001package org.apache.maven.plugins.enforcer;
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.artifact.versioning.DefaultArtifactVersion;
023import org.apache.maven.enforcer.rule.api.EnforcerRuleException;
024import org.apache.maven.enforcer.rule.api.EnforcerRuleHelper;
025import org.apache.maven.execution.MavenSession;
026import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
027
028/**
029 * This rule checks that the Maven version is allowed.
030 *
031 * @author <a href="mailto:brianf@apache.org">Brian Fox</a>
032 */
033public class RequireMavenVersion
034    extends AbstractVersionEnforcer
035{
036    @Override
037    public void execute( EnforcerRuleHelper helper )
038        throws EnforcerRuleException
039    {
040        try
041        {
042            MavenSession mavenSession = (MavenSession) helper.evaluate( "${session}" );
043            String mavenVersion = mavenSession.getSystemProperties().getProperty( "maven.version" );
044            helper.getLog().debug( "Detected Maven Version: " + mavenVersion );
045            if ( mavenVersion == null )
046            {
047                throw new EnforcerRuleException(
048                        "Unable to detect Maven Version - missing system property - maven.version" );
049            }
050            DefaultArtifactVersion detectedVersion = new DefaultArtifactVersion( mavenVersion );
051            enforceVersion( helper.getLog(), "Maven", getVersion(), detectedVersion );
052        }
053        catch ( ExpressionEvaluationException e )
054        {
055            throw new EnforcerRuleException( "Unable to retrieve the session.", e );
056        }
057
058    }
059
060}