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;
  
  import org.apache.atlas.repository.graphdb.AtlasCardinality;
  import org.apache.atlas.repository.graphdb.AtlasEdgeDirection;
  import org.apache.atlas.repository.graphdb.AtlasPropertyKey;
  import org.apache.tinkerpop.gremlin.structure.Direction;
  import org.janusgraph.core.Cardinality;
  import org.janusgraph.core.PropertyKey;
  
  import java.util.List;
  
  /**
   * Factory that serves up instances of Janus/Tinkerpop classes that correspond to
   * graph database abstraction layer/Atlas classes.
   */
  public final class AtlasJanusObjectFactory {
      private AtlasJanusObjectFactory() {
      }
  
      /**
       * Retrieves the Janus direction corresponding to the given
       * AtlasEdgeDirection.
       *
       * @param dir
       * @return
       */
      public static Direction createDirection(AtlasEdgeDirection dir) {
          switch (dir) {
              case IN:
                  return Direction.IN;
              case OUT:
                  return Direction.OUT;
              case BOTH:
                  return Direction.BOTH;
              default:
                  throw new RuntimeException("Unrecognized direction: " + dir);
          }
      }
  
      /**
       * Converts a Multiplicity to a Cardinality.
       *
       * @param cardinality
       * @return
       */
      public static Cardinality createCardinality(AtlasCardinality cardinality) {
          switch (cardinality) {
              case SINGLE:
                  return Cardinality.SINGLE;
              case LIST:
                  return Cardinality.LIST;
              case SET:
                  return Cardinality.SET;
              default:
                  throw new IllegalStateException("Unrecognized cardinality: " + cardinality);
          }
      }
  
      public static PropertyKey createPropertyKey(AtlasPropertyKey key) {
          return ((AtlasJanusPropertyKey) key).getWrappedPropertyKey();
      }
  
      public static PropertyKey[] createPropertyKeys(List<AtlasPropertyKey> keys) {
          PropertyKey[] ret = new PropertyKey[keys.size()];
          int           i   = 0;
  
          for (AtlasPropertyKey key : keys) {
              ret[i] = createPropertyKey(key);
  
              i++;
          }
  
          return ret;
      }
  }
  