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1   package org.apache.maven.plugin.ant;
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 org.apache.tools.ant.BuildException;
23  import org.apache.tools.ant.ExitException;
24  import org.apache.tools.ant.Main;
25  import org.apache.tools.ant.util.optional.NoExitSecurityManager;
26  import org.codehaus.plexus.util.StringUtils;
27  
28  import java.io.ByteArrayOutputStream;
29  import java.io.File;
30  import java.io.OutputStream;
31  import java.io.PrintStream;
32  import java.util.Properties;
33  
34  /**
35   * Wrap <code>Ant</code> call.
36   *
37   * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a>
38   * @version $Id: AntWrapper.java 1517969 2013-08-27 20:14:02Z krosenvold $
39   */
40  public class AntWrapper
41  {
42      /**
43       * Invoke <code>Ant</code> for the default target of a given build file.
44       *
45       * @param antBuild an <code>Ant build</code> file
46       * @throws IllegalArgumentException if any
47       * @throws BuildException           if any
48       */
49      public static void invoke( File antBuild )
50          throws BuildException, IllegalArgumentException
51      {
52          if ( !antBuild.exists() )
53          {
54              throw new IllegalArgumentException( "antBuild should exist" );
55          }
56          if ( !antBuild.isFile() )
57          {
58              throw new IllegalArgumentException( "antBuild should be a file" );
59          }
60  
61          // ----------------------------------------------------------------------
62          // NB: By using org.apache.tools.ant.launch.Launcher, we have:
63          // java.lang.ClassCastException
64          //     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:245)
65          // So, using org.apache.tools.ant.Main#main()
66          // ----------------------------------------------------------------------
67  
68          Properties oldSystemProperties = System.getProperties();
69  
70          System.setProperty( "basedir", antBuild.getParentFile().getAbsolutePath() );
71  
72          SecurityManager oldSm = System.getSecurityManager();
73          System.setSecurityManager( new NoExitSecurityManager() );
74  
75          PrintStream oldErr = System.err;
76          OutputStream errOS = new ByteArrayOutputStream();
77          PrintStream err = new PrintStream( errOS );
78          System.setErr( err );
79  
80          PrintStream oldOut = System.out;
81          OutputStream outOS = new ByteArrayOutputStream();
82          PrintStream out = new PrintStream( outOS );
83          System.setOut( out );
84  
85          // ----------------------------------------------------------------------
86          // To prevent Javac exception i.e. "Unable to find a javac compiler"
87          // Ant can use the same command line arguments as the javac of the current VM
88          // ----------------------------------------------------------------------
89          System.setProperty( "build.compiler", "extJavac" );
90  
91          try
92          {
93              Main.main( new String[]{ "-f", antBuild.getAbsolutePath() } );
94          }
95          catch ( ExitException e )
96          {
97              if ( StringUtils.isNotEmpty( errOS.toString() ) )
98              {
99                  throw new BuildException(
100                     "Error in the Ant build file. \n= Ant output =\n" + outOS.toString() + "\n" + errOS.toString() );
101             }
102         }
103         finally
104         {
105             System.setSecurityManager( oldSm );
106             System.setErr( oldErr );
107             System.setOut( oldOut );
108             System.setProperties( oldSystemProperties );
109         }
110     }
111 }