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 * Interface for {@link OutEdges} implementations that provide efficient 26 * random access to the edges given the target vertex id. 27 * This version is for strict graphs (i.e. assumes no parallel edges). 28 * 29 * @param <I> Vertex id 30 * @param <E> Edge value 31 */ 32 public interface StrictRandomAccessOutEdges<I extends WritableComparable, 33 E extends Writable> extends OutEdges<I, E> { 34 /** 35 * Return the edge value for the given target vertex id (or null if there 36 * is no edge pointing to it). 37 * 38 * @param targetVertexId Target vertex id 39 * @return Edge value 40 */ 41 E getEdgeValue(I targetVertexId); 42 43 /** 44 * Set the edge value for the given target vertex id (if an edge to that 45 * vertex exists). 46 * 47 * @param targetVertexId Target vertex id 48 * @param edgeValue Edge value 49 */ 50 void setEdgeValue(I targetVertexId, E edgeValue); 51 }