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1   package org.apache.maven.plugins.shade.resource;
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.ByteArrayInputStream;
23  import java.io.ByteArrayOutputStream;
24  import java.io.IOException;
25  import java.io.InputStream;
26  import java.util.List;
27  import java.util.jar.JarEntry;
28  import java.util.jar.JarOutputStream;
29  
30  import org.codehaus.plexus.util.IOUtil;
31  
32  /**
33   * A resource processor that appends content for a resource, separated by a newline.
34   * 
35   */
36  public class AppendingTransformer
37      implements ResourceTransformer
38  {
39      String resource;
40      ByteArrayOutputStream data = new ByteArrayOutputStream();
41  
42      public boolean canTransformResource( String r )
43      {
44          if ( resource != null && resource.equalsIgnoreCase( r ) )
45          {
46              return true;
47          }
48  
49          return false;
50      }
51  
52      public void processResource( String resource, InputStream is, List relocators )
53          throws IOException
54      {
55          IOUtil.copy( is, data );
56          data.write( '\n' );
57  
58          is.close();
59      }
60  
61      public boolean hasTransformedResource()
62      {
63          return data.size() > 0;
64      }
65  
66      public void modifyOutputStream( JarOutputStream jos )
67          throws IOException
68      {
69          jos.putNextEntry( new JarEntry( resource ) );
70  
71          IOUtil.copy( new ByteArrayInputStream( data.toByteArray() ), jos );
72          data.reset();
73      }
74  }