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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.IOException;
23  import java.io.InputStream;
24  import java.util.List;
25  import java.util.jar.JarOutputStream;
26  
27  import org.apache.maven.plugins.shade.relocation.Relocator;
28  
29  /**
30   * Prevents duplicate copies of the license
31   */
32  public class ApacheLicenseResourceTransformer
33      extends AbstractCompatibilityTransformer
34  {
35      private static final String LICENSE_PATH = "META-INF/LICENSE";
36  
37      private static final String LICENSE_TXT_PATH = "META-INF/LICENSE.txt";
38      
39      private static final String LICENSE_MD_PATH = "META-INF/LICENSE.md";
40  
41      public boolean canTransformResource( String resource )
42      {
43          return LICENSE_PATH.equalsIgnoreCase( resource )
44              || LICENSE_TXT_PATH.regionMatches( true, 0, resource, 0, LICENSE_TXT_PATH.length() )
45              || LICENSE_MD_PATH.regionMatches( true, 0, resource, 0, LICENSE_MD_PATH.length() );
46      }
47  
48      public void processResource( String resource, InputStream is, List<Relocator> relocators, long time )
49          throws IOException
50      {
51          // no op
52      }
53  
54      public boolean hasTransformedResource()
55      {
56          return false;
57      }
58  
59      public void modifyOutputStream( JarOutputStream os )
60          throws IOException
61      {
62          // no op
63      }
64  }