Source Code Cross Referenced for AbstractRequestAttributes.java in  » J2EE » spring-framework-2.5 » org » springframework » web » context » request » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.web.context.request 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2007 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.web.context.request;
18:
19:        import java.util.Iterator;
20:        import java.util.LinkedHashMap;
21:        import java.util.Map;
22:
23:        import org.springframework.util.Assert;
24:
25:        /**
26:         * Abstract support class for RequestAttributes implementations,
27:         * offering a request completion mechanism for request-specific destruction
28:         * callbacks and for updating accessed session attributes.
29:         *
30:         * @author Juergen Hoeller
31:         * @since 2.0
32:         * @see #requestCompleted()
33:         */
34:        public abstract class AbstractRequestAttributes implements 
35:                RequestAttributes {
36:
37:            /** Map from attribute name String to destruction callback Runnable */
38:            protected final Map requestDestructionCallbacks = new LinkedHashMap(
39:                    8);
40:
41:            /**
42:             * Signal that the request has been completed.
43:             * <p>Executes all request destruction callbacks and updates the
44:             * session attributes that have been accessed during request processing.
45:             */
46:            public void requestCompleted() {
47:                executeRequestDestructionCallbacks();
48:                updateAccessedSessionAttributes();
49:            }
50:
51:            /**
52:             * Register the given callback as to be executed after request completion.
53:             * @param name the name of the attribute to register the callback for
54:             * @param callback the callback to be executed for destruction
55:             */
56:            protected final void registerRequestDestructionCallback(
57:                    String name, Runnable callback) {
58:                Assert.notNull(name, "Name must not be null");
59:                Assert.notNull(callback, "Callback must not be null");
60:                this .requestDestructionCallbacks.put(name, callback);
61:            }
62:
63:            /**
64:             * Remove the request destruction callback for the specified attribute, if any.
65:             * @param name the name of the attribute to remove the callback for
66:             */
67:            protected final void removeRequestDestructionCallback(String name) {
68:                Assert.notNull(name, "Name must not be null");
69:                this .requestDestructionCallbacks.remove(name);
70:            }
71:
72:            /**
73:             * Execute all callbacks that have been registered for execution
74:             * after request completion.
75:             */
76:            private void executeRequestDestructionCallbacks() {
77:                for (Iterator it = this .requestDestructionCallbacks.values()
78:                        .iterator(); it.hasNext();) {
79:                    ((Runnable) it.next()).run();
80:                }
81:                this .requestDestructionCallbacks.clear();
82:            }
83:
84:            /**
85:             * Update all session attributes that have been accessed during request processing,
86:             * to expose their potentially updated state to the underlying session manager.
87:             */
88:            protected abstract void updateAccessedSessionAttributes();
89:
90:        }
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