SimpleArtifactGenerator.java

package org.apache.maven.indexer.examples;

/*
 * 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.
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import org.apache.maven.model.Model;
import org.apache.maven.model.io.DefaultModelWriter;
import org.apache.maven.model.io.ModelWriter;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

/**
 * @author mtodorov
 */
public class SimpleArtifactGenerator
{


    public SimpleArtifactGenerator()
    {
        // no op
    }

    public File generateArtifact( String repositoryBasedir,
                                  String groupId,
                                  String artifactId,
                                  String version,
                                  String classifier,
                                  String extension )
            throws IOException, NoSuchAlgorithmException, XmlPullParserException
    {
        File repositoryDir = new File( repositoryBasedir );
        File artifactFile = new File( repositoryDir,
                                      groupId.replaceAll( "\\.", File.separator ) + File.separatorChar +
                                      artifactId + File.separatorChar + version + File.separatorChar +
                                      artifactId + "-" + version +
                                      ( classifier != null ? "-" + classifier + File.separatorChar : "" ) + "." +
                                      extension );

        if ( !artifactFile.getParentFile().exists() )
        {
            //noinspection ResultOfMethodCallIgnored
            artifactFile.getParentFile().mkdirs();
        }

        createArchive( artifactFile, groupId, artifactId, version, extension );

        return artifactFile;
    }

    private void createArchive( File artifactFile,
                                String groupId,
                                String artifactId,
                                String version,
                                String extension )
            throws NoSuchAlgorithmException,
                   IOException, XmlPullParserException
    {
        ZipOutputStream zos = null;

        try
        {
            // Make sure the artifact's parent directory exists before writing the model.
            //noinspection ResultOfMethodCallIgnored
            artifactFile.getParentFile().mkdirs();

            File pomFile = new File( artifactFile.getParent(),
                                     artifactFile.getName().substring( 0, artifactFile.getName().lastIndexOf( "." ) ) +
                                     ".pom" );

            zos = new ZipOutputStream( new FileOutputStream( artifactFile ) );

            generatePom( pomFile, groupId, artifactId, version, extension );

            addMavenPomFile( zos, pomFile, groupId, artifactId );
        }
        finally
        {
            if ( zos != null )
            {
                zos.close();
            }
        }
    }

    protected void generatePom( File pomFile,
                                String groupId,
                                String artifactId,
                                String version,
                                String type )
            throws IOException,
                   XmlPullParserException,
                   NoSuchAlgorithmException
    {

        // Make sure the artifact's parent directory exists before writing the model.
        //noinspection ResultOfMethodCallIgnored
        pomFile.getParentFile().mkdirs();

        Model model = new Model();
        model.setGroupId( groupId );
        model.setArtifactId( artifactId );
        model.setVersion( version );
        model.setPackaging( type ); // This is not exactly correct.

        ModelWriter writer = new DefaultModelWriter();
        writer.write( pomFile, null, model );

    }


    private void addMavenPomFile( ZipOutputStream zos,
                                  File pomFile,
                                  String groupId,
                                  String artifactId )
            throws IOException
    {
        ZipEntry ze = new ZipEntry( "META-INF/maven/" + groupId + "/" + artifactId + "/" + "pom.xml" );
        zos.putNextEntry( ze );

        FileInputStream fis = new FileInputStream( pomFile );

        byte[] buffer = new byte[ 1024 ];
        int len;
        while ( ( len = fis.read( buffer ) ) > 0 )
        {
            zos.write( buffer, 0, len );
        }

        fis.close();
        zos.closeEntry();
    }

    public static String convertGAVToPath( String groupId,
                                           String artifactId,
                                           String version,
                                           String classifier,
                                           String extension )
    {
        String path = "";

        path += groupId.replaceAll( "\\.", "/" ) + "/";
        path += artifactId + "/";
        path += version + "/";
        path += artifactId + "-";
        path += version;
        path += classifier != null ? "-" + classifier : "";
        path += "." + extension;

        return path;
    }

}