01: /* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
02: *
03: * Licensed under the Apache License, Version 2.0 (the "License");
04: * you may not use this file except in compliance with the License.
05: * You may obtain a copy of the License at
06: *
07: * http://www.apache.org/licenses/LICENSE-2.0
08: *
09: * Unless required by applicable law or agreed to in writing, software
10: * distributed under the License is distributed on an "AS IS" BASIS,
11: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12: * See the License for the specific language governing permissions and
13: * limitations under the License.
14: */
15:
16: package org.acegisecurity.context;
17:
18: import org.springframework.util.Assert;
19:
20: /**
21: * A <code>ThreadLocal</code>-based implementation of {@link
22: * org.acegisecurity.context.SecurityContextHolderStrategy}.
23: *
24: * @author Ben Alex
25: * @version $Id: SecurityContextHolder.java 1324 2006-02-12 06:29:53Z benalex $
26: *
27: * @see java.lang.ThreadLocal
28: * @see org.acegisecurity.context.HttpSessionContextIntegrationFilter
29: */
30: public class ThreadLocalSecurityContextHolderStrategy implements
31: SecurityContextHolderStrategy {
32: //~ Static fields/initializers =====================================================================================
33:
34: private static ThreadLocal contextHolder = new ThreadLocal();
35:
36: //~ Methods ========================================================================================================
37:
38: public void clearContext() {
39: contextHolder.set(null);
40: }
41:
42: public SecurityContext getContext() {
43: if (contextHolder.get() == null) {
44: contextHolder.set(new SecurityContextImpl());
45: }
46:
47: return (SecurityContext) contextHolder.get();
48: }
49:
50: public void setContext(SecurityContext context) {
51: Assert
52: .notNull(context,
53: "Only non-null SecurityContext instances are permitted");
54: contextHolder.set(context);
55: }
56: }
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