAGIC) {
              out.write(ch);
          }
          return new CBZip2OutputStream(out);
      }
  
      /**
       * Get the name of the compression method.
       * @return the string "Bzip2".
       */
      @Override
      protected String getCompressionName() {
          return "Bzip2";
      }
  }
  