| 1 | /* |
| 2 | Copyright (C) 2004 MySQL AB |
| 3 | |
| 4 | This program is free software; you can redistribute it and/or modify |
| 5 | it under the terms of the GNU General Public License version 2 as |
| 6 | published by the Free Software Foundation. |
| 7 | |
| 8 | This program is distributed in the hope that it will be useful, |
| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | GNU General Public License for more details. |
| 12 | |
| 13 | You should have received a copy of the GNU General Public License |
| 14 | along with this program; if not, write to the Free Software |
| 15 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 16 | |
| 17 | */ |
| 18 | package com.mysql.management.util; |
| 19 | |
| 20 | import java.util.Map; |
| 21 | |
| 22 | /** |
| 23 | * Simple (and obvious) implementation of java.util.Map.Entry |
| 24 | * |
| 25 | * This class is final simply as a hint to the compiler, it may be un-finalized |
| 26 | * safely. |
| 27 | * |
| 28 | * @author Eric Herman <eric@mysql.com> |
| 29 | * @version $Id: MapEntry.java,v 1.5 2005/09/22 20:41:36 eherman Exp $ |
| 30 | */ |
| 31 | public final class MapEntry implements Map.Entry { |
| 32 | private Object key; |
| 33 | |
| 34 | private Object value; |
| 35 | |
| 36 | private Equals equals; |
| 37 | |
| 38 | public MapEntry(Object key, Object value) { |
| 39 | this.key = key; |
| 40 | this.value = value; |
| 41 | this.equals = new Equals(); |
| 42 | } |
| 43 | |
| 44 | public Object getKey() { |
| 45 | return key; |
| 46 | } |
| 47 | |
| 48 | public Object getValue() { |
| 49 | return value; |
| 50 | } |
| 51 | |
| 52 | public Object setValue(Object value) { |
| 53 | Object oldVal = this.value; |
| 54 | this.value = value; |
| 55 | return oldVal; |
| 56 | } |
| 57 | |
| 58 | public boolean equals(Object obj) { |
| 59 | if (!(obj instanceof Map.Entry)) { |
| 60 | return false; |
| 61 | } |
| 62 | return equals((Map.Entry) obj); |
| 63 | } |
| 64 | |
| 65 | public boolean equals(Map.Entry other) { |
| 66 | if (other == this) { |
| 67 | return true; |
| 68 | } |
| 69 | |
| 70 | if ((other == null) || (hashCode() != other.hashCode())) { |
| 71 | return false; |
| 72 | } |
| 73 | |
| 74 | return equals.nullSafe(key, other.getKey()) |
| 75 | && equals.nullSafe(value, other.getValue()); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * XOR of the key and value hashCodes. (Zero used for nulls) as defined by |
| 80 | * Map.Entry java doc. |
| 81 | */ |
| 82 | public int hashCode() { |
| 83 | int keyHashCode = (key == null) ? 0 : key.hashCode(); |
| 84 | int valHashCode = (value == null) ? 0 : value.hashCode(); |
| 85 | return keyHashCode ^ valHashCode; |
| 86 | } |
| 87 | |
| 88 | public String toString() { |
| 89 | return getKey() + "=" + getValue(); |
| 90 | } |
| 91 | } |