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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.maven.plugins.shade.resource;
20  
21  import java.io.ByteArrayOutputStream;
22  import java.io.IOException;
23  import java.io.InputStream;
24  import java.util.HashMap;
25  import java.util.List;
26  import java.util.Map;
27  import java.util.jar.JarEntry;
28  import java.util.jar.JarOutputStream;
29  import java.util.regex.Pattern;
30  
31  import org.apache.maven.plugins.shade.relocation.Relocator;
32  import org.codehaus.plexus.util.IOUtil;
33  
34  /**
35   * An appending transformer for resource bundles
36   *
37   * @author Robert Scholte
38   * @since 3.0.0
39   */
40  public class ResourceBundleAppendingTransformer extends AbstractCompatibilityTransformer {
41      private Map<String, ByteArrayOutputStream> dataMap = new HashMap<>();
42  
43      private Pattern resourceBundlePattern;
44  
45      private long time = Long.MIN_VALUE;
46  
47      /**
48       * the base name of the resource bundle, a fully qualified class name
49       * @param basename The basename.
50       */
51      public void setBasename(String basename) {
52          resourceBundlePattern = Pattern.compile(basename + "(_[a-zA-Z]+){0,3}\\.properties");
53      }
54  
55      @Override
56      public boolean canTransformResource(String r) {
57          return resourceBundlePattern != null && resourceBundlePattern.matcher(r).matches();
58      }
59  
60      @Override
61      public void processResource(String resource, InputStream is, List<Relocator> relocators, long time)
62              throws IOException {
63          ByteArrayOutputStream data = dataMap.get(resource);
64          if (data == null) {
65              data = new ByteArrayOutputStream();
66              dataMap.put(resource, data);
67          }
68  
69          IOUtil.copy(is, data);
70          data.write('\n');
71  
72          if (time > this.time) {
73              this.time = time;
74          }
75      }
76  
77      @Override
78      public boolean hasTransformedResource() {
79          return !dataMap.isEmpty();
80      }
81  
82      @Override
83      public void modifyOutputStream(JarOutputStream jos) throws IOException {
84          for (Map.Entry<String, ByteArrayOutputStream> dataEntry : dataMap.entrySet()) {
85              JarEntry jarEntry = new JarEntry(dataEntry.getKey());
86              jarEntry.setTime(time);
87              jos.putNextEntry(jarEntry);
88  
89              jos.write(dataEntry.getValue().toByteArray());
90              dataEntry.getValue().reset();
91          }
92      }
93  }