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 * Node in a guice dependency graph. 23 * 24 * @author bojand (at) google.com (Bojan Djordjevic) 25 * @since 4.0 26 */ 27 public abstract class Node { 28 /** 29 * When set to true, the source object is ignored in {@link #equals} and {@link #hashCode}. 30 * Only used in tests. 31 */ 32 static boolean ignoreSourceInComparisons = false; 33 34 private final NodeId id; 35 private final Object source; 36 37 protected Node(NodeId id, Object source) { 38 this.id = id; 39 this.source = source; 40 } 41 42 public NodeId getId() { 43 return id; 44 } 45 46 public Object getSource() { 47 return source; 48 } 49 50 @Override public boolean equals(Object obj) { 51 if (!(obj instanceof Node)) { 52 return false; 53 } 54 Node other = (Node) obj; 55 return Objects.equal(id, other.id) 56 && (ignoreSourceInComparisons || Objects.equal(source, other.source)); 57 } 58 59 @Override public int hashCode() { 60 return ignoreSourceInComparisons ? id.hashCode() : Objects.hashCode(id, source); 61 } 62 63 /** 64 * Returns a copy of the node with a new ID. 65 * 66 * @param id new ID of the node 67 * @return copy of the node with a new ID 68 */ 69 public abstract Node copy(NodeId id); 70 } 71
