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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.repository.impexp;
  
  import org.apache.atlas.model.instance.AtlasEntity;
  import org.apache.atlas.model.typedef.AtlasEntityDef;
  import org.apache.atlas.repository.graphdb.AtlasGraph;
  import org.apache.atlas.type.AtlasTypeRegistry;
  
  import java.util.HashMap;
  import java.util.Map;
  
  public class EntitiesExtractor {
      static final         String PROPERTY_GUID          = "__guid";
      private static final String VERTEX_BASED_EXTRACT   = "default";
      private static final String INCREMENTAL_EXTRACT    = "incremental";
      private static final String RELATION_BASED_EXTRACT = "relationship";
  
      private final Map<String, ExtractStrategy> extractors = new HashMap<>();
      private       ExtractStrategy              extractor;
  
      public EntitiesExtractor(AtlasGraph atlasGraph, AtlasTypeRegistry typeRegistry) {
          extractors.put(VERTEX_BASED_EXTRACT, new VertexExtractor(atlasGraph, typeRegistry));
          extractors.put(INCREMENTAL_EXTRACT, new IncrementalExportEntityProvider(atlasGraph));
          extractors.put(RELATION_BASED_EXTRACT, new RelationshipAttributesExtractor(typeRegistry));
      }
  
      public void get(AtlasEntity entity, ExportService.ExportContext context) {
          if (extractor == null) {
              extractor = extractors.get(VERTEX_BASED_EXTRACT);
          }
  
          switch (context.fetchType) {
              case CONNECTED:
                  extractor.connectedFetch(entity, context);
                  break;
  
              case INCREMENTAL:
                  if (context.isHiveDBIncrementalSkipLineage()) {
                      extractors.get(INCREMENTAL_EXTRACT).fullFetch(entity, context);
                      break;
                  } else if (context.isHiveTableIncremental()) {
                      if (context.skipLineage) {
                          extractors.get(INCREMENTAL_EXTRACT).connectedFetch(entity, context);
                      } else {
                          extractor.connectedFetch(entity, context);
                      }
                      break;
                  }
  
              case FULL:
              default:
                  extractor.fullFetch(entity, context);
          }
      }
  
      public void setExtractor(AtlasEntityDef atlasEntityDef) {
          extractor = extractUsing(atlasEntityDef);
      }
  
      public void close() {
          for (ExtractStrategy es : extractors.values()) {
              es.close();
          }
      }
  
      private ExtractStrategy extractUsing(AtlasEntityDef atlasEntityDef) {
          return (atlasEntityDef == null || atlasEntityDef.getRelationshipAttributeDefs().isEmpty()) ? extractors.get(VERTEX_BASED_EXTRACT) : extractors.get(RELATION_BASED_EXTRACT);
      }
  }
  