1 /* 2 * Copyright (C) 2011 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.inject.grapher; 18 19 import com.google.common.base.Objects; 20 21 /** 22 * Edge in a guice dependency graph. 23 * 24 * @author bojand (at) google.com (Bojan Djordjevic) 25 * @since 4.0 26 */ 27 public abstract class Edge { 28 private final NodeId fromId; 29 private final NodeId toId; 30 31 protected Edge(NodeId fromId, NodeId toId) { 32 this.fromId = fromId; 33 this.toId = toId; 34 } 35 36 public NodeId getFromId() { 37 return fromId; 38 } 39 40 public NodeId getToId() { 41 return toId; 42 } 43 44 @Override 45 public boolean equals(Object obj) { 46 if (!(obj instanceof Edge)) { 47 return false; 48 } 49 Edge other = (Edge) obj; 50 return Objects.equal(fromId, other.fromId) && Objects.equal(toId, other.toId); 51 } 52 53 @Override 54 public int hashCode() { 55 return Objects.hashCode(fromId, toId); 56 } 57 58 /** 59 * Returns a copy of the edge with new node IDs. 60 * 61 * @param fromId new ID of the 'from' node 62 * @param toId new ID of the 'to' node 63 * @return copy of the edge with the new node IDs 64 */ 65 public abstract Edge copy(NodeId fromId, NodeId toId); 66 } 67
