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.io; 20 21 import java.io.IOException; 22 import org.apache.hadoop.io.Writable; 23 import org.apache.hadoop.io.WritableComparable; 24 25 /** 26 * Abstract base class for VertexValueReader. 27 * 28 * @param <I> Vertex id 29 * @param <V> Vertex data 30 */ 31 public abstract class BasicVertexValueReader<I extends WritableComparable, 32 V extends Writable> 33 extends VertexReader<I, V, Writable> { 34 /** 35 * User-defined method to extract the vertex id. 36 * 37 * @return The vertex id 38 * @throws java.io.IOException 39 * @throws InterruptedException 40 */ 41 public abstract I getCurrentVertexId() throws IOException, 42 InterruptedException; 43 44 /** 45 * User-defined method to extract the vertex value. 46 * 47 * @return The vertex value 48 * @throws IOException 49 * @throws InterruptedException 50 */ 51 public abstract V getCurrentVertexValue() throws IOException, 52 InterruptedException; 53 }