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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.pmd;
20  
21  import java.io.IOException;
22  import java.nio.file.Files;
23  import java.nio.file.Paths;
24  import java.util.ArrayList;
25  import java.util.HashSet;
26  import java.util.List;
27  import java.util.Set;
28  import java.util.stream.Collectors;
29  import java.util.stream.Stream;
30  
31  import net.sourceforge.pmd.cpd.Mark;
32  import net.sourceforge.pmd.cpd.Match;
33  import org.apache.maven.plugin.MojoExecutionException;
34  import org.apache.maven.plugins.pmd.model.CpdFile;
35  import org.apache.maven.plugins.pmd.model.Duplication;
36  
37  /**
38   * This class contains utility methods to load property files which define which files
39   * should be excluded from the CPD duplication results.
40   * See property <code>pmd.excludeFromFailureFile</code>.
41   *
42   * @author Andreas Dangel
43   */
44  public class ExcludeDuplicationsFromFile implements ExcludeFromFile<Duplication> {
45  
46      private final List<Set<String>> exclusionList = new ArrayList<>();
47  
48      @Override
49      public boolean isExcludedFromFailure(final Duplication errorDetail) {
50          final Set<String> uniquePaths = new HashSet<>();
51          for (final CpdFile cpdFile : errorDetail.getFiles()) {
52              uniquePaths.add(cpdFile.getPath());
53          }
54          return isExcludedFromFailure(uniquePaths);
55      }
56  
57      /**
58       * Checks whether the given {@link Match} is excluded.
59       * Note: The exclusion must have been loaded before via {@link #loadExcludeFromFailuresData(String)}.
60       *
61       * @param errorDetail the duplication to check
62       * @return <code>true</code> if the given duplication should be excluded, <code>false</code> otherwise.
63       */
64      public boolean isExcludedFromFailure(final Match errorDetail) {
65          final Set<String> uniquePaths = new HashSet<>();
66          for (Mark mark : errorDetail.getMarkSet()) {
67              uniquePaths.add(mark.getFilename());
68          }
69          return isExcludedFromFailure(uniquePaths);
70      }
71  
72      private boolean isExcludedFromFailure(Set<String> uniquePaths) {
73          for (final Set<String> singleExclusionGroup : exclusionList) {
74              if (uniquePaths.size() == singleExclusionGroup.size()
75                      && duplicationExcludedByGroup(uniquePaths, singleExclusionGroup)) {
76                  return true;
77              }
78          }
79          return false;
80      }
81  
82      private boolean duplicationExcludedByGroup(final Set<String> uniquePaths, final Set<String> singleExclusionGroup) {
83          for (final String path : uniquePaths) {
84              if (!fileExcludedByGroup(path, singleExclusionGroup)) {
85                  return false;
86              }
87          }
88          return true;
89      }
90  
91      private boolean fileExcludedByGroup(final String path, final Set<String> singleExclusionGroup) {
92          final String formattedPath = path.replace('\\', '.').replace('/', '.');
93          for (final String className : singleExclusionGroup) {
94              if (formattedPath.contains(className)) {
95                  return true;
96              }
97          }
98          return false;
99      }
100 
101     @Override
102     public void loadExcludeFromFailuresData(final String excludeFromFailureFile) throws MojoExecutionException {
103         if (excludeFromFailureFile == null || excludeFromFailureFile.isEmpty()) {
104             return;
105         }
106 
107         try (Stream<String> lines = Files.lines(Paths.get(excludeFromFailureFile))) {
108             exclusionList.addAll(lines.filter(line -> !line.startsWith("#"))
109                     .map(line -> createSetFromExclusionLine(line))
110                     .collect(Collectors.toList()));
111         } catch (final IOException e) {
112             throw new MojoExecutionException("Cannot load file " + excludeFromFailureFile, e);
113         }
114     }
115 
116     private Set<String> createSetFromExclusionLine(final String line) {
117         final Set<String> result = new HashSet<>();
118         for (final String className : line.split(",")) {
119             result.add(className.trim());
120         }
121         return result;
122     }
123 
124     @Override
125     public int countExclusions() {
126         return exclusionList.size();
127     }
128 }