content: package org.apache.solr.search.grouping.distributed.shardresultserializer;
  
  /*
   * 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.Sort;
  import org.apache.lucene.search.grouping.SearchGroup;
  import org.apache.lucene.util.BytesRef;
  import org.apache.solr.common.util.NamedList;
  import org.apache.solr.schema.FieldType;
  import org.apache.solr.schema.SchemaField;
  import org.apache.solr.search.SolrIndexSearcher;
  import org.apache.solr.search.grouping.Command;
  import org.apache.solr.search.grouping.distributed.command.SearchGroupsFieldCommand;
  
  import java.io.IOException;
  import java.util.*;
  
  /**
   * Implementation for transforming {@link SearchGroup} into a {@link NamedList} structure and visa versa.
   */
  public class SearchGroupsResultTransformer implements ShardResultTransformer<List<Command>, Map<String, Collection<SearchGroup<String>>>> {
  
    private final SolrIndexSearcher searcher;
  
    public SearchGroupsResultTransformer(SolrIndexSearcher searcher) {
      this.searcher = searcher;
    }
  
    /**
     * {@inheritDoc}
     */
    public NamedList transform(List<Command> data) throws IOException {
      NamedList<NamedList> result = new NamedList<NamedList>();
      for (Command command : data) {
        NamedList commandResult;
        if (SearchGroupsFieldCommand.class.isInstance(command)) {
          SearchGroupsFieldCommand fieldCommand = (SearchGroupsFieldCommand) command;
          Collection<SearchGroup<String>> searchGroups = fieldCommand.result();
          if (searchGroups == null) {
            continue;
          }
  
          commandResult = serializeSearchGroup(searchGroups, fieldCommand.getGroupSort());
        } else {
          commandResult = null;
        }
  
        result.add(command.getKey(), commandResult);
      }
      return result;
    }
  
    /**
     * {@inheritDoc}
     */
    public Map<String, Collection<SearchGroup<String>>> transformToNative(NamedList<NamedList> shardResponse, Sort groupSort, Sort sortWithinGroup, String shard) throws IOException {
      Map<String, Collection<SearchGroup<String>>> result = new HashMap<String, Collection<SearchGroup<String>>>();
      for (Map.Entry<String, NamedList> command : shardResponse) {
        List<SearchGroup<String>> searchGroups = new ArrayList<SearchGroup<String>>();
        @SuppressWarnings("unchecked")
        NamedList<List<Comparable>> rawSearchGroups = command.getValue();
        for (Map.Entry<String, List<Comparable>> rawSearchGroup : rawSearchGroups){
          SearchGroup<String> searchGroup = new SearchGroup<String>();
          searchGroup.groupValue = rawSearchGroup.getKey() != null ? rawSearchGroup.getKey() : null;
          searchGroup.sortValues = rawSearchGroup.getValue().toArray(new Comparable[rawSearchGroup.getValue().size()]);
          searchGroups.add(searchGroup);
        }
  
        result.put(command.getKey(), searchGroups);
      }
      return result;
    }
  
    private NamedList serializeSearchGroup(Collection<SearchGroup<String>> data, Sort groupSort) {
      NamedList<Comparable[]> result = new NamedList<Comparable[]>();
  
      for (SearchGroup<String> searchGroup : data) {
        Comparable[] convertedSortValues = new Comparable[searchGroup.sortValues.length];
        for (int i = 0; i < searchGroup.sortValues.length; i++) {
          Comparable sortValue = (Comparable) searchGroup.sortValues[i];
          SchemaField field = groupSort.getSort()[i].getField() != null ? searcher.getSchema().getFieldOrNull(groupSort.getSort()[i].getField()) : null;
          if (field != null) {
            FieldType fieldType = field.getType();
            if (sortValue instanceof String) {
              sortValue = (Comparable) fieldType.toObject(field.createField(fieldType.indexedToReadable((String) sortValue), 0.0f));
            }
          }
          convertedSortValues[i] = sortValue;
        }
        String groupValue = searchGroup.groupValue != null ? searchGroup.groupValue : null;
        result.add(groupValue, convertedSortValues);
      }
  
      return result;
    }
  
  }
  