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;
  
  /**
   * Represents a Vertex.
   *
   * @param <V> vertex class used by the graph
   * @param <E> edge class used by the graph
   */
  public interface AtlasVertex<V, E> extends AtlasElement {
      /**
       * Gets the edges incident to this vertex going the
       * specified direction that have the specified edgeLabel.  If
       * the edgeLabel is null, it is ignored.
       *
       * @param out
       * @param edgeLabel
       * @return
       */
      Iterable<AtlasEdge<V, E>> getEdges(AtlasEdgeDirection out, String edgeLabel);
  
      /**
       * Gets the edges associated with this vertex going the
       * specified direction that have the specified edgeLabels.
       *
       * @param direction
       * @param edgeLabels
       * @return
       */
      Iterable<AtlasEdge<V, E>> getEdges(AtlasEdgeDirection direction, String[] edgeLabels);
  
      long getEdgesCount(AtlasEdgeDirection direction, String edgeLabel);
  
      /**
       * Does vertex have edges specified by the direction and label
       * @param dir
       * @param edgeLabel
       * @return
       */
      boolean hasEdges(AtlasEdgeDirection dir, String edgeLabel);
  
      /**
       * Gets the edges associated with this vertex going the
       * specified direction.
       *
       * @param in
       * @return
       */
      Iterable<AtlasEdge<V, E>> getEdges(AtlasEdgeDirection in);
  
      /**
       * Adds a value to a multiplicity many property.  Follows Java set
       * semantics.  If the property is already present, it is not added again,
       * and no exception is thrown.
       *
       *
       * @param propertyName
       * @param value
       */
      <T> void addProperty(String propertyName, T value);
  
      /**
       * Adds a value to a multiplicity-many property.
       * If the property is already present, the value is added to it; if not, the propery is set with the given value
       *
       * @param propertyName
       * @param value
       */
      <T> void addListProperty(String propertyName, T value);
  
      /**
       * Creates a vertex query.
       * @return
       */
      AtlasVertexQuery<V, E> query();
  
      /**
       * Syntactic sugar to get the vertex as an instance of its
       * implementation type.  This allows the graph database implementation
       * code to be strongly typed.
       *
       * @return
       */
      V getV();
  }
  