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1   package org.apache.maven.scm.provider.svn.command.diff;
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.scm.ScmFile;
23  import org.apache.maven.scm.ScmFileStatus;
24  import org.apache.maven.scm.log.ScmLogger;
25  import org.codehaus.plexus.util.cli.StreamConsumer;
26  
27  import java.io.File;
28  import java.util.ArrayList;
29  import java.util.HashMap;
30  import java.util.List;
31  import java.util.Map;
32  
33  /**
34   * @author <a href="mailto:brett@apache.org">Brett Porter</a>
35   * @author Olivier Lamy
36   *
37   */
38  public class SvnDiffConsumer
39      implements StreamConsumer
40  {
41      //
42      // Index: plugin.jelly
43      // ===================================================================
44      // --- plugin.jelly        (revision 124799)
45      // +++ plugin.jelly        (working copy)
46      //
47  
48      private static final String INDEX_TOKEN = "Index: ";
49  
50      private static final String FILE_SEPARATOR_TOKEN = "===";
51  
52      private static final String START_REVISION_TOKEN = "---";
53  
54      private static final String END_REVISION_TOKEN = "+++";
55  
56      private static final String ADDED_LINE_TOKEN = "+";
57  
58      private static final String REMOVED_LINE_TOKEN = "-";
59  
60      private static final String UNCHANGED_LINE_TOKEN = " ";
61  
62      private static final String CHANGE_SEPARATOR_TOKEN = "@@";
63  
64      private static final String NO_NEWLINE_TOKEN = "\\ No newline at end of file";
65  
66      private ScmLogger logger;
67  
68      private String currentFile;
69  
70      private StringBuilder currentDifference;
71  
72      private List<ScmFile> changedFiles = new ArrayList<ScmFile>();
73  
74      private Map<String,CharSequence> differences = new HashMap<String,CharSequence>();
75  
76      private StringBuilder patch = new StringBuilder();
77  
78      // ----------------------------------------------------------------------
79      //
80      // ----------------------------------------------------------------------
81  
82      public SvnDiffConsumer( ScmLogger logger, File workingDirectory )
83      {
84          this.logger = logger;
85      }
86  
87      // ----------------------------------------------------------------------
88      // StreamConsumer Implementation
89      // ----------------------------------------------------------------------
90  
91      /** {@inheritDoc} */
92      public void consumeLine( String line )
93      {
94          if ( line.startsWith( INDEX_TOKEN ) )
95          {
96              // start a new file
97              currentFile = line.substring( INDEX_TOKEN.length() );
98  
99              changedFiles.add( new ScmFile( currentFile, ScmFileStatus.MODIFIED ) );
100 
101             currentDifference = new StringBuilder();
102 
103             differences.put( currentFile, currentDifference );
104 
105             patch.append( line ).append( "\n" );
106 
107             return;
108         }
109 
110         if ( currentFile == null )
111         {
112             if ( logger.isWarnEnabled() )
113             {
114                 logger.warn( "Unparseable line: '" + line + "'" );
115             }
116             patch.append( line ).append( "\n" );
117             return;
118         }
119 
120         if ( line.startsWith( FILE_SEPARATOR_TOKEN ) )
121         {
122             // skip
123             patch.append( line ).append( "\n" );
124         }
125         else if ( line.startsWith( START_REVISION_TOKEN ) )
126         {
127             // skip, though could parse to verify filename, start revision
128             patch.append( line ).append( "\n" );
129         }
130         else if ( line.startsWith( END_REVISION_TOKEN ) )
131         {
132             // skip, though could parse to verify filename, end revision
133             patch.append( line ).append( "\n" );
134         }
135         else if ( line.startsWith( ADDED_LINE_TOKEN ) || line.startsWith( REMOVED_LINE_TOKEN )
136             || line.startsWith( UNCHANGED_LINE_TOKEN ) || line.startsWith( CHANGE_SEPARATOR_TOKEN )
137             || line.equals( NO_NEWLINE_TOKEN ) )
138         {
139             // add to buffer
140             currentDifference.append( line ).append( "\n" );
141             patch.append( line ).append( "\n" );
142         }
143         else
144         {
145             // TODO: handle property differences
146 
147             if ( logger.isWarnEnabled() )
148             {
149                 logger.warn( "Unparseable line: '" + line + "'" );
150             }
151             patch.append( line ).append( "\n" );
152             // skip to next file
153             currentFile = null;
154             currentDifference = null;
155         }
156     }
157 
158     public List<ScmFile> getChangedFiles()
159     {
160         return changedFiles;
161     }
162 
163     public Map<String,CharSequence> getDifferences()
164     {
165         return differences;
166     }
167 
168     public String getPatch()
169     {
170         return patch.toString();
171     }
172 
173 }