1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists.impl;
// standard collections
import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.TransformedList;
import ca.odell.glazedlists.event.ListEvent;
import java.util.Collection;
import java.util.List;
/**
* An {@link EventList} that does not allow writing operations.
*
* <p>The {@link ReadOnlyList} is useful for programming defensively. A
* {@link ReadOnlyList} is useful to supply an unknown class read-only access
* to your {@link EventList}.
*
* <p>The {@link ReadOnlyList} provides an up-to-date view of its source
* {@link EventList} so changes to the source {@link EventList} will still be
* reflected. For a static copy of any {@link EventList} it is necessary to copy
* the contents of that {@link EventList} into any {@link List}.
*
* <p>{@link ReadOnlyList} does not alter the runtime performance
* characteristics of the source {@link EventList}.
*
* <p><strong><font color="#FF0000">Warning:</font></strong> This class is
* thread ready but not thread safe. See {@link EventList} for an example
* of thread safe code.
*
* @see TransformedList
*
* @author <a href="mailto:jesse@swank.ca">Jesse Wilson</a>
*/
public final class ReadOnlyList<E> extends TransformedList<E, E> {
/**
* Creates a {@link ReadOnlyList} to provide a view of an {@link EventList}
* that does not allow write operations.
*/
public ReadOnlyList(EventList<E> source) {
super(source);
source.addListEventListener(this);
}
/**
* @return <tt>false</tt>; ReadOnlyList is... ahem... readonly
*/
@Override
protected boolean isWritable() {
return false;
}
/** {@inheritDoc} */
@Override
public void listChanged(ListEvent<E> listChanges) {
// just pass on the changes
updates.forwardEvent(listChanges);
}
//
// All accessor methods must call to the source list so as not to
// disturb the performance characteristics of the source list algorithms.
//
/** {@inheritDoc} */
@Override
public boolean contains(Object object) {
return source.contains(object);
}
/** {@inheritDoc} */
@Override
public Object[] toArray() {
return source.toArray();
}
/** {@inheritDoc} */
@Override
public <T>T[] toArray(T[] array) {
return source.toArray(array);
}
/** {@inheritDoc} */
@Override
public boolean containsAll(Collection<?> values) {
return source.containsAll(values);
}
/** {@inheritDoc} */
@Override
public int indexOf(Object object) {
return source.indexOf(object);
}
/** {@inheritDoc} */
@Override
public int lastIndexOf(Object object) {
return source.lastIndexOf(object);
}
/** {@inheritDoc} */
@Override
public boolean equals(Object object) {
return source.equals(object);
}
/** {@inheritDoc} */
@Override
public int hashCode() {
return source.hashCode();
}
//
// All mutator methods should throw an UnsupportedOperationException with
// a descriptive message explaining why mutations are disallowed.
//
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public boolean add(E value) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public void add(int index, E value) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public boolean addAll(Collection<? extends E> values) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public boolean addAll(int index, Collection<? extends E> values) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public void clear() {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public boolean remove(Object toRemove) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public E remove(int index) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public boolean removeAll(Collection<?> collection) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public boolean retainAll(Collection<?> values) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
/** @throws UnsupportedOperationException since ReadOnlyList cannot be modified */
@Override
public E set(int index, E value) {
throw new UnsupportedOperationException("ReadOnlyList cannot be modified");
}
}
|
