package org.apache.maven.shared.dependency.graph.internal;

 /*

  * 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 org.apache.maven.artifact.resolver.filter.ArtifactFilter;

 import org.apache.maven.project.MavenProject;

 import org.apache.maven.shared.dependency.graph.DependencyGraphBuilder;

 import org.apache.maven.shared.dependency.graph.DependencyGraphBuilderException;

 import org.apache.maven.shared.dependency.graph.DependencyNode;

 import org.codehaus.plexus.PlexusConstants;

 import org.codehaus.plexus.PlexusContainer;

 import org.codehaus.plexus.component.annotations.Component;

 import org.codehaus.plexus.component.repository.exception.ComponentLookupException;

 import org.codehaus.plexus.context.Context;

 import org.codehaus.plexus.context.ContextException;

 import org.codehaus.plexus.logging.AbstractLogEnabled;

 import org.codehaus.plexus.personality.plexus.lifecycle.phase.Contextualizable;

 /**

  * Default dependency graph builder that detects current Maven version to delegate to either

  * Maven 2 or Maven 3 specific code.

  *

  * @see Maven2DependencyGraphBuilder

  * @see Maven3DependencyGraphBuilder

  * @author Hervé Boutemy

  * @since 2.0

  */

 @Component( role = DependencyGraphBuilder.class )

 public class DefaultDependencyGraphBuilder

     extends AbstractLogEnabled

     implements DependencyGraphBuilder, Contextualizable

 {

     protected PlexusContainer container;

     public DependencyNode buildDependencyGraph( MavenProject project, ArtifactFilter filter )

         throws DependencyGraphBuilderException

     {

         try

         {

             String hint = isMaven2x() ? "maven2" : "maven3";

             getLogger().debug( "building " + hint + " dependency graph for " + project.getId() );

             DependencyGraphBuilder effectiveGraphBuilder =

                 (DependencyGraphBuilder) container.lookup( DependencyGraphBuilder.class.getCanonicalName(), hint );

             return effectiveGraphBuilder.buildDependencyGraph( project, filter );

         }

         catch ( ComponentLookupException e )

         {

             throw new DependencyGraphBuilderException( e.getMessage(), e );

         }

     }

     /**

      * Check the current Maven version to see if it's Maven 2.x.

      */

     protected static boolean isMaven2x()

     {

         try

         {

             Class.forName( "org.apache.maven.project.DependencyResolutionRequest" ); // Maven 3 specific

             return false;

         }

         catch ( ClassNotFoundException e )

         {

             return true;

         }

     }

     public void contextualize( Context context )

         throws ContextException

     {

         container = (PlexusContainer) context.get( PlexusConstants.PLEXUS_KEY );

     }

 }