01: /*
02: * Copyright (C) 2004 NNL Technology AB
03: * Visit www.infonode.net for information about InfoNode(R)
04: * products and how to contact NNL Technology AB.
05: *
06: * This program is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU General Public License
08: * as published by the Free Software Foundation; either version 2
09: * of the License, or (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: * GNU General Public License for more details.
15: *
16: * You should have received a copy of the GNU General Public License
17: * along with this program; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
19: * MA 02111-1307, USA.
20: */
21:
22: // $Id: SingleValueMap.java,v 1.3 2005/02/16 10:21:02 johan Exp $
23: package net.infonode.util.collection.map;
24:
25: import net.infonode.util.Utils;
26: import net.infonode.util.collection.map.base.ConstMap;
27: import net.infonode.util.collection.map.base.ConstMapIterator;
28:
29: /**
30: * @author $Author: johan $
31: * @version $Revision: 1.3 $
32: */
33: public class SingleValueMap implements ConstMap {
34: private Object key;
35: private Object value;
36:
37: public SingleValueMap(Object key, Object value) {
38: this .key = key;
39: this .value = value;
40: }
41:
42: public Object get(Object key) {
43: return Utils.equals(key, this .key) ? value : null;
44: }
45:
46: public boolean containsKey(Object key) {
47: return Utils.equals(key, this .key);
48: }
49:
50: public boolean containsValue(Object value) {
51: return Utils.equals(value, this .value);
52: }
53:
54: public ConstMapIterator constIterator() {
55: return new ConstMapIterator() {
56: private boolean done;
57:
58: public Object getKey() {
59: return key;
60: }
61:
62: public Object getValue() {
63: return value;
64: }
65:
66: public void next() {
67: done = true;
68: }
69:
70: public boolean atEntry() {
71: return !done;
72: }
73: };
74: }
75:
76: public boolean isEmpty() {
77: return false;
78: }
79:
80: }
|