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.web.util;
  
  import org.apache.atlas.AtlasClient;
  import org.apache.atlas.exception.AtlasBaseException;
  import org.apache.atlas.model.instance.AtlasEntity;
  import org.apache.atlas.model.instance.AtlasEntityHeader;
  import org.apache.atlas.model.lineage.AtlasLineageInfo;
  import org.apache.atlas.model.typedef.AtlasBaseTypeDef;
  import org.apache.atlas.repository.Constants;
  import org.apache.atlas.type.AtlasEntityType;
  import org.apache.atlas.type.AtlasType;
  import org.apache.atlas.type.AtlasTypeRegistry;
  import org.apache.atlas.v1.model.instance.Struct;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.atomic.AtomicInteger;
  
  public final class LineageUtils {
      private static final String        VERTEX_ID_ATTR_NAME   = "vertexId";
      private static final String        TEMP_STRUCT_ID_RESULT = "__IdType";
      private static final AtomicInteger COUNTER               = new AtomicInteger();
  
      private LineageUtils() {}
  
      public static Struct toLineageStruct(AtlasLineageInfo lineageInfo, AtlasTypeRegistry registry) throws AtlasBaseException {
          Struct ret = new Struct();
  
          ret.setTypeName(Constants.TEMP_STRUCT_NAME_PREFIX + COUNTER.getAndIncrement());
  
          if (lineageInfo != null) {
              Map<String, AtlasEntityHeader>        entities    = lineageInfo.getGuidEntityMap();
              Set<AtlasLineageInfo.LineageRelation> relations   = lineageInfo.getRelations();
              AtlasLineageInfo.LineageDirection     direction   = lineageInfo.getLineageDirection();
              Map<String, Struct>                   verticesMap = new HashMap<>();
  
              // Lineage Entities mapping -> verticesMap (vertices)
              for (String guid : entities.keySet()) {
                  AtlasEntityHeader entityHeader = entities.get(guid);
  
                  if (isDataSet(entityHeader.getTypeName(), registry)) {
                      Map<String, Object> vertexIdMap = new HashMap<>();
  
                      vertexIdMap.put(Constants.ATTRIBUTE_NAME_GUID, guid);
                      vertexIdMap.put(Constants.ATTRIBUTE_NAME_STATE, (entityHeader.getStatus() == AtlasEntity.Status.ACTIVE) ? "ACTIVE" : "DELETED");
                      vertexIdMap.put(Constants.ATTRIBUTE_NAME_TYPENAME, entityHeader.getTypeName());
  
                      Object qualifiedName = entityHeader.getAttribute(AtlasClient.REFERENCEABLE_ATTRIBUTE_NAME);
  
                      if (qualifiedName == null) {
                          qualifiedName = entityHeader.getDisplayText();
                      }
  
                      Map<String, Object> values = new HashMap<>();
  
                      values.put(AtlasClient.REFERENCEABLE_ATTRIBUTE_NAME, qualifiedName);
                      values.put(VERTEX_ID_ATTR_NAME, constructResultStruct(vertexIdMap, true));
                      values.put(AtlasClient.NAME, entityHeader.getDisplayText());
  
                      verticesMap.put(guid, constructResultStruct(values, false));
                  }
              }
  
              // Lineage Relations mapping -> edgesMap (edges)
              Map<String, List<String>> edgesMap = new HashMap<>();
  
              for (AtlasLineageInfo.LineageRelation relation : relations) {
                  String fromEntityId = relation.getFromEntityId();
                  String toEntityId   = relation.getToEntityId();
  
                  if (direction == AtlasLineageInfo.LineageDirection.INPUT) {
                      if (!edgesMap.containsKey(toEntityId)) {
                          edgesMap.put(toEntityId, new ArrayList<>());
                      }
  
                      edgesMap.get(toEntityId).add(fromEntityId);
                  } else if (direction == AtlasLineageInfo.LineageDirection.OUTPUT) {
                      if (!edgesMap.containsKey(fromEntityId)) {
                          edgesMap.put(fromEntityId, new ArrayList<>());
                      }
  
                      edgesMap.get(fromEntityId).add(toEntityId);
                  }
              }
  
              ret.set("vertices", verticesMap);
              ret.set("edges", edgesMap);
          }
  
          return ret;
      }
  
      private static Struct constructResultStruct(Map<String, Object> values, boolean idType) {
          if (idType) {
              return new Struct(TEMP_STRUCT_ID_RESULT, values);
          }
  
          return new Struct(Constants.TEMP_STRUCT_NAME_PREFIX + COUNTER.getAndIncrement(), values);
      }
  
      private static boolean isDataSet(String typeName, AtlasTypeRegistry registry) throws AtlasBaseException {
          boolean   ret  = false;
          AtlasType type = registry.getType(typeName);
  
          if (type instanceof AtlasEntityType) {
              AtlasEntityType entityType = (AtlasEntityType) type;
  
              ret = entityType.getAllSuperTypes().contains(AtlasBaseTypeDef.ATLAS_TYPE_DATASET);
          }
  
          return ret;
      }
  }
  