src/main/java/org/apache/maven/shared/downloader/DefaultDownloader.java

package org.apache.maven.shared.downloader;

/*
 * 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.util.List;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.factory.ArtifactFactory;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
import org.apache.maven.artifact.resolver.ArtifactResolutionException;
import org.apache.maven.artifact.resolver.ArtifactResolver;
import org.apache.maven.artifact.versioning.VersionRange;

/**
 * @author Jason van Zyl
 * @plexus.component
 */
public class DefaultDownloader
    implements Downloader
{
    /**
     * @plexus.requirement
     */
    private ArtifactResolver artifactResolver;

    /**
     * @plexus.requirement
     */
    private ArtifactFactory artifactFactory;

    public File download( String groupId, String artifactId, String version, File localRepository,
                          String[] remoteRepositories )
        throws DownloadException, DownloadNotFoundException
    {
        throw new RuntimeException( "Unsupported method, instead use org.apache.maven.shared.downloader."
            + "DefaultDownloader.download( String, String, String, ArtifactRepository, List )" );
    }

    public File download( String groupId, String artifactId, String version, ArtifactRepository localRepository,
                          List/* <ArtifactRepository> */remoteRepositories )
        throws DownloadException, DownloadNotFoundException
    {
        return download( groupId, artifactId, version, "jar", null, localRepository, remoteRepositories );
    }
    
    public File download( String groupId, String artifactId, String version, String type, String classifier,
                          ArtifactRepository localRepository, List/* <ArtifactRepository> */remoteRepositories )
        throws DownloadException, DownloadNotFoundException
    {
        Artifact artifact =
            artifactFactory.createDependencyArtifact( groupId, artifactId, VersionRange.createFromVersion( version ),
                                                      type, classifier, Artifact.SCOPE_RUNTIME );

        return download( artifact, localRepository, remoteRepositories );
    }
    
    private File download( Artifact artifact, ArtifactRepository localRepository,
                           List/* <ArtifactRepository> */remoteRepositories )
        throws DownloadException, DownloadNotFoundException
    {
        try
        {
            artifactResolver.resolve( artifact, remoteRepositories, localRepository );
        }
        catch ( ArtifactResolutionException e )
        {
            throw new DownloadException( "Error downloading.", e );
        }
        catch ( ArtifactNotFoundException e )
        {
            throw new DownloadNotFoundException( "Requested download does not exist.", e );
        }

        return artifact.getFile();    
    }
}