package org.apache.maven.plugin.surefire.booterclient.lazytestprovider;

 /*

  * 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.OutputStream;

 import org.apache.maven.shared.utils.cli.CommandLineException;

 import org.apache.maven.shared.utils.cli.Commandline;

 /**

  * A {@link Commandline} implementation that provides the output stream of

  * the executed process in form of a {@link FlushReceiver}, for it to be

  * flushed on demand.

  *

  * @author Andreas Gudian

  */

 public class OutputStreamFlushableCommandline

     extends Commandline

     implements FlushReceiverProvider

 {

     /**

      * Wraps an output stream in order to delegate a flush.

      */

     private final class OutputStreamFlushReceiver

         implements FlushReceiver

     {

         private final OutputStream outputStream;

         private OutputStreamFlushReceiver( OutputStream outputStream )

         {

             this.outputStream = outputStream;

         }

         public void flush()

             throws IOException

         {

             outputStream.flush();

         }

     }

     private FlushReceiver flushReceiver;

     @Override

     public Process execute()

         throws CommandLineException

     {

         Process process = super.execute();

         if ( process.getOutputStream() != null )

         {

             flushReceiver = new OutputStreamFlushReceiver( process.getOutputStream() );

         }

         return process;

     }

     /* (non-Javadoc)

       * @see org.apache.maven.plugin.surefire.booterclient.lazytestprovider.FlushReceiverProvider#getFlushReceiver()

       */

     public FlushReceiver getFlushReceiver()

     {

         return flushReceiver;

     }

 }