package org.apache.maven.resolver.internal.ant;
   
   /*
    * 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.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.Parent;
  import org.apache.maven.model.Repository;
  import org.apache.maven.model.building.FileModelSource;
  import org.apache.maven.model.building.ModelSource;
  import org.apache.maven.model.resolution.InvalidRepositoryException;
  import org.apache.maven.model.resolution.ModelResolver;
  import org.apache.maven.model.resolution.UnresolvableModelException;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.artifact.DefaultArtifact;
  import org.eclipse.aether.impl.RemoteRepositoryManager;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.repository.RepositoryPolicy;
  import org.eclipse.aether.resolution.ArtifactRequest;
  import org.eclipse.aether.resolution.ArtifactResolutionException;
  
  /**
   * A model resolver to assist building of dependency POMs. This resolver gives priority to those repositories that have
   * been initially specified and repositories discovered in dependency POMs are recessively merged into the search chain.
   *
   */
  class AntModelResolver
      implements ModelResolver
  {
  
      private final RepositorySystemSession session;
  
      private final String context;
  
      private List<org.eclipse.aether.repository.RemoteRepository> repositories;
  
      private final RepositorySystem repoSys;
  
      private final RemoteRepositoryManager remoteRepositoryManager;
  
      private final Set<String> repositoryIds;
  
      AntModelResolver( RepositorySystemSession session, String context, RepositorySystem repoSys,
                               RemoteRepositoryManager remoteRepositoryManager, List<RemoteRepository> repositories )
      {
          this.session = session;
          this.context = context;
          this.repoSys = repoSys;
          this.remoteRepositoryManager = remoteRepositoryManager;
          this.repositories = repositories;
          this.repositoryIds = new HashSet<String>();
      }
  
      private AntModelResolver( AntModelResolver original )
      {
          this.session = original.session;
          this.context = original.context;
          this.repoSys = original.repoSys;
          this.remoteRepositoryManager = original.remoteRepositoryManager;
          this.repositories = original.repositories;
          this.repositoryIds = new HashSet<String>( original.repositoryIds );
      }
  
      public void addRepository( Repository repository )
          throws InvalidRepositoryException
      {
          if ( !repositoryIds.add( repository.getId() ) )
          {
              return;
          }
  
          List<RemoteRepository> newRepositories = Collections.singletonList( convert( repository ) );
  
          this.repositories =
              remoteRepositoryManager.aggregateRepositories( session, repositories, newRepositories, true );
     }
 
     static RemoteRepository convert( Repository repository )
     {
         RemoteRepository.Builder builder =
             new RemoteRepository.Builder( repository.getId(), repository.getLayout(), repository.getUrl() );
         builder.setSnapshotPolicy( convert( repository.getSnapshots() ) );
         builder.setReleasePolicy( convert( repository.getReleases() ) );
         return builder.build();
     }
 
     private static RepositoryPolicy convert( org.apache.maven.model.RepositoryPolicy policy )
     {
         boolean enabled = true;
         String checksums = RepositoryPolicy.CHECKSUM_POLICY_WARN;
         String updates = RepositoryPolicy.UPDATE_POLICY_DAILY;
 
         if ( policy != null )
         {
             enabled = policy.isEnabled();
             if ( policy.getUpdatePolicy() != null )
             {
                 updates = policy.getUpdatePolicy();
             }
             if ( policy.getChecksumPolicy() != null )
             {
                 checksums = policy.getChecksumPolicy();
             }
         }
 
         return new RepositoryPolicy( enabled, updates, checksums );
     }
 
     public ModelResolver newCopy()
     {
         return new AntModelResolver( this );
     }
 
     public ModelSource resolveModel( String groupId, String artifactId, String version )
         throws UnresolvableModelException
     {
         Artifact pomArtifact = new DefaultArtifact( groupId, artifactId, "", "pom", version );
 
         try
         {
             ArtifactRequest request = new ArtifactRequest( pomArtifact, repositories, context );
             pomArtifact = repoSys.resolveArtifact( session, request ).getArtifact();
         }
         catch ( ArtifactResolutionException e )
         {
             throw new UnresolvableModelException( "Failed to resolve POM for " + groupId + ":" + artifactId + ":"
                 + version + " due to " + e.getMessage(), groupId, artifactId, version, e );
         }
 
         File pomFile = pomArtifact.getFile();
 
         return new FileModelSource( pomFile );
     }
 
     @Override
     public ModelSource resolveModel( Parent parent )
         throws UnresolvableModelException
     {
         return resolveModel( parent.getGroupId(), parent.getArtifactId(), parent.getVersion() );
     }
 
     @Override
     public ModelSource resolveModel( Dependency dependency )
         throws UnresolvableModelException
     {
         return resolveModel( dependency.getGroupId(), dependency.getArtifactId(), dependency.getVersion() );
     }
 
     @Override
     public void addRepository( Repository repository, boolean replace )
         throws InvalidRepositoryException
     {
         addRepository( repository );
     }
 
 }