ClasspathUtils.java

/*
 * Sonatype Application Build Lifecycle
 * Copyright (C) 2009 Sonatype, Inc.                                                                                                                          
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 */
package com.redhat.tools.nexus.maven.plugin;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.util.IOUtil;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Properties;
import java.util.Set;

/**
 * Utility methods to read and write a mapping document for non-plugin dependency artifacts used in an application
 * plugin.
 * 
 * @author jdcasey
 * 
 */
public final class ClasspathUtils
{

    private static final String CP_PROPSFILE = "classpath.properties";

    private ClasspathUtils()
    {
    }

    public static Properties read( final MavenProject project )
        throws IOException
    {
        File cpFile = new File( project.getBuild().getDirectory(), CP_PROPSFILE );
        if ( !cpFile.exists() )
        {
            throw new IOException( "Cannot find: " + cpFile + ". Did you call 'generate-metadata'?" );
        }

        Properties p = new Properties();
        FileInputStream stream = null;
        try
        {
            stream = new FileInputStream( cpFile );
            p.load( stream );
        }
        finally
        {
            IOUtil.close( stream );
        }

        return p;
    }

    public static void write( final Set<Artifact> classpathArtifacts, final MavenProject project )
        throws IOException
    {
        Properties p = new Properties();

        for ( Artifact artifact : classpathArtifacts )
        {
            File artifactFile = artifact.getFile();

            StringBuilder fname = new StringBuilder();
            fname.append( artifact.getArtifactId() ).append( '-' ).append( artifact.getVersion() );

            if ( artifact.getClassifier() != null )
            {
                fname.append( '-' ).append( artifact.getClassifier() );
            }

            fname.append( '.' ).append( artifact.getArtifactHandler().getExtension() );

            p.setProperty( fname.toString(), artifactFile.getAbsolutePath() );
        }

        File cpFile = new File( project.getBuild().getDirectory(), CP_PROPSFILE );
        FileOutputStream stream = null;
        try
        {
            cpFile.getParentFile().mkdirs();
            stream = new FileOutputStream( cpFile );

            p.store( stream, "Written on: " + new Date() );
        }
        finally
        {
            IOUtil.close( stream );
        }
    }

}