/*

  * 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

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * 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.giraph.edge;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 /**

  * Interface for {@link OutEdges} implementations that provide efficient

  * random access to the edges given the target vertex id.

  * This version is for strict graphs (i.e. assumes no parallel edges).

  *

  * @param <I> Vertex id

  * @param <E> Edge value

  */

 public interface StrictRandomAccessOutEdges<I extends WritableComparable,

     E extends Writable> extends OutEdges<I, E> {

   /**

    * Return the edge value for the given target vertex id (or null if there

    * is no edge pointing to it).

    *

    * @param targetVertexId Target vertex id

    * @return Edge value

    */

   E getEdgeValue(I targetVertexId);

   /**

    * Set the edge value for the given target vertex id (if an edge to that

    * vertex exists).

    *

    * @param targetVertexId Target vertex id

    * @param edgeValue Edge value

    */

   void setEdgeValue(I targetVertexId, E edgeValue);

 }