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;
  
  /**
   * Represent an edge in the graph.
   *
   * @param <V> vertex class used by the graph
   * @param <E> edge class used by the graph
   */
  public interface AtlasEdge<V, E> extends AtlasElement {
      /**
       * Gets the incoming vertex for this edge.
       * @return
       */
      AtlasVertex<V, E> getInVertex();
  
      /**
       * Gets the outgoing vertex for this edge.
       *
       * @return
       */
      AtlasVertex<V, E> getOutVertex();
  
      /**
       * Gets the label associated with this edge.
       *
       * @return
       */
      String getLabel();
  
      /**
       * Converts the edge to an instance of the underlying implementation class.  This
       * is syntactic sugar that allows the graph database implementation code to be strongly typed.  This
       * should not be called in other places.
       *
       * @return
       */
      E getE();
  }
  