package org.apache.maven.index;
   
   /*
    * 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 javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import org.apache.lucene.queryparser.classic.ParseException;
  import org.apache.lucene.search.Query;
  import org.apache.lucene.store.Directory;
  import org.apache.lucene.store.FSDirectory;
  import org.apache.maven.index.context.ContextMemberProvider;
  import org.apache.maven.index.context.DefaultIndexingContext;
  import org.apache.maven.index.context.ExistingLuceneIndexMismatchException;
  import org.apache.maven.index.context.IndexCreator;
  import org.apache.maven.index.context.IndexUtils;
  import org.apache.maven.index.context.IndexingContext;
  import org.apache.maven.index.context.MergedIndexingContext;
  import org.apache.maven.index.context.StaticContextMemberProvider;
  import org.apache.maven.index.context.UnsupportedExistingLuceneIndexException;
  import org.apache.maven.index.expr.SearchExpression;
  import org.apache.maven.index.util.IndexCreatorSorter;
  import org.codehaus.plexus.util.FileUtils;
  
  /**
   * A default {@link NexusIndexer} implementation.
   *
   * @author Tamas Cservenak
   * @author Eugene Kuleshov
   * @deprecated Use {@link Indexer} instead. Discouraged from further use, as it suffers from multiple synchronization
   *             and other problems. As it tries to serve as "context registry" too, but it does not synchronize the
   *             access to it, but also, introduces some extras (like "targeted" vs "non targeted" search), that makes
   *             it's behavior less intuitive.
   */
  @Deprecated
  @Singleton
  @Named
  public class DefaultNexusIndexer
      implements NexusIndexer
  {
  
      private final Indexer indexer;
  
      private final Scanner scanner;
  
      private final IndexerEngine indexerEngine;
  
      private final QueryCreator queryCreator;
  
      private final Map<String, IndexingContext> indexingContexts = new ConcurrentHashMap<>();
  
  
      @Inject
      public DefaultNexusIndexer( Indexer indexer,
                                  Scanner scanner,
                                  IndexerEngine indexerEngine,
                                  QueryCreator queryCreator )
      {
          this.indexer = indexer;
          this.scanner = scanner;
          this.indexerEngine = indexerEngine;
          this.queryCreator = queryCreator;
      }
  
      // ----------------------------------------------------------------------------
      // Contexts
      // ----------------------------------------------------------------------------
  
      public void addIndexingContext( IndexingContext context )
      {
          indexingContexts.put( context.getId(), context );
      }
  
      public IndexingContext addIndexingContext( String id, String repositoryId, File repository, File indexDirectory,
         String repositoryUrl, String indexUpdateUrl,
         List<? extends IndexCreator> indexers )
         throws IOException, UnsupportedExistingLuceneIndexException
     {
         try
         {
             IndexingContext context =
                 indexer.createIndexingContext( id, repositoryId, repository, indexDirectory, repositoryUrl,
                                                indexUpdateUrl, true, false, indexers );
             indexingContexts.put( context.getId(), context );
             return context;
         }
         catch ( ExistingLuceneIndexMismatchException e )
         {
             throw new UnsupportedExistingLuceneIndexException( e.getMessage(), e );
         }
     }
 
     public IndexingContext addIndexingContextForced( String id, String repositoryId, File repository,
         File indexDirectory, String repositoryUrl, String indexUpdateUrl,
         List<? extends IndexCreator> indexers )
         throws IOException
     {
         IndexingContext context =
             indexer.createIndexingContext( id, repositoryId, repository, indexDirectory, repositoryUrl, indexUpdateUrl,
                                            true, true, indexers );
         indexingContexts.put( context.getId(), context );
         return context;
     }
 
     public IndexingContext addIndexingContext( String id, String repositoryId, File repository, Directory directory,
         String repositoryUrl, String indexUpdateUrl,
         List<? extends IndexCreator> indexers )
         throws IOException, UnsupportedExistingLuceneIndexException
     {
         try
         {
             IndexingContext context =
                 new DefaultIndexingContext( id, repositoryId, repository, directory, repositoryUrl, indexUpdateUrl,
                                             IndexCreatorSorter.sort( indexers ), false );
             indexingContexts.put( context.getId(), context );
             return context;
         }
         catch ( ExistingLuceneIndexMismatchException e )
         {
             throw new UnsupportedExistingLuceneIndexException( e.getMessage(), e );
         }
     }
 
     public IndexingContext addIndexingContextForced( String id, String repositoryId, File repository,
         Directory directory, String repositoryUrl, String indexUpdateUrl,
         List<? extends IndexCreator> indexers )
         throws IOException
     {
         IndexingContext context =
             new DefaultIndexingContext( id, repositoryId, repository, directory, repositoryUrl, indexUpdateUrl,
                                         IndexCreatorSorter.sort( indexers ), true );
         indexingContexts.put( context.getId(), context );
         return context;
     }
 
     public IndexingContext addMergedIndexingContext( String id, String repositoryId, File repository,
         File indexDirectory, boolean searchable,
         Collection<IndexingContext> contexts )
         throws IOException
     {
         return addMergedIndexingContext( id, repositoryId, repository, indexDirectory, searchable,
                                          new StaticContextMemberProvider( contexts ) );
     }
 
     public IndexingContext addMergedIndexingContext( String id, String repositoryId, File repository,
         File indexDirectory, boolean searchable,
         ContextMemberProvider membersProvider )
         throws IOException
     {
         IndexingContext context =
             indexer.createMergedIndexingContext( id, repositoryId, repository, indexDirectory, searchable,
                                                  membersProvider );
         indexingContexts.put( context.getId(), context );
         return context;
     }
 
     public IndexingContext addMergedIndexingContext( String id, String repositoryId, File repository,
         Directory indexDirectory, boolean searchable,
         Collection<IndexingContext> contexts )
         throws IOException
     {
         IndexingContext context =
             new MergedIndexingContext( id, repositoryId, repository, indexDirectory, searchable,
                                        new StaticContextMemberProvider( contexts ) );
         indexingContexts.put( context.getId(), context );
         return context;
     }
 
     public IndexingContext addMergedIndexingContext( String id, String repositoryId, File repository,
         Directory indexDirectory, boolean searchable,
         ContextMemberProvider membersProvider )
         throws IOException
     {
         IndexingContext context =
             new MergedIndexingContext( id, repositoryId, repository, indexDirectory, searchable, membersProvider );
         indexingContexts.put( context.getId(), context );
         return context;
     }
 
     public void removeIndexingContext( IndexingContext context, boolean deleteFiles )
         throws IOException
     {
         if ( indexingContexts.containsKey( context.getId() ) )
         {
             indexingContexts.remove( context.getId() );
             indexer.closeIndexingContext( context, deleteFiles );
         }
     }
 
     public Map<String, IndexingContext> getIndexingContexts()
     {
         return Collections.unmodifiableMap( indexingContexts );
     }
 
     // ----------------------------------------------------------------------------
     // Scanning
     // ----------------------------------------------------------------------------
 
     public void scan( final IndexingContext context )
         throws IOException
     {
         scan( context, null );
     }
 
     public void scan( final IndexingContext context, boolean update )
         throws IOException
     {
         scan( context, null, update );
     }
 
     public void scan( final IndexingContext context, final ArtifactScanningListener listener )
         throws IOException
     {
         scan( context, listener, false );
     }
 
     public void scan( final IndexingContext context, final ArtifactScanningListener listener, final boolean update )
         throws IOException
     {
         scan( context, null, listener, update );
     }
 
     /**
      * Uses {@link Scanner} to scan repository content. A {@link ArtifactScanningListener} is used to process found
      * artifacts and to add them to the index using
      * {@link NexusIndexer#artifactDiscovered(ArtifactContext, IndexingContext)}.
      *
      * @see DefaultScannerListener
      * @see #artifactDiscovered(ArtifactContext, IndexingContext)
      */
     public void scan( final IndexingContext context, final String fromPath, final ArtifactScanningListener listener,
         final boolean update )
         throws IOException
     {
         final File repositoryDirectory = context.getRepository();
         if ( repositoryDirectory == null )
         {
             // nothing to scan
             return;
         }
 
         if ( !repositoryDirectory.exists() )
         {
             throw new IOException( "Repository directory " + repositoryDirectory + " does not exist" );
         }
 
         // always use temporary context when reindexing
         final File tmpDir = Files.createTempDirectory( context.getId() + "-tmp" ).toFile();
         IndexingContext tmpContext = null;
         try
         {
             final FSDirectory directory = FSDirectory.open( tmpDir.toPath() );
             if ( update )
             {
                 IndexUtils.copyDirectory( context.getIndexDirectory(), directory );
             }
             tmpContext = new DefaultIndexingContext( context.getId() + "-tmp", //
                                                      context.getRepositoryId(), //
                                                      context.getRepository(), //
                                                      directory, //
                                                      context.getRepositoryUrl(), //
                                                      context.getIndexUpdateUrl(), //
                                                      context.getIndexCreators(), //
                                                      true );
 
             scanner.scan( new ScanningRequest( tmpContext, //
                                                new DefaultScannerListener( tmpContext, indexerEngine,
                                                                            update, listener ), fromPath ) );
 
             tmpContext.updateTimestamp( true );
             context.replace( tmpContext.getIndexDirectory() );
         }
         catch ( Exception ex )
         {
             throw new IOException( "Error scanning context " + context.getId() + ": " + ex, ex );
         }
         finally
         {
             if ( tmpContext != null )
             {
                 tmpContext.close( true );
             }
 
             FileUtils.deleteDirectory( tmpDir );
         }
     }
 
     /**
      * Delegates to the {@link IndexerEngine} to add a new artifact to the index
      */
     public void artifactDiscovered( ArtifactContext ac, IndexingContext context )
         throws IOException
     {
         if ( ac != null )
         {
             indexerEngine.index( context, ac );
         }
     }
 
     // ----------------------------------------------------------------------------
     // Modifying
     // ----------------------------------------------------------------------------
 
     /**
      * Delegates to the {@link IndexerEngine} to update artifact to the index
      */
     public void addArtifactToIndex( ArtifactContext ac, IndexingContext context )
         throws IOException
     {
         indexer.addArtifactsToIndex( Collections.singleton( ac ), context );
     }
 
     public void addArtifactsToIndex( Collection<ArtifactContext> acs, IndexingContext context )
         throws IOException
     {
         indexer.addArtifactsToIndex( acs, context );
     }
 
     /**
      * Delegates to the {@link IndexerEngine} to remove artifact from the index
      */
     public void deleteArtifactFromIndex( ArtifactContext ac, IndexingContext context )
         throws IOException
     {
         indexer.deleteArtifactsFromIndex( Collections.singleton( ac ), context );
     }
 
     public void deleteArtifactsFromIndex( Collection<ArtifactContext> acs, IndexingContext context )
         throws IOException
     {
         indexer.deleteArtifactsFromIndex( acs, context );
     }
 
     // ----------------------------------------------------------------------------
     // Searching
     // ----------------------------------------------------------------------------
 
     public FlatSearchResponse searchFlat( FlatSearchRequest request )
         throws IOException
     {
         if ( request.getContexts().isEmpty() )
         {
             request.getContexts().addAll( getIndexingContexts().values() );
         }
         return indexer.searchFlat( request );
     }
 
     public IteratorSearchResponse searchIterator( IteratorSearchRequest request )
         throws IOException
     {
         if ( request.getContexts().isEmpty() )
         {
             request.getContexts().addAll( getIndexingContexts().values() );
         }
         return indexer.searchIterator( request );
     }
 
     public GroupedSearchResponse searchGrouped( GroupedSearchRequest request )
         throws IOException
     {
         if ( request.getContexts().isEmpty() )
         {
             request.getContexts().addAll( getIndexingContexts().values() );
         }
         return indexer.searchGrouped( request );
     }
 
     // ----------------------------------------------------------------------------
     // Query construction
     // ----------------------------------------------------------------------------
 
     @Deprecated
     public Query constructQuery( Field field, String query, SearchType type )
         throws IllegalArgumentException
     {
         try
         {
             return queryCreator.constructQuery( field, query, type );
         }
         catch ( ParseException e )
         {
             throw new IllegalArgumentException( e );
         }
     }
 
     public Query constructQuery( Field field, SearchExpression expression )
         throws IllegalArgumentException
     {
         return indexer.constructQuery( field, expression );
     }
 
     // ----------------------------------------------------------------------------
     // Identification
     // ----------------------------------------------------------------------------
 
     public Collection<ArtifactInfo> identify( Field field, String query )
         throws IllegalArgumentException, IOException
     {
         return identify( constructQuery( field, query, SearchType.EXACT ) );
     }
 
     public Collection<ArtifactInfo> identify( File artifact )
         throws IOException
     {
         return identify( artifact, indexingContexts.values() );
     }
 
     public Collection<ArtifactInfo> identify( File artifact, Collection<IndexingContext> contexts )
         throws IOException
     {
         return indexer.identify( artifact, contexts );
     }
 
     public Collection<ArtifactInfo> identify( Query query )
         throws IOException
     {
         return identify( query, indexingContexts.values() );
     }
 
     public Collection<ArtifactInfo> identify( Query query, Collection<IndexingContext> contexts )
         throws IOException
     {
         return indexer.identify( query, contexts );
     }
 }