package org.apache.maven.index.archetype;
   
   /*
    * 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.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  
  import javax.inject.Inject;
  
  import org.apache.lucene.search.Query;
  import org.apache.maven.archetype.catalog.Archetype;
  import org.apache.maven.archetype.catalog.ArchetypeCatalog;
  import org.apache.maven.index.ArtifactInfo;
  import org.apache.maven.index.FlatSearchRequest;
  import org.apache.maven.index.FlatSearchResponse;
  import org.apache.maven.index.Indexer;
  import org.apache.maven.index.MAVEN;
  import org.apache.maven.index.context.IndexingContext;
  import org.apache.maven.index.expr.SourcedSearchExpression;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Support class to implement {@code org.apache.maven.archetype.source.ArchetypeDataSource} interface. Extend this class
   * to suit your needs.
   */
  public abstract class AbstractArchetypeDataSource
  {
  
      private final Logger logger = LoggerFactory.getLogger( getClass() );
  
      protected Logger getLogger()
      {
          return logger;
      }
  
      private final Indexer indexer;
  
  
      @Inject
      protected AbstractArchetypeDataSource( Indexer indexer )
      {
          this.indexer = indexer;
      }
  
      public ArchetypeCatalog getArchetypeCatalog( final Properties properties )
      {
          final ArchetypeCatalog catalog = new ArchetypeCatalog();
          try
          {
              final Map<String, String> repositories = getRepositoryMap();
              final Query pq =
                  indexer.constructQuery( MAVEN.PACKAGING, new SourcedSearchExpression( "maven-archetype" ) );
              final FlatSearchRequest searchRequest = new FlatSearchRequest( pq );
              searchRequest.setContexts( getIndexingContexts() );
              final FlatSearchResponse searchResponse = indexer.searchFlat( searchRequest );
              for ( ArtifactInfo info : searchResponse.getResults() )
              {
                  Archetype archetype = new Archetype();
                  archetype.setGroupId( info.getGroupId() );
                  archetype.setArtifactId( info.getArtifactId() );
                  archetype.setVersion( info.getVersion() );
                  archetype.setDescription( info.getDescription() );
                  archetype.setRepository( repositories.get( info.getRepository() ) );
                  catalog.addArchetype( archetype );
              }
          }
          catch ( Exception ex )
          {
              getLogger().error( "Unable to retrieve archetypes", ex );
          }
  
          return catalog;
      }
  
      private Map<String, String> getRepositoryMap()
      {
          // can't cache this because indexes can be changed
          Map<String, String> repositories = new HashMap<>();
  
         for ( IndexingContext context : getIndexingContexts() )
         {
             String repositoryUrl = context.getRepositoryUrl();
             if ( repositoryUrl != null )
             {
                 repositories.put( context.getId(), repositoryUrl );
             }
         }
 
         return repositories;
     }
 
     public void updateCatalog( Properties properties, Archetype archetype )
     {
         // TODO maybe update index
     }
 
     // ==
 
     protected abstract List<IndexingContext> getIndexingContexts();
 }