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1   package org.apache.maven.plugin.surefire.booterclient.lazytestprovider;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.io.IOException;
23  import java.io.OutputStream;
24  import org.apache.maven.shared.utils.cli.CommandLineException;
25  import org.apache.maven.shared.utils.cli.Commandline;
26  
27  /**
28   * A {@link Commandline} implementation that provides the output stream of
29   * the executed process in form of a {@link FlushReceiver}, for it to be
30   * flushed on demand.
31   *
32   * @author Andreas Gudian
33   */
34  public class OutputStreamFlushableCommandline
35      extends Commandline
36      implements FlushReceiverProvider
37  {
38      /**
39       * Wraps an output stream in order to delegate a flush.
40       */
41      private final class OutputStreamFlushReceiver
42          implements FlushReceiver
43      {
44          private final OutputStream outputStream;
45  
46          private OutputStreamFlushReceiver( OutputStream outputStream )
47          {
48              this.outputStream = outputStream;
49          }
50  
51          public void flush()
52              throws IOException
53          {
54              outputStream.flush();
55          }
56      }
57  
58      private FlushReceiver flushReceiver;
59  
60      @Override
61      public Process execute()
62          throws CommandLineException
63      {
64          Process process = super.execute();
65  
66          if ( process.getOutputStream() != null )
67          {
68              flushReceiver = new OutputStreamFlushReceiver( process.getOutputStream() );
69          }
70  
71          return process;
72      }
73  
74      public FlushReceiver getFlushReceiver()
75      {
76          return flushReceiver;
77      }
78  
79  }