Maven2ArtifactViewProvider.java

/**
 * Copyright (c) 2008-2011 Sonatype, Inc.
 * All rights reserved. Includes the third-party code listed at http://www.sonatype.com/products/nexus/attributions.
 *
 * This program is free software: you can redistribute it and/or modify it only under the terms of the GNU Affero General
 * Public License Version 3 as published by the Free Software Foundation.
 *
 * 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 Affero General Public License Version 3
 * for more details.
 *
 * You should have received a copy of the GNU Affero General Public License Version 3 along with this program.  If not, see
 * http://www.gnu.org/licenses.
 *
 * Sonatype Nexus (TM) Open Source Version is available from Sonatype, Inc. Sonatype and Sonatype Nexus are trademarks of
 * Sonatype, Inc. Apache Maven is a trademark of the Apache Foundation. M2Eclipse is a trademark of the Eclipse Foundation.
 * All other trademarks are the property of their respective owners.
 */
package org.sonatype.nexus.rest.artifact;

import java.io.IOException;

import org.apache.maven.index.artifact.Gav;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.util.StringUtils;
import org.restlet.data.Request;
import org.sonatype.nexus.proxy.ResourceStoreRequest;
import org.sonatype.nexus.proxy.item.RepositoryItemUid;
import org.sonatype.nexus.proxy.item.StorageItem;
import org.sonatype.nexus.proxy.maven.MavenRepository;
import org.sonatype.nexus.proxy.repository.Repository;
import org.sonatype.nexus.rest.AbstractArtifactViewProvider;
import org.sonatype.nexus.rest.ArtifactViewProvider;
import org.sonatype.nexus.rest.model.Maven2ArtifactInfoResource;
import org.sonatype.nexus.rest.model.Maven2ArtifactInfoResourceRespose;

/**
 * Returns Maven2 artifact information.
 * 
 * @author Brian Demers
 * @author cstamas
 */
@Component( role = ArtifactViewProvider.class, hint = "maven2" )
public class Maven2ArtifactViewProvider
    extends AbstractArtifactViewProvider
{
    public Object retrieveView( ResourceStoreRequest request, RepositoryItemUid itemUid, StorageItem item, Request req )
        throws IOException
    {
        final Repository itemRepository = itemUid.getRepository();

        final String itemPath = itemUid.getPath();

        // is this a MavenRepository at all? If not, this view is not applicable
        if ( !itemRepository.getRepositoryKind().isFacetAvailable( MavenRepository.class ) )
        {
            // this items comes from a non-maven repository, this view is not applicable
            return null;
        }
        else
        {
            // we need maven repository for this operation, but we actually don't care is this
            // maven2 or mave1 repository! Let's handle this in generic way.
            MavenRepository mavenRepository = itemRepository.adaptToFacet( MavenRepository.class );

            // use maven repository's corresponding GavCalculator instead of "wired in" one!
            Gav gav = mavenRepository.getGavCalculator().pathToGav( itemPath );

            if ( gav == null || gav.isSignature() || gav.isHash() )
            {
                // if we cannot calculate the gav, it is not a maven artifact (or hash/sig), return null;
                return null;
            }

            // if we are here, we have GAV, so just pack it and send it back
            Maven2ArtifactInfoResourceRespose response = new Maven2ArtifactInfoResourceRespose();
            Maven2ArtifactInfoResource data = new Maven2ArtifactInfoResource();
            response.setData( data );

            data.setGroupId( gav.getGroupId() );
            data.setArtifactId( gav.getArtifactId() );
            data.setBaseVersion( gav.getBaseVersion() );
            data.setVersion( gav.getVersion() );
            data.setExtension( gav.getExtension() );
            data.setClassifier( gav.getClassifier() );

            data.setDependencyXmlChunk( generateDependencyXml( gav ) );

            return response;
        }
    }

    private String generateDependencyXml( Gav gav )
    {
        StringBuilder buffer = new StringBuilder();

        buffer.append( "<dependency>\n" );
        buffer.append( "  <groupId>" ).append( gav.getGroupId() ).append( "</groupId>\n" );
        buffer.append( "  <artifactId>" ).append( gav.getArtifactId() ).append( "</artifactId>\n" );
        buffer.append( "  <version>" ).append( gav.getBaseVersion() ).append( "</version>\n" );

        if ( StringUtils.isNotEmpty( gav.getClassifier() ) )
        {
            buffer.append( "  <classifier>" ).append( gav.getClassifier() ).append( "</classifier>\n" );
        }

        if ( StringUtils.isNotEmpty( gav.getExtension() ) && !StringUtils.equalsIgnoreCase( "jar", gav.getExtension() ) )
        {
            buffer.append( "  <type>" ).append( gav.getExtension() ).append( "</type>\n" );
        }

        buffer.append( "</dependency>" );

        return buffer.toString();
    }

}