001package org.apache.maven.scm.provider.git.gitexe.command.update;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *   http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import org.apache.maven.scm.log.ScmLogger;
023import org.apache.maven.scm.util.AbstractConsumer;
024import org.codehaus.plexus.util.StringUtils;
025
026import java.util.regex.Matcher;
027import java.util.regex.Pattern;
028
029/**
030 * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
031 *
032 */
033public class GitLatestRevisionCommandConsumer
034    extends AbstractConsumer
035{
036
037    /**
038     * The pattern used to match git log latest revision lines
039     */
040    private static final Pattern LATESTREV_PATTERN = Pattern.compile( "^commit \\s*(.*)" );
041
042    private String latestRevision;
043
044    public GitLatestRevisionCommandConsumer( ScmLogger logger )
045    {
046        super( logger );
047    }
048
049    /** {@inheritDoc} */
050    public void consumeLine( String line )
051    {
052        if ( getLogger().isDebugEnabled() )
053        {
054            getLogger().debug( "GitLatestRevisionCommandConsumer consumeLine : " + line );
055        }
056        if ( line == null || StringUtils.isEmpty( line ) )
057        {
058            return;
059        }
060
061        processGetLatestRevision( line );
062    }
063
064    public String getLatestRevision()
065    {
066        return latestRevision;
067    }
068
069    /**
070     * Process the current input line for the latest revision
071     *
072     * @param line A line of text from the git log output
073     */
074    private void processGetLatestRevision( String line )
075    {
076        Matcher matcher = LATESTREV_PATTERN.matcher( line );
077        if ( matcher.matches() )
078        {
079            latestRevision = matcher.group( 1 );
080
081        }
082    }
083
084}