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1
5
6 package org.exoplatform.commons.map;
7
8 import java.util.*;
9
10
15 public abstract class AbstractMap implements Map
16 {
17
19 protected abstract Object  getAttribute( String name );
20
21 protected abstract void setAttribute( String name, Object value );
22
23 protected abstract void removeAttribute( String name );
24
25 protected abstract Enumeration getAttributeNames();
26
27
28
30 public int size() {
31 int n = 0;
32 Enumeration keys = getAttributeNames();
33 while (keys.hasMoreElements()) {
34 String key = (String ) keys.nextElement();
35 n++;
36 }
37 return n;
38 }
39
40 public boolean isEmpty() {
41 return !getAttributeNames().hasMoreElements();
42 }
43
44 public boolean containsKey( Object key ) {
45 return (getAttribute( (String ) key ) != null);
46 }
47
48 public boolean containsValue( Object value ) {
49 boolean match = false;
50 Enumeration keys = getAttributeNames();
51 while (keys.hasMoreElements()) {
52 String key = (String ) keys.nextElement();
53 Object val = getAttribute( key );
54 if (value.equals( val )) {
55 match = true;
56 break;
57 }
58 }
59 return match;
60 }
61
62 public Object get( Object key ) {
63 return getAttribute( (String ) key );
64 }
65
66 public Object put( Object key, Object value ) {
67 Object result = null;
68 if (containsKey( key )) result = getAttribute( (String ) key );
69 setAttribute( (String ) key, value );
70 return result;
71 }
72
73 public Object remove( Object key ) {
74 Object result = getAttribute( (String ) key );
75 removeAttribute( (String ) key );
76 return result;
77 }
78
79 public void putAll( Map t ) {
80 for (Iterator i = t.keySet().iterator(); i.hasNext();) {
81 String key = (String ) i.next();
82 Object value = t.get( key );
83 put( key, value );
84 }
85 }
86
87 public void clear() {
88 throw new UnsupportedOperationException ();
89 }
90
91 public Set keySet() {
92 throw new UnsupportedOperationException ();
93 }
94
95 public Collection values() {
96 throw new UnsupportedOperationException ();
97 }
98
99 public Set entrySet() {
100 throw new UnsupportedOperationException ();
101 }
102
103 public String toString() {
104 StringBuffer b = new StringBuffer () ;
105 Enumeration keys = getAttributeNames();
106 while (keys.hasMoreElements()) {
107 String key = (String ) keys.nextElement();
108 b.append(key).append("\n") ;
109 }
110 return b.toString() ;
111 }
112 }
113 |
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