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.response.SolrQueryResponse;
  import org.apache.solr.search.grouping.GroupingSpecification;
  
  import java.util.Map;
  
  /**
   *
   */
  public class MainEndResultTransformer implements EndResultTransformer {
  
    public void transform(Map<String, ?> result, SolrQueryResponse response, GroupingSpecification groupingSpecification, SolrDocumentSource solrDocumentSource) {
      Object value = result.get(groupingSpecification.getFields()[0]);
      if (TopGroups.class.isInstance(value)) {
        @SuppressWarnings("unchecked")
        TopGroups<BytesRef> topGroups = (TopGroups<BytesRef>) value;
        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);
        }
        response.add("response", docList);
      }
    }
  }
  