blob: 6a5dd5c461bbe4e6e53a21c8976cfc79fc0fe7aa (
plain)
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
|
// Copyright (C) 2011 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.common.data;
import com.google.gerrit.reviewdb.client.AccountGroup;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/** In-memory table of {@link GroupInfo}, indexed by {@link AccountGroup.Id}. */
public class GroupInfoCache {
private static final GroupInfoCache EMPTY;
static {
EMPTY = new GroupInfoCache();
EMPTY.groups = Collections.emptyMap();
}
/** Obtain an empty cache singleton. */
public static GroupInfoCache empty() {
return EMPTY;
}
protected Map<AccountGroup.Id, GroupInfo> groups;
protected GroupInfoCache() {
}
public GroupInfoCache(final Iterable<GroupInfo> list) {
groups = new HashMap<AccountGroup.Id, GroupInfo>();
for (final GroupInfo gi : list) {
groups.put(gi.getId(), gi);
}
}
/**
* Lookup the group summary
* <p>
* The return value can take on one of three forms:
* <ul>
* <li><code>null</code>, if <code>id == null</code>.</li>
* <li>a valid info block, if <code>id</code> was loaded.</li>
* <li>an anonymous info block, if <code>id</code> was not loaded.</li>
* </ul>
*
* @param id the id desired.
* @return info block for the group.
*/
public GroupInfo get(final AccountGroup.Id id) {
if (id == null) {
return null;
}
GroupInfo r = groups.get(id);
if (r == null) {
r = new GroupInfo(id);
groups.put(id, r);
}
return r;
}
/** Merge the information from another cache into this one. */
public void merge(final GroupInfoCache other) {
assert this != EMPTY;
groups.putAll(other.groups);
}
}
|
