| /* |
| * 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.NullWritable; |
| import org.apache.hadoop.io.WritableComparable; |
| |
| /** |
| * An edge that has no value. |
| * |
| * @param <I> Vertex ID |
| */ |
| public class EdgeNoValue<I extends WritableComparable> |
| implements ReusableEdge<I, NullWritable> { |
| /** Target vertex id */ |
| private I targetVertexId = null; |
| |
| /** Empty constructor */ |
| EdgeNoValue() { } |
| |
| /** |
| * Constructor with target vertex ID. Don't call, use EdgeFactory instead. |
| * |
| * @param targetVertexId vertex ID |
| */ |
| EdgeNoValue(I targetVertexId) { |
| this.targetVertexId = targetVertexId; |
| } |
| |
| @Override |
| public void setTargetVertexId(I targetVertexId) { |
| this.targetVertexId = targetVertexId; |
| } |
| |
| @Override |
| public void setValue(NullWritable value) { |
| // do nothing |
| } |
| |
| @Override |
| public I getTargetVertexId() { |
| return targetVertexId; |
| } |
| |
| @Override |
| public NullWritable getValue() { |
| return NullWritable.get(); |
| } |
| |
| @Override |
| public String toString() { |
| return "(targetVertexId = " + targetVertexId + ")"; |
| } |
| } |