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@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 Edge(NodeId fromId, NodeId toId)31 protected Edge(NodeId fromId, NodeId toId) { 32 this.fromId = fromId; 33 this.toId = toId; 34 } 35 getFromId()36 public NodeId getFromId() { 37 return fromId; 38 } 39 getToId()40 public NodeId getToId() { 41 return toId; 42 } 43 equals(Object obj)44 @Override public boolean equals(Object obj) { 45 if (!(obj instanceof Edge)) { 46 return false; 47 } 48 Edge other = (Edge) obj; 49 return Objects.equal(fromId, other.fromId) && Objects.equal(toId, other.toId); 50 } 51 hashCode()52 @Override public int hashCode() { 53 return Objects.hashCode(fromId, toId); 54 } 55 56 /** 57 * Returns a copy of the edge with new node IDs. 58 * 59 * @param fromId new ID of the 'from' node 60 * @param toId new ID of the 'to' node 61 * @return copy of the edge with the new node IDs 62 */ copy(NodeId fromId, NodeId toId)63 public abstract Edge copy(NodeId fromId, NodeId toId); 64 } 65