001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.maven.scm.provider.git.gitexe.command.update;
020
021import java.util.regex.Matcher;
022import java.util.regex.Pattern;
023
024import org.apache.maven.scm.util.AbstractConsumer;
025
026/**
027 * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
028 *
029 */
030public class GitLatestRevisionCommandConsumer extends AbstractConsumer {
031
032    /**
033     * The pattern used to match git log latest revision lines
034     */
035    private static final Pattern LATESTREV_PATTERN = Pattern.compile("^commit \\s*(.*)");
036
037    private String latestRevision;
038
039    /** {@inheritDoc} */
040    public void consumeLine(String line) {
041        if (logger.isDebugEnabled()) {
042            logger.debug("GitLatestRevisionCommandConsumer consumeLine : " + line);
043        }
044        if (line == null || (line == null || line.isEmpty())) {
045            return;
046        }
047
048        processGetLatestRevision(line);
049    }
050
051    public String getLatestRevision() {
052        return latestRevision;
053    }
054
055    /**
056     * Process the current input line for the latest revision
057     *
058     * @param line A line of text from the git log output
059     */
060    private void processGetLatestRevision(String line) {
061        Matcher matcher = LATESTREV_PATTERN.matcher(line);
062        if (matcher.matches()) {
063            latestRevision = matcher.group(1);
064        }
065    }
066}