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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.scm.provider.git.gitexe.command.update;
20  
21  import java.util.regex.Matcher;
22  import java.util.regex.Pattern;
23  
24  import org.apache.maven.scm.util.AbstractConsumer;
25  
26  /**
27   * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
28   *
29   */
30  public class GitLatestRevisionCommandConsumer extends AbstractConsumer {
31  
32      /**
33       * The pattern used to match git log latest revision lines
34       */
35      private static final Pattern LATESTREV_PATTERN = Pattern.compile("^commit \\s*(.*)");
36  
37      private String latestRevision;
38  
39      /** {@inheritDoc} */
40      public void consumeLine(String line) {
41          if (logger.isDebugEnabled()) {
42              logger.debug("GitLatestRevisionCommandConsumer consumeLine : " + line);
43          }
44          if (line == null || (line == null || line.isEmpty())) {
45              return;
46          }
47  
48          processGetLatestRevision(line);
49      }
50  
51      public String getLatestRevision() {
52          return latestRevision;
53      }
54  
55      /**
56       * Process the current input line for the latest revision
57       *
58       * @param line A line of text from the git log output
59       */
60      private void processGetLatestRevision(String line) {
61          Matcher matcher = LATESTREV_PATTERN.matcher(line);
62          if (matcher.matches()) {
63              latestRevision = matcher.group(1);
64          }
65      }
66  }