content: package org.apache.solr.search.grouping.endresulttransformer;
  
  /*
   * 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.lucene.search.ScoreDoc;
  import org.apache.lucene.search.grouping.GroupDocs;
  import org.apache.lucene.search.grouping.TopGroups;
  import org.apache.lucene.util.BytesRef;
  import org.apache.solr.common.SolrDocumentList;
  import org.apache.solr.common.util.NamedList;
  import org.apache.solr.common.util.SimpleOrderedMap;
  import org.apache.solr.response.SolrQueryResponse;
  import org.apache.solr.search.grouping.GroupingSpecification;
  
  import java.util.Map;
  
  /**
   *
   */
  public class SimpleEndResultTransformer implements EndResultTransformer {
  
    public void transform(Map<String, ?> result, SolrQueryResponse response, GroupingSpecification groupingSpecification, SolrDocumentSource solrDocumentSource) {
      NamedList<Object> commands = new SimpleOrderedMap<Object>();
      for (Map.Entry<String, ?> entry : result.entrySet()) {
        Object value = entry.getValue();
        if (TopGroups.class.isInstance(value)) {
          @SuppressWarnings("unchecked")
          TopGroups<BytesRef> topGroups = (TopGroups<BytesRef>) value;
          NamedList<Object> command = new SimpleOrderedMap<Object>();
          command.add("matches", topGroups.totalHitCount);
          if (topGroups.totalGroupCount != null) {
            command.add("ngroups", topGroups.totalGroupCount);
          }
          SolrDocumentList docList = new SolrDocumentList();
          docList.setStart(groupingSpecification.getOffset());
          docList.setNumFound(topGroups.totalHitCount);
  
          Float maxScore = Float.NEGATIVE_INFINITY;
          for (GroupDocs<BytesRef> group : topGroups.groups) {
            for (ScoreDoc scoreDoc : group.scoreDocs) {
              if (maxScore < scoreDoc.score) {
                maxScore = scoreDoc.score;
              }
              docList.add(solrDocumentSource.retrieve(scoreDoc));
            }
          }
          if (maxScore != Float.NEGATIVE_INFINITY) {
            docList.setMaxScore(maxScore);
          }
          command.add("doclist", docList);
          commands.add(entry.getKey(), command);
        }
      }
  
      response.add("grouped", commands);
    }
  }
  