Source Code Cross Referenced for PageFlowActionServlet.java in  » Library » Apache-beehive-1.0.2-src » org » apache » beehive » netui » pageflow » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache beehive 1.0.2 src » org.apache.beehive.netui.pageflow 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         *
017:         * $Header:$
018:         */
019:        package org.apache.beehive.netui.pageflow;
020:
021:        import org.apache.beehive.netui.pageflow.internal.InternalConstants;
022:        import org.apache.beehive.netui.pageflow.internal.PageFlowRequestWrapper;
023:        import org.apache.beehive.netui.pageflow.internal.InternalUtils;
024:        import org.apache.beehive.netui.pageflow.internal.PageFlowInitialization;
025:        import org.apache.beehive.netui.pageflow.handler.Handlers;
026:        import org.apache.beehive.netui.pageflow.handler.FlowControllerHandlerContext;
027:        import org.apache.beehive.netui.pageflow.handler.ForwardRedirectHandler;
028:        import org.apache.beehive.netui.util.internal.InternalStringBuilder;
029:        import org.apache.beehive.netui.util.internal.ServletUtils;
030:        import org.apache.beehive.netui.util.logging.Logger;
031:        import org.apache.struts.config.ModuleConfig;
032:        import org.apache.struts.action.RequestProcessor;
033:
034:        import javax.servlet.ServletException;
035:        import javax.servlet.ServletContext;
036:        import javax.servlet.http.HttpServletRequest;
037:        import javax.servlet.http.HttpServletResponse;
038:        import java.io.Serializable;
039:        import java.io.IOException;
040:        import java.util.Map;
041:
042:        /**
043:         * ActionServlet that dynamically registers modules based on naming/location conventions for Struts
044:         * configuration files that are generated by the Page Flow compiler.  These files are located in
045:         * /WEB-INF/classes/_pageflow, and are named struts-config-<i>module-name</i>.xml.
046:         * For auto-registration of config files in other locations, the user may specify additional
047:         * {@link ModuleConfigLocator} classes in /WEB-INF/beehive-netui-config.xml using the
048:         * <code>&lt;module-config-locators&gt;</code> element. 
049:         */
050:        public class PageFlowActionServlet extends AutoRegisterActionServlet {
051:            private static final Logger _log = Logger
052:                    .getInstance(PageFlowActionServlet.class);
053:
054:            private Handlers _handlers;
055:
056:            private static final ModuleConfigLocator[] DEFAULT_MODULE_CONFIG_LOCATORS = {
057:                    new DefaultModuleConfigLocator(),
058:                    new LegacyModuleConfigLocator() };
059:
060:            /**
061:             * Get the base list of ModuleConfigLocators, to specify locations for auto-registered Struts modules.  By default,
062:             * this ActionServlet auto-registers Struts modules whose configuration files are located at
063:             * "/WEB-INF/classes/_pageflow/struts-config-<i>&lt;module&gt;</i>".  Overriding this method allows
064:             * alternate locations to be specified.  When an unrecognized Struts module is requested, each registered
065:             * ModuleConfigLocator is queried for a possible path to the configuration file for the module.  If the
066:             * configuration file is found, the module is auto-registered against the file.
067:             */
068:            protected ModuleConfigLocator[] getDefaultModuleConfigLocators() {
069:                return DEFAULT_MODULE_CONFIG_LOCATORS;
070:            }
071:
072:            /**
073:             * Default ModuleConfigLocator that looks for Struts module configuration files according to the pattern
074:             * "/WEB-INF/classes/_pageflow/struts-config-<i>&lt;module&gt;</i>".  An instance of this class
075:             * is registered by default.
076:             * 
077:             * @see PageFlowActionServlet#getDefaultModuleConfigLocators
078:             */
079:            public static class DefaultModuleConfigLocator implements 
080:                    ModuleConfigLocator, Serializable {
081:                public String getModuleConfigPath(String moduleName) {
082:                    InternalStringBuilder moduleConfPath = new InternalStringBuilder(
083:                            getGenDir());
084:                    moduleConfPath.append('/').append(
085:                            PageFlowConstants.PAGEFLOW_MODULE_CONFIG_PREFIX);
086:
087:                    if (moduleName.length() > 1) {
088:                        moduleConfPath.append(moduleName.replace('/', '-'));
089:                    }
090:
091:                    moduleConfPath
092:                            .append(PageFlowConstants.PAGEFLOW_MODULE_CONFIG_EXTENSION);
093:                    return moduleConfPath.toString();
094:                }
095:
096:                protected String getGenDir() {
097:                    return PageFlowConstants.PAGEFLOW_MODULE_CONFIG_GEN_DIR;
098:                }
099:            }
100:
101:            /**
102:             * ModuleConfigLocator that looks for legacy Struts module configuration files according to the pattern
103:             * "/WEB-INF/struts-config-<i>&lt;module&gt;</i>".  An instance of this class is registered by default.
104:             * 
105:             * @see PageFlowActionServlet#getDefaultModuleConfigLocators
106:             */
107:            protected static class LegacyModuleConfigLocator extends
108:                    DefaultModuleConfigLocator {
109:                protected String getGenDir() {
110:                    return InternalConstants.WEBINF_DIR;
111:                }
112:            }
113:
114:            public void init() throws ServletException {
115:                /* todo: NetUI 1.1 -- need to perform initialization in one place; the ServletContextListener */
116:                // Ensure that we get to do our initializations, even if there's no context listener registered in web.xml.
117:                ServletContext servletContext = getServletContext();
118:
119:                if (!PageFlowInitialization.isInit(servletContext)) {
120:                    PageFlowInitialization.performInitializations(
121:                            servletContext, null);
122:                }
123:
124:                _handlers = Handlers.get(servletContext);
125:
126:                super .init();
127:            }
128:
129:            protected void process(HttpServletRequest request,
130:                    HttpServletResponse response) throws IOException,
131:                    ServletException {
132:                // If this is a direct request for a shared flow (.jpfs) or a Faces backing bean (.jsfb), return a 404 status.
133:                // These are not web-addressable.
134:                String servletPath = InternalUtils
135:                        .getDecodedServletPath(request);
136:                if (servletPath
137:                        .endsWith(InternalConstants.SHARED_FLOW_EXTENSION)
138:                        || servletPath
139:                                .endsWith(InternalConstants.FACES_BACKING_EXTENSION)) {
140:                    if (_log.isDebugEnabled()) {
141:                        _log.debug("Attempt to hit restricted URI "
142:                                + servletPath + "; 404 error returned.");
143:                    }
144:
145:                    response.sendError(HttpServletResponse.SC_NOT_FOUND);
146:                    return;
147:                }
148:
149:                // First, reinitialize the page flow classloader, for reloading when recompile occurs in dev mode.
150:                FlowControllerHandlerContext handlerContext = new FlowControllerHandlerContext(
151:                        request, response, null);
152:                _handlers.getReloadableClassHandler().reloadClasses(
153:                        handlerContext);
154:
155:                super .process(request, response);
156:            }
157:
158:            /**
159:             * Get the webapp-relative path to the Struts module configration file for a given module path.  By default,
160:             * this is "/WEB-INF/classes/_pageflow/struts-config-<i>&lt;module&gt;</i>", but alternate
161:             * locations can be specified by adding {@link ModuleConfigLocator}s.  
162:             * 
163:             * @param modulePath the Struts module path.
164:             * @return a String that is the path to the Struts configuration file, relative to the web application root.
165:             * @see #getDefaultModuleConfigLocators
166:             */
167:            public String getModuleConfPath(String modulePath) {
168:                return super .getModuleConfPath(modulePath);
169:            }
170:
171:            /**
172:             * Struts keeps track of the action servlet URL pattern (e.g., *.do) so it can construct action
173:             * URIs.  We want to prevent it from noticing *.jpf so it doesn't use that to construct the URIs.
174:             * 
175:             * @exclude
176:             */
177:            public void addServletMapping(String servletName, String urlPattern) {
178:                if (!urlPattern.endsWith(PageFlowConstants.PAGEFLOW_EXTENSION)) {
179:                    super .addServletMapping(servletName, urlPattern);
180:                }
181:            }
182:
183:            /**
184:             * Tell whether the given module can handle the given path.  If this is the root module (path=="") and it's a 
185:             * Page Flow module, then it shouldn't try to handle any path that has a slash in it -- it only handles local
186:             * actions.
187:             */
188:            protected boolean moduleCanHandlePath(ModuleConfig moduleConfig,
189:                    RequestProcessor rp, String servletPath) {
190:                if (moduleConfig.getPrefix().equals("")
191:                        && servletPath.lastIndexOf('/') > 0
192:                        && rp instanceof  PageFlowRequestProcessor) {
193:                    return false;
194:                }
195:
196:                return true;
197:            }
198:
199:            /**
200:             * Last chance to handle an unhandled action URI.
201:             * @return <code>true</code> if this method handled it (by forwarding somewhere or writing to the response).
202:             */
203:            protected boolean processUnhandledAction(
204:                    HttpServletRequest request, HttpServletResponse response,
205:                    String uri) throws IOException, ServletException {
206:                //
207:                // First check to see if we're already in a forwarded fallback request.  If so, just bail.
208:                //
209:                PageFlowRequestWrapper rw = PageFlowRequestWrapper.get(request);
210:                if (rw.getOriginalServletPath() != null)
211:                    return false;
212:
213:                SharedFlowController sharedFlowToTry = null;
214:                String uriBaseName = ServletUtils.getBaseName(uri);
215:                int firstDot = uriBaseName.indexOf('.');
216:                int lastDot = uriBaseName.lastIndexOf('.');
217:
218:                if (firstDot != -1 && firstDot != lastDot) {
219:                    String sharedFlowName = uriBaseName.substring(0, firstDot);
220:
221:                    try {
222:                        RequestContext rc = new RequestContext(request,
223:                                response);
224:                        Map defaultSharedFlows = FlowControllerFactory.get(
225:                                getServletContext()).getDefaultSharedFlows(rc);
226:
227:                        if (defaultSharedFlows != null) {
228:                            sharedFlowToTry = (SharedFlowController) defaultSharedFlows
229:                                    .get(sharedFlowName);
230:                            uriBaseName = uriBaseName.substring(firstDot + 1);
231:                        }
232:                    } catch (ClassNotFoundException e) {
233:                        ServletUtils.throwServletException(e);
234:                    } catch (InstantiationException e) {
235:                        ServletUtils.throwServletException(e);
236:                    } catch (IllegalAccessException e) {
237:                        ServletUtils.throwServletException(e);
238:                    }
239:                } else {
240:                    sharedFlowToTry = FlowControllerFactory.getGlobalApp(
241:                            request, response, getServletContext());
242:                }
243:
244:                //
245:                // If we couldn't find an appropriate module, try raising the action on the (deprecated) Global.app.
246:                //
247:
248:                if (sharedFlowToTry != null) {
249:                    InternalStringBuilder sfActionURI = new InternalStringBuilder(
250:                            sharedFlowToTry.getModulePath());
251:                    sfActionURI.append('/');
252:                    sfActionURI.append(uriBaseName);
253:                    rw.setOriginalServletPath(uri);
254:                    ForwardRedirectHandler frh = _handlers
255:                            .getForwardRedirectHandler();
256:                    FlowControllerHandlerContext context = new FlowControllerHandlerContext(
257:                            request, response, null);
258:                    frh.forward(context, sfActionURI.toString());
259:                    return true;
260:                }
261:
262:                return false;
263:            }
264:        }
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