package org.codehaus.plexus.util.cli;

 /*

  * 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.

  */

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.OutputStream;

 /**

  * Read from an InputStream and write the output to an OutputStream.

  *

  * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>

  * @version $Id: StreamFeeder.java 591654 2007-11-03 17:14:56Z dennisl $

  */

 public class StreamFeeder

     extends Thread

 {

     private InputStream input;

     private OutputStream output;

     private boolean done;

     /**

      * Create a new StreamFeeder

      *

      * @param input  Stream to read from

      * @param output Stream to write to

      */

     public StreamFeeder( InputStream input, OutputStream output )

     {

         this.input = input;

         this.output = output;

     }

     // ----------------------------------------------------------------------

     // Runnable implementation

     // ----------------------------------------------------------------------

     public void run()

     {

         try

         {

             feed();

         }

         catch ( Throwable ex )

         {

             // Catched everything so the streams will be closed and flagged as done.

         }

         finally

         {

             close();

             done = true;

             synchronized ( this )

             {

                 this.notifyAll();

             }

         }

     }

     // ----------------------------------------------------------------------

     //

     // ----------------------------------------------------------------------

     public void close()

     {

         if ( input != null )

         {

             synchronized ( input )

             {

                 try

                 {

                     input.close();

                 }

                 catch ( IOException ex )

                 {

                     // ignore

                 }

                 input = null;

             }

         }

         if ( output != null )

         {

             synchronized ( output )

             {

                 try

                 {

                     output.close();

                 }

                 catch ( IOException ex )

                 {

                     // ignore

                 }

                 output = null;

             }

         }

     }

     public boolean isDone()

     {

         return done;

     }

     // ----------------------------------------------------------------------

     //

     // ----------------------------------------------------------------------

     private void feed()

         throws IOException

     {

         int data = input.read();

         while ( !done && data != -1 )

         {

             synchronized ( output )

             {

                 output.write( data );

                 data = input.read();

             }

         }

     }

 }