1 package org.apache.maven.scm.provider.git.gitexe.command.update;
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.log.ScmLogger;
23 import org.apache.maven.scm.util.AbstractConsumer;
24 import org.apache.regexp.RE;
25 import org.apache.regexp.RESyntaxException;
26 import org.codehaus.plexus.util.StringUtils;
27
28 /**
29 * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
30 *
31 */
32 public class GitLatestRevisionCommandConsumer
33 extends AbstractConsumer
34 {
35
36 /**
37 * The pattern used to match git log latest revision lines
38 */
39 private static final String LATESTREV_PATTERN = "^commit \\s*(.*)";
40
41 /**
42 * The regular expression used to match git log latest revision lines
43 */
44 private RE latestRevRegexp;
45
46 private String latestRevision;
47
48 public GitLatestRevisionCommandConsumer( ScmLogger logger )
49 {
50 super( logger );
51
52 try
53 {
54 latestRevRegexp = new RE( LATESTREV_PATTERN );
55 }
56 catch ( RESyntaxException ex )
57 {
58 throw new RuntimeException( "INTERNAL ERROR: Could not create regexp to parse git log file. This shouldn't happen. "
59 + "Something is probably wrong with the oro installation.",
60 ex );
61 }
62
63 }
64
65 /** {@inheritDoc} */
66 public void consumeLine( String line )
67 {
68 if ( getLogger().isDebugEnabled() )
69 {
70 getLogger().debug( "GitLatestRevisionCommandConsumer consumeLine : " + line );
71 }
72 if ( line == null || StringUtils.isEmpty( line ) )
73 {
74 return;
75 }
76
77 processGetLatestRevision( line );
78 }
79
80 public String getLatestRevision()
81 {
82 return latestRevision;
83 }
84
85 /**
86 * Process the current input line for the latest revision
87 *
88 * @param line A line of text from the git log output
89 */
90 private void processGetLatestRevision( String line )
91 {
92 if ( !latestRevRegexp.match( line ) )
93 {
94 return;
95 }
96
97 latestRevision = latestRevRegexp.getParen( 1 );
98 }
99
100 }