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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.giraph.edge;
20  
21  import org.apache.hadoop.io.Writable;
22  import org.apache.hadoop.io.WritableComparable;
23  
24  /**
25   * A complete edge, the target vertex and the edge value.  Can only be one
26   * edge with a destination vertex id per edge map.
27   *
28   * @param <I> Vertex index
29   * @param <E> Edge value
30   */
31  public interface Edge<I extends WritableComparable, E extends Writable> {
32    /**
33     * Get the target vertex index of this edge
34     *
35     * @return Target vertex index of this edge
36     */
37    I getTargetVertexId();
38  
39    /**
40     * Get the edge value of the edge
41     *
42     * @return Edge value of this edge
43     */
44    E getValue();
45  }