01: /*
02: * Copyright 2002-2006 the original author or authors.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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;
20:
21: /**
22: * Canonical ClassFilter instance that matches all classes.
23: *
24: * @author Rod Johnson
25: */
26: class TrueClassFilter implements ClassFilter, Serializable {
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 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 readResolve() {
46: return INSTANCE;
47: }
48:
49: public String toString() {
50: return "ClassFilter.TRUE";
51: }
52:
53: }
|