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.graphdb.janus.migration;
  
  import org.apache.atlas.model.typedef.AtlasRelationshipDef;
  import org.apache.atlas.model.typedef.AtlasRelationshipDef.PropagateTags;
  import org.apache.atlas.model.typedef.AtlasRelationshipEndDef;
  import org.apache.atlas.repository.Constants;
  import org.apache.atlas.type.AtlasRelationshipType;
  import org.apache.atlas.type.AtlasTypeRegistry;
  import org.apache.atlas.v1.typesystem.types.utils.TypesUtil;
  import org.apache.commons.lang.StringUtils;
  
  import java.util.HashMap;
  import java.util.Map;
  
  public class RelationshipCacheGenerator {
      private RelationshipCacheGenerator() {
          // to block instantiation
      }
  
      public static Map<String, TypeInfo> get(AtlasTypeRegistry typeRegistry) {
          Map<String, TypeInfo> ret = new HashMap<>();
  
          for (AtlasRelationshipType relType : typeRegistry.getAllRelationshipTypes()) {
              AtlasRelationshipDef relDef      = relType.getRelationshipDef();
              String               relTypeName = relType.getTypeName();
  
              add(ret, getKey(relDef.getEndDef1()), relTypeName, relDef.getPropagateTags());
              add(ret, getKey(relDef.getEndDef2()), relTypeName, getEnd2PropagateTag(relDef.getPropagateTags()));
          }
  
          return ret;
      }
  
      private static String getKey(AtlasRelationshipEndDef endDef) {
          return getKey(endDef.getIsLegacyAttribute(), endDef.getType(), endDef.getName());
      }
  
      private static String getKey(String lhs, String rhs) {
          return String.format("%s%s.%s", Constants.INTERNAL_PROPERTY_KEY_PREFIX, lhs, rhs);
      }
  
      private static String getKey(boolean isLegacy, String entityTypeName, String relEndName) {
          if (!isLegacy) {
              return "";
          }
  
          return getKey(entityTypeName, relEndName);
      }
  
      private static void add(Map<String, TypeInfo> map, String key, String relationTypeName, PropagateTags propagateTags) {
          if (StringUtils.isEmpty(key) || map.containsKey(key)) {
              return;
          }
  
          map.put(key, new TypeInfo(relationTypeName, propagateTags));
      }
  
      private static PropagateTags getEnd2PropagateTag(PropagateTags end1PropagateTags) {
          if (end1PropagateTags == PropagateTags.ONE_TO_TWO) {
              return PropagateTags.TWO_TO_ONE;
          } else if (end1PropagateTags == PropagateTags.TWO_TO_ONE) {
              return PropagateTags.ONE_TO_TWO;
          } else {
              return end1PropagateTags;
          }
      }
  
      public static class TypeInfo extends TypesUtil.Pair<String, PropagateTags> {
          public TypeInfo(String typeName, PropagateTags propagateTags) {
              super(typeName, propagateTags);
          }
  
          public String getTypeName() {
              return left;
          }
  
          public PropagateTags getPropagateTags() {
              return right;
          }
      }
  }
  