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Java > Open Source Codes > org > springframework > aop > TrueClassFilter


1 /*
2  * Copyright 2002-2006 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.springframework.aop;
18
19 import java.io.Serializable JavaDoc;
20
21 /**
22  * Canonical ClassFilter instance that matches all classes.
23  *
24  * @author Rod Johnson
25  */
26 class TrueClassFilter implements ClassFilter, Serializable JavaDoc {
27     
28     public static final TrueClassFilter INSTANCE = new TrueClassFilter();
29     
30     /**
31      * Enforce Singleton pattern.
32      */
33     private TrueClassFilter() {
34     }
35
36     public boolean matches(Class JavaDoc clazz) {
37         return true;
38     }
39     
40     /**
41      * Required to support serialization. Replaces with canonical
42      * instance on deserialization, protecting Singleton pattern.
43      * Alternative to overriding <code>equals()</code>.
44      */
45     private Object JavaDoc readResolve() {
46         return INSTANCE;
47     }
48
49     public String JavaDoc toString() {
50         return "ClassFilter.TRUE";
51     }
52
53 }
54
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