org.apache.maven.mae.conf.MavenPomVersionProvider Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.maven.mae.conf;

import org.apache.log4j.Logger;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public final class MavenPomVersionProvider
    implements VersionProvider
{

    private static final Logger logger = Logger.getLogger( MAEConfiguration.STANDARD_LOG_HANDLE_LOADER );

    private final String groupId;

    private final String artifactId;

    private String version;

    public MavenPomVersionProvider( final String groupId, final String artifactId )
    {
        this.groupId = groupId;
        this.artifactId = artifactId;
    }

    public final synchronized String getVersion()
    {
        if ( version == null )
        {
            final String path = "META-INF/maven/" + groupId + "/" + artifactId + "/pom.properties";
            final InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream( path );

            if ( stream != null )
            {
                final Properties p = new Properties();
                try
                {
                    p.load( stream );
                    version = p.getProperty( "version" );
                }
                catch ( final IOException e )
                {
                    if ( logger.isDebugEnabled() )
                    {
                        logger.debug( "Failed to load version for: " + groupId + ":" + artifactId );
                    }
                }
            }

            if ( version == null )
            {
                version = "-UNKNOWN-";
            }
        }

        return version;
    }

}