content: /**
   * 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.
   */
  
  package org.apache.solr.handler.component;
  
  import java.io.IOException;
  import java.net.URL;
  
  import org.apache.solr.common.params.MoreLikeThisParams;
  import org.apache.solr.common.params.SolrParams;
  import org.apache.solr.common.util.NamedList;
  import org.apache.solr.common.util.SimpleOrderedMap;
  import org.apache.solr.handler.MoreLikeThisHandler;
  import org.apache.solr.schema.IndexSchema;
  import org.apache.solr.search.DocIterator;
  import org.apache.solr.search.DocList;
  import org.apache.solr.search.DocListAndSet;
  import org.apache.solr.search.SolrIndexSearcher;
  
  /**
   * TODO!
   * 
   * @version $Id: MoreLikeThisComponent.java 1064775 2011-01-28 16:58:46Z koji $
   * @since solr 1.3
   */
  public class MoreLikeThisComponent extends SearchComponent
  {
    public static final String COMPONENT_NAME = "mlt";
    
    @Override
    public void prepare(ResponseBuilder rb) throws IOException
    {
      
    }
  
    @Override
    public void process(ResponseBuilder rb) throws IOException
    {
      SolrParams p = rb.req.getParams();
      if( p.getBool( MoreLikeThisParams.MLT, false ) ) {
        SolrIndexSearcher searcher = rb.req.getSearcher();
        
        NamedList<DocList> sim = getMoreLikeThese( rb, searcher,
            rb.getResults().docList, rb.getFieldFlags() );
  
        // TODO ???? add this directly to the response?
        rb.rsp.add( "moreLikeThis", sim );
      }
    }
  
    NamedList<DocList> getMoreLikeThese( ResponseBuilder rb, SolrIndexSearcher searcher,
        DocList docs, int flags ) throws IOException {
      SolrParams p = rb.req.getParams();
      IndexSchema schema = searcher.getSchema();
      MoreLikeThisHandler.MoreLikeThisHelper mltHelper 
        = new MoreLikeThisHandler.MoreLikeThisHelper( p, searcher );
      NamedList<DocList> mlt = new SimpleOrderedMap<DocList>();
      DocIterator iterator = docs.iterator();
  
      SimpleOrderedMap<Object> dbg = null;
      if( rb.isDebug() ){
        dbg = new SimpleOrderedMap<Object>();
      }
  
      while( iterator.hasNext() ) {
        int id = iterator.nextDoc();
        int rows = p.getInt( MoreLikeThisParams.DOC_COUNT, 5 );
        DocListAndSet sim = mltHelper.getMoreLikeThis( id, 0, rows, null, null, flags );
        String name = schema.printableUniqueKey( searcher.doc( id ) );
        mlt.add(name, sim.docList);
        
        if( dbg != null ){
          SimpleOrderedMap<Object> docDbg = new SimpleOrderedMap<Object>();
          docDbg.add( "rawMLTQuery", mltHelper.getRawMLTQuery().toString() );
          docDbg.add( "boostedMLTQuery", mltHelper.getBoostedMLTQuery().toString() );
          docDbg.add( "realMLTQuery", mltHelper.getRealMLTQuery().toString() );
          SimpleOrderedMap<Object> explains = new SimpleOrderedMap<Object>();
          DocIterator mltIte = sim.docList.iterator();
          while( mltIte.hasNext() ){
            int mltid = mltIte.nextDoc();
            String key = schema.printableUniqueKey( searcher.doc( mltid ) );
            explains.add( key, searcher.explain( mltHelper.getRealMLTQuery(), mltid ) );
          }
          docDbg.add( "explain", explains );
          dbg.add( name, docDbg );
        }
      }
  
      // add debug information
      if( dbg != null ){
        rb.addDebugInfo( "moreLikeThis", dbg );
      }
      return mlt;
    }
    
    /////////////////////////////////////////////
    ///  SolrInfoMBean
    ////////////////////////////////////////////
  
    @Override
    public String getDescription() {
      return "More Like This";
    }
  
    @Override
    public String getVersion() {
      return "$Revision: 1064775 $";
    }
  
    @Override
    public String getSourceId() {
      return "$Id: MoreLikeThisComponent.java 1064775 2011-01-28 16:58:46Z koji $";
    }
  
    @Override
    public String getSource() {
      return "$URL: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_3_5/solr/core/src/java/org/apache/solr/handler/component/MoreLikeThisComponent.java $";
    }
  
    @Override
    public URL[] getDocs() {
      return null;
    }
  }
  