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