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1 package freemarker.template;
2
3 import java.util.Collection  ;
4 import java.util.Collections ;
5 import java.util.Map ;
6 import java.util.Set ;
7
8 public class EmptyMap implements Map , Cloneable {
9 public static final EmptyMap instance = new EmptyMap();
10
11 public void clear() {
12 throw new UnsupportedOperationException ("This Map is read-only.");
13 }
14
15 public boolean containsKey(Object arg0) {
16 return false;
17 }
18
19 public boolean containsValue(Object arg0) {
20 return false;
21 }
22
23 public Set entrySet() {
24 return Collections.EMPTY_SET;
25 }
26
27 public Object get(Object arg0) {
28 return null;
29 }
30
31 public boolean isEmpty() {
32 return true;
33 }
34
35 public Set keySet() {
36 return Collections.EMPTY_SET;
37 }
38
39 public Object put(Object arg0, Object arg1) {
40 throw new UnsupportedOperationException ("This Map is read-only.");
41 }
42
43 public void putAll(Map arg0) {
44 throw new UnsupportedOperationException ("This Map is read-only.");
45 }
46
47 public Object remove(Object arg0) {
48 throw new UnsupportedOperationException ("This Map is read-only.");
49 }
50
51 public int size() {
52 return 0;
53 }
54
55 public Collection values() {
56 return Collections.EMPTY_LIST;
57 }
58
59 }
60 |
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