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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 org.apache.maven.plugins.shade.relocation.Relocator;
23  import org.codehaus.plexus.util.IOUtil;
24  
25  import java.io.ByteArrayInputStream;
26  import java.io.ByteArrayOutputStream;
27  import java.io.IOException;
28  import java.io.InputStream;
29  import java.util.List;
30  import java.util.jar.JarEntry;
31  import java.util.jar.JarOutputStream;
32  
33  /**
34   * A resource processor that appends content for a resource, separated by a newline.
35   */
36  public class AppendingTransformer
37      implements ResourceTransformer
38  {
39      String resource;
40  
41      ByteArrayOutputStream data = new ByteArrayOutputStream();
42  
43      public boolean canTransformResource( String r )
44      {
45          if ( resource != null && resource.equalsIgnoreCase( r ) )
46          {
47              return true;
48          }
49  
50          return false;
51      }
52  
53      public void processResource( String resource, InputStream is, List<Relocator> relocators )
54          throws IOException
55      {
56          IOUtil.copy( is, data );
57          data.write( '\n' );
58  
59          is.close();
60      }
61  
62      public boolean hasTransformedResource()
63      {
64          return data.size() > 0;
65      }
66  
67      public void modifyOutputStream( JarOutputStream jos )
68          throws IOException
69      {
70          jos.putNextEntry( new JarEntry( resource ) );
71  
72          IOUtil.copy( new ByteArrayInputStream( data.toByteArray() ), jos );
73          data.reset();
74      }
75  }