Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
AbstractFactory |
|
| 1.8;1.8 |
1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one | |
3 | * or more contributor license agreements. See the NOTICE file | |
4 | * distributed with this work for additional information | |
5 | * regarding copyright ownership. The ASF licenses this file | |
6 | * to you under the Apache License, Version 2.0 (the | |
7 | * "License"); you may not use this file except in compliance | |
8 | * with the License. You may obtain a copy of the License at | |
9 | * | |
10 | * http://www.apache.org/licenses/LICENSE-2.0 | |
11 | * | |
12 | * Unless required by applicable law or agreed to in writing, | |
13 | * software distributed under the License is distributed on an | |
14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
15 | * KIND, either express or implied. See the License for the | |
16 | * specific language governing permissions and limitations | |
17 | * under the License. | |
18 | */ | |
19 | package org.apache.shiro.util; | |
20 | ||
21 | /** | |
22 | * TODO - Class JavaDoc | |
23 | * | |
24 | * @since 1.0 | |
25 | */ | |
26 | public abstract class AbstractFactory<T> implements Factory<T> { | |
27 | ||
28 | private boolean singleton; | |
29 | private T singletonInstance; | |
30 | ||
31 | 23 | public AbstractFactory() { |
32 | 23 | this.singleton = true; |
33 | 23 | } |
34 | ||
35 | public boolean isSingleton() { | |
36 | 12 | return singleton; |
37 | } | |
38 | ||
39 | public void setSingleton(boolean singleton) { | |
40 | 0 | this.singleton = singleton; |
41 | 0 | } |
42 | ||
43 | public T getInstance() { | |
44 | T instance; | |
45 | 12 | if (isSingleton()) { |
46 | 12 | if (this.singletonInstance == null) { |
47 | 12 | this.singletonInstance = createInstance(); |
48 | } | |
49 | 12 | instance = this.singletonInstance; |
50 | } else { | |
51 | 0 | instance = createInstance(); |
52 | } | |
53 | 12 | if (instance == null) { |
54 | 0 | String msg = "Factory 'createInstance' implementation returned a null object."; |
55 | 0 | throw new IllegalStateException(msg); |
56 | } | |
57 | 12 | return instance; |
58 | } | |
59 | ||
60 | protected abstract T createInstance(); | |
61 | } |