/*

  * 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.launcher;

 import java.io.InputStream;

 import java.io.IOException;

 import java.io.OutputStream;

  /**

  * A class for connecting an OutputStream to an InputStream.

  *

  * @author Patrick Luby

  */

 public class StreamConnector extends Thread {

     //------------------------------------------------------------------ Fields

     /**

      * Input stream to read from.

      */

     private InputStream is = null;

     /**

      * Output stream to write to.

      */

     private OutputStream os = null;

     //------------------------------------------------------------ Constructors

     /**

      * Specify the streams that this object will connect in the {@link #run()}

      * method.

      *

      * @param is the InputStream to read from.

      * @param os the OutputStream to write to.

      */

     public StreamConnector(InputStream is, OutputStream os) {

         this.is = is;

         this.os = os;

     }

     //----------------------------------------------------------------- Methods

     /**

      * Connect the InputStream and OutputStream objects specified in the

      * {@link #StreamConnector(InputStream, OutputStream)} constructor.

      */

     public void run() {

         // If the InputStream is null, don't do anything

         if (is == null)

             return;

         // Connect the streams until the InputStream is unreadable

         try {

             int bytesRead = 0;

             byte[] buf = new byte[4096];

             while ((bytesRead = is.read(buf)) != -1) {

                 if (os != null && bytesRead > 0) {

                     os.write(buf, 0, bytesRead);

                     os.flush();

                 }

                 yield();

             }

         } catch (IOException e) {}

     }

 }