001package org.apache.maven.scm.provider.perforce.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.ScmException;
023import org.apache.maven.scm.log.ScmLogger;
024import org.apache.maven.scm.util.AbstractConsumer;
025import org.apache.regexp.RE;
026import org.apache.regexp.RESyntaxException;
027
028/**
029 * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
030 *
031 */
032public class PerforceHaveConsumer
033    extends AbstractConsumer
034{
035    private String have;
036
037    /**
038     * The regular expression used to match header lines
039     */
040    private RE revisionRegexp;
041
042    private static final String PATTERN = "^Change (\\d+) " + // changelist number
043        "on (.*) " + // date
044        "by (.*)@"; // author
045
046    public PerforceHaveConsumer( ScmLogger logger )
047    {
048        super( logger );
049
050        try
051        {
052            revisionRegexp = new RE( PATTERN );
053        }
054        catch ( RESyntaxException ignored )
055        {
056            if ( getLogger().isErrorEnabled() )
057            {
058                getLogger().error( "Could not create regexp to parse perforce log file", ignored );
059            }
060        }
061    }
062
063    public String getHave() throws ScmException
064    {
065        return have;
066    }
067
068    // ----------------------------------------------------------------------
069    // StreamConsumer Implementation
070    // ----------------------------------------------------------------------
071
072    /** {@inheritDoc} */
073    public void consumeLine( String line )
074    {
075        if( revisionRegexp.match( line ) )
076        {
077            have = revisionRegexp.getParen( 1 );
078        }
079    }
080}