01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17:
18: package java.util;
19:
20: /**
21: * MapEntry is an internal class which provides an implementation of Map.Entry.
22: */
23: class MapEntry<K, V> implements Map.Entry<K, V>, Cloneable {
24:
25: K key;
26: V value;
27:
28: interface Type<RT, KT, VT> {
29: RT get(MapEntry<KT, VT> entry);
30: }
31:
32: MapEntry(K theKey) {
33: key = theKey;
34: }
35:
36: MapEntry(K theKey, V theValue) {
37: key = theKey;
38: value = theValue;
39: }
40:
41: @Override
42: public Object clone() {
43: try {
44: return super .clone();
45: } catch (CloneNotSupportedException e) {
46: return null;
47: }
48: }
49:
50: @Override
51: public boolean equals(Object object) {
52: if (this == object) {
53: return true;
54: }
55: if (object instanceof Map.Entry) {
56: Map.Entry<?, ?> entry = (Map.Entry<?, ?>) object;
57: return (key == null ? entry.getKey() == null : key
58: .equals(entry.getKey()))
59: && (value == null ? entry.getValue() == null
60: : value.equals(entry.getValue()));
61: }
62: return false;
63: }
64:
65: public K getKey() {
66: return key;
67: }
68:
69: public V getValue() {
70: return value;
71: }
72:
73: @Override
74: public int hashCode() {
75: return (key == null ? 0 : key.hashCode())
76: ^ (value == null ? 0 : value.hashCode());
77: }
78:
79: public V setValue(V object) {
80: V result = value;
81: value = object;
82: return result;
83: }
84:
85: @Override
86: public String toString() {
87: return key + "=" + value;
88: }
89: }
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