Source Code Cross Referenced for DispatchActionSupport.java in  » J2EE » spring-framework-2.0.6 » org » springframework » web » struts » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.web.struts 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2005 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.web.struts;
018:
019:        import java.io.File;
020:
021:        import javax.servlet.ServletContext;
022:
023:        import org.apache.struts.action.ActionServlet;
024:        import org.apache.struts.actions.DispatchAction;
025:
026:        import org.springframework.context.support.MessageSourceAccessor;
027:        import org.springframework.web.context.WebApplicationContext;
028:        import org.springframework.web.util.WebUtils;
029:
030:        /**
031:         * Convenience class for Spring-aware Struts 1.1+ DispatchActions.
032:         *
033:         * <p>Provides a reference to the current Spring application context, e.g.
034:         * for bean lookup or resource loading. Auto-detects a ContextLoaderPlugIn
035:         * context, falling back to the root WebApplicationContext. For typical
036:         * usage, i.e. accessing middle tier beans, use a root WebApplicationContext.
037:         *
038:         * <p>For classic Struts Actions or Lookup/MappingDispatchActions, use the
039:         * analogous {@link ActionSupport ActionSupport} or
040:         * {@link LookupDispatchActionSupport LookupDispatchActionSupport} /
041:         * {@link MappingDispatchActionSupport MappingDispatchActionSupport} class,
042:         * respectively.
043:         *
044:         * <p>As an alternative approach, you can wire your Struts Actions themselves
045:         * as Spring beans, passing references to them via IoC rather than looking
046:         * up references in a programmatic fashion. Check out
047:         * {@link DelegatingActionProxy DelegatingActionProxy} and
048:         * {@link DelegatingRequestProcessor DelegatingRequestProcessor}.
049:         *
050:         * @author Juergen Hoeller
051:         * @since 1.0.1
052:         * @see ContextLoaderPlugIn#SERVLET_CONTEXT_PREFIX
053:         * @see org.springframework.web.context.WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE
054:         * @see org.springframework.web.context.ContextLoaderListener
055:         * @see org.springframework.web.context.ContextLoaderServlet
056:         * @see ActionSupport
057:         * @see LookupDispatchActionSupport
058:         * @see MappingDispatchActionSupport
059:         * @see DelegatingActionProxy
060:         * @see DelegatingRequestProcessor
061:         */
062:        public abstract class DispatchActionSupport extends DispatchAction {
063:
064:            private WebApplicationContext webApplicationContext;
065:
066:            private MessageSourceAccessor messageSourceAccessor;
067:
068:            /**
069:             * Initialize the WebApplicationContext for this Action.
070:             * Invokes onInit after successful initialization of the context.
071:             * @see #initWebApplicationContext
072:             * @see #onInit
073:             */
074:            public void setServlet(ActionServlet actionServlet) {
075:                super .setServlet(actionServlet);
076:                if (actionServlet != null) {
077:                    this .webApplicationContext = initWebApplicationContext(actionServlet);
078:                    this .messageSourceAccessor = new MessageSourceAccessor(
079:                            this .webApplicationContext);
080:                    onInit();
081:                } else {
082:                    onDestroy();
083:                }
084:            }
085:
086:            /**
087:             * Fetch ContextLoaderPlugIn's WebApplicationContext from the ServletContext,
088:             * falling back to the root WebApplicationContext (the usual case).
089:             * @param actionServlet the associated ActionServlet
090:             * @return the WebApplicationContext
091:             * @throws IllegalStateException if no WebApplicationContext could be found
092:             * @see DelegatingActionUtils#findRequiredWebApplicationContext
093:             */
094:            protected WebApplicationContext initWebApplicationContext(
095:                    ActionServlet actionServlet) throws IllegalStateException {
096:
097:                return DelegatingActionUtils.findRequiredWebApplicationContext(
098:                        actionServlet, null);
099:            }
100:
101:            /**
102:             * Return the current Spring WebApplicationContext.
103:             */
104:            protected final WebApplicationContext getWebApplicationContext() {
105:                return this .webApplicationContext;
106:            }
107:
108:            /**
109:             * Return a MessageSourceAccessor for the application context
110:             * used by this object, for easy message access.
111:             */
112:            protected final MessageSourceAccessor getMessageSourceAccessor() {
113:                return this .messageSourceAccessor;
114:            }
115:
116:            /**
117:             * Return the current ServletContext.
118:             */
119:            protected final ServletContext getServletContext() {
120:                return this .webApplicationContext.getServletContext();
121:            }
122:
123:            /**
124:             * Return the temporary directory for the current web application,
125:             * as provided by the servlet container.
126:             * @return the File representing the temporary directory
127:             */
128:            protected final File getTempDir() {
129:                return WebUtils.getTempDir(getServletContext());
130:            }
131:
132:            /**
133:             * Callback for custom initialization after the context has been set up.
134:             * @see #setServlet
135:             */
136:            protected void onInit() {
137:            }
138:
139:            /**
140:             * Callback for custom destruction when the ActionServlet shuts down.
141:             * @see #setServlet
142:             */
143:            protected void onDestroy() {
144:            }
145:
146:        }
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