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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
AbstractEngine.java | 66.7% | 76.1% | 63.3% | 72.1% |
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// Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.tapestry.engine;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import java.util.Locale;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import org.apache.commons.lang.builder.ToStringBuilder;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hivemind.ApplicationRuntimeException;
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import org.apache.hivemind.ClassResolver;
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import org.apache.hivemind.util.Defense;
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import org.apache.tapestry.ApplicationServlet;
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import org.apache.tapestry.Constants;
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import org.apache.tapestry.IEngine;
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import org.apache.tapestry.IPage;
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import org.apache.tapestry.IRequestCycle;
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import org.apache.tapestry.PageRedirectException;
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import org.apache.tapestry.RedirectException;
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import org.apache.tapestry.StaleLinkException;
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import org.apache.tapestry.StaleSessionException;
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import org.apache.tapestry.Tapestry;
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import org.apache.tapestry.TapestryConstants;
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import org.apache.tapestry.listener.ListenerMap;
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import org.apache.tapestry.request.RequestContext;
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import org.apache.tapestry.services.DataSqueezer;
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import org.apache.tapestry.services.Infrastructure;
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import org.apache.tapestry.spec.IApplicationSpecification;
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import org.apache.tapestry.web.WebRequest;
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import org.apache.tapestry.web.WebResponse;
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/**
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* Basis for building real Tapestry applications. Immediate subclasses provide different strategies
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* for managing page state and other resources between request cycles.
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* <p>
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* Note: much of this description is <em>in transition</em> as part of Tapestry 4.0. All ad-hoc
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* singletons and such are being replaced with HiveMind services.
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* <p>
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* Uses a shared instance of {@link ITemplateSource},{@link ISpecificationSource},
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* {@link IScriptSource}and {@link IComponentMessagesSource}stored as attributes of the
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* {@link ServletContext}(they will be shared by all sessions).
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* <p>
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* An engine is designed to be very lightweight. Particularily, it should <b>never </b> hold
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* references to any {@link IPage}or {@link org.apache.tapestry.IComponent}objects. The entire
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* system is based upon being able to quickly rebuild the state of any page(s).
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* <p>
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* Where possible, instance variables should be transient. They can be restored inside
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* {@link #setupForRequest(RequestContext)}.
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* <p>
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* In practice, a subclass (usually {@link BaseEngine}) is used without subclassing. Instead, a
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* visit object is specified. To facilitate this, the application specification may include a
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* property, <code>org.apache.tapestry.visit-class</code> which is the class name to instantiate
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* when a visit object is first needed. See {@link #createVisit(IRequestCycle)}for more details.
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* <p>
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* Some of the classes' behavior is controlled by JVM system properties (typically only used during
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* development): <table border=1>
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* <tr>
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* <th>Property</th>
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* <th>Description</th>
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* </tr>
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* <tr>
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* <td>org.apache.tapestry.enable-reset-service</td>
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* <td>If true, enabled an additional service, reset, that allow page, specification and template
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* caches to be cleared on demand. See {@link #isResetServiceEnabled()}.</td>
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* </tr>
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* <tr>
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* <td>org.apache.tapestry.disable-caching</td>
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* <td>If true, then the page, specification, template and script caches will be cleared after each
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* request. This slows things down, but ensures that the latest versions of such files are used.
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* Care should be taken that the source directories for the files preceeds any versions of the files
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* available in JARs or WARs.</td>
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* </tr>
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* </table>
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*
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* @author Howard Lewis Ship
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*/
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public abstract class AbstractEngine implements IEngine |
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{ |
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private static final Log LOG = LogFactory.getLog(AbstractEngine.class); |
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/**
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* The link to the world of HiveMind services.
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*
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* @since 4.0
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*/
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private Infrastructure _infrastructure;
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private ListenerMap _listeners;
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/**
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* The curent locale for the engine, which may be changed at any time.
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*/
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private Locale _locale;
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/**
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* The name of the application specification property used to specify the class of the visit
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* object.
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*/
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public static final String VISIT_CLASS_PROPERTY_NAME = "org.apache.tapestry.visit-class"; |
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/**
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* @see org.apache.tapestry.error.ExceptionPresenter
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*/
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128 | 25 |
protected void activateExceptionPage(IRequestCycle cycle, Throwable cause) |
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{ |
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_infrastructure.getExceptionPresenter().presentException(cycle, cause); |
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} |
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/**
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* Writes a detailed report of the exception to <code>System.err</code>.
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*
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* @see org.apache.tapestry.error.RequestExceptionReporter
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*/
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public void reportException(String reportTitle, Throwable ex) |
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{ |
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_infrastructure.getRequestExceptionReporter().reportRequestException(reportTitle, ex); |
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} |
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/**
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* Invoked at the end of the request cycle to release any resources specific to the request
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* cycle.
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*/
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protected abstract void cleanupAfterRequest(IRequestCycle cycle); |
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/**
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* Returns the locale for the engine. This is initially set by the {@link ApplicationServlet}
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* but may be updated by the application.
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*/
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156 | 512 |
public Locale getLocale()
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{ |
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return _locale;
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} |
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/**
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* Returns a service with the given name.
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*
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* @see Infrastructure#getServiceMap()
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* @see org.apache.tapestry.services.ServiceMap
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*/
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public IEngineService getService(String name)
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{ |
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return _infrastructure.getServiceMap().getService(name);
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} |
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/** @see Infrastructure#getApplicationSpecification() */
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public IApplicationSpecification getSpecification()
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{ |
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return _infrastructure.getApplicationSpecification();
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} |
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/** @see Infrastructure#getSpecificationSource() */
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public ISpecificationSource getSpecificationSource()
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{ |
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return _infrastructure.getSpecificationSource();
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} |
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/**
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* Invoked, typically, when an exception occurs while servicing the request. This method resets
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* the output, sets the new page and renders it.
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*/
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192 | 4 |
protected void redirect(String pageName, IRequestCycle cycle, |
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ApplicationRuntimeException exception) throws IOException
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{ |
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195 | 4 |
IPage page = cycle.getPage(pageName); |
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cycle.activate(page); |
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renderResponse(cycle); |
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} |
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/**
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* Delegates to
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* {@link org.apache.tapestry.services.ResponseRenderer#renderResponse(IRequestCycle)}.
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*/
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207 | 6 |
public void renderResponse(IRequestCycle cycle) throws IOException |
208 |
{ |
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_infrastructure.getResponseRenderer().renderResponse(cycle); |
210 |
} |
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/**
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* Delegate method for the servlet. Services the request.
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*/
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216 | 148 |
public void service(WebRequest request, WebResponse response) throws IOException |
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{ |
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IRequestCycle cycle = null;
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IMonitor monitor = null;
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220 | 148 |
IEngineService service = null;
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222 | 148 |
if (_infrastructure == null) |
223 | 53 |
_infrastructure = (Infrastructure) request.getAttribute(Constants.INFRASTRUCTURE_KEY); |
224 |
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225 | 148 |
try
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{ |
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227 | 148 |
try
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{ |
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cycle = _infrastructure.getRequestCycleFactory().newRequestCycle(this);
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231 | 148 |
monitor = cycle.getMonitor(); |
232 | 148 |
service = cycle.getService(); |
233 |
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234 | 148 |
monitor.serviceBegin(service.getName(), _infrastructure.getRequest() |
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.getRequestURI()); |
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// Invoke the service, which returns true if it may have changed
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// the state of the engine (most do return true).
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240 | 148 |
service.service(cycle); |
241 |
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return;
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} |
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catch (PageRedirectException ex)
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{ |
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handlePageRedirectException(cycle, ex); |
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} |
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catch (RedirectException ex)
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{ |
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250 | 0 |
handleRedirectException(cycle, ex); |
251 |
} |
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catch (StaleLinkException ex)
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{ |
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254 | 1 |
handleStaleLinkException(cycle, ex); |
255 |
} |
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catch (StaleSessionException ex)
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{ |
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258 | 3 |
handleStaleSessionException(cycle, ex); |
259 |
} |
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} |
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catch (Exception ex)
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{ |
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263 | 25 |
monitor.serviceException(ex); |
264 |
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// Attempt to switch to the exception page. However, this may itself
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// fail for a number of reasons, in which case a ApplicationRuntimeException is
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// thrown.
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269 | 25 |
if (LOG.isDebugEnabled())
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270 | 0 |
LOG.debug("Uncaught exception", ex);
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272 | 25 |
activateExceptionPage(cycle, ex); |
273 |
} |
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274 |
finally
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{ |
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276 | 148 |
if (service != null) |
277 | 148 |
monitor.serviceEnd(service.getName()); |
278 |
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279 | 148 |
try
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280 |
{ |
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281 | 148 |
cycle.cleanup(); |
282 | 148 |
_infrastructure.getApplicationStateManager().flush(); |
283 |
} |
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284 |
catch (Exception ex)
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285 |
{ |
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286 | 0 |
reportException(Tapestry.getMessage("AbstractEngine.exception-during-cleanup"), ex);
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287 |
} |
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288 |
} |
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} |
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290 |
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/**
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* Handles {@link PageRedirectException} which involves executing
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* {@link IPage#validate(IRequestCycle)}on the target page (of the exception), until either a
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* loop is found, or a page succesfully validates and can be activated.
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* <p>
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* This should generally not be overriden in subclasses.
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*
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* @since 3.0
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*/
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300 |
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301 | 3 |
protected void handlePageRedirectException(IRequestCycle cycle, PageRedirectException exception) |
302 |
throws IOException, ServletException
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{ |
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304 | 3 |
List pageNames = new ArrayList();
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305 |
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306 | 3 |
String pageName = exception.getTargetPageName(); |
307 |
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308 | 3 |
while (true) |
309 |
{ |
|
310 | 5 |
if (pageNames.contains(pageName))
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311 |
{ |
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312 |
// Add the offending page to pageNames so it shows in the
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313 |
// list.
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314 |
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315 | 1 |
pageNames.add(pageName); |
316 |
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317 | 1 |
StringBuffer buffer = new StringBuffer();
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318 | 1 |
int count = pageNames.size();
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319 |
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320 | 1 |
for (int i = 0; i < count; i++) |
321 |
{ |
|
322 | 3 |
if (i > 0)
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323 | 2 |
buffer.append("; ");
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324 |
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325 | 3 |
buffer.append(pageNames.get(i)); |
326 |
} |
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327 |
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328 | 1 |
throw new ApplicationRuntimeException(Tapestry.format( |
329 |
"AbstractEngine.validate-cycle",
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buffer.toString())); |
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331 |
} |
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332 |
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// Record that this page has been a target.
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335 | 4 |
pageNames.add(pageName); |
336 |
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337 | 4 |
try
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338 |
{ |
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339 |
// Attempt to activate the new page.
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340 |
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341 | 4 |
cycle.activate(pageName); |
342 |
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343 | 2 |
break;
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344 |
} |
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catch (PageRedirectException ex2)
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{ |
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347 | 2 |
pageName = ex2.getTargetPageName(); |
348 |
} |
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349 |
} |
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350 |
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351 | 2 |
renderResponse(cycle); |
352 |
} |
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353 |
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354 |
/**
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355 |
* Invoked by {@link #service(RequestContext)}if a {@link StaleLinkException}is thrown by the
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356 |
* {@link IEngineService service}. This implementation sets the message property of the
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357 |
* StaleLink page to the message provided in the exception, then invokes
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358 |
* {@link #redirect(String, IRequestCycle, ApplicationRuntimeException)}to render the StaleLink
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359 |
* page.
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360 |
* <p>
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361 |
* Subclasses may overide this method (without invoking this implementation). A common practice
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362 |
* is to present an error message on the application's Home page.
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363 |
* <p>
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364 |
* Alternately, the application may provide its own version of the StaleLink page, overriding
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365 |
* the framework's implementation (probably a good idea, because the default page hints at
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|
366 |
* "application errors" and isn't localized). The overriding StaleLink implementation must
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367 |
* implement a message property of type String.
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|
368 |
*
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|
369 |
* @since 0.2.10
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|
370 |
*/
|
|
371 |
|
|
372 | 1 |
protected void handleStaleLinkException(IRequestCycle cycle, StaleLinkException exception) |
373 |
throws IOException
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|
374 |
{ |
|
375 | 1 |
String staleLinkPageName = getStaleLinkPageName(); |
376 | 1 |
IPage page = cycle.getPage(staleLinkPageName); |
377 |
|
|
378 | 1 |
page.setProperty("message", exception.getMessage());
|
379 |
|
|
380 | 1 |
redirect(staleLinkPageName, cycle, exception); |
381 |
} |
|
382 |
|
|
383 |
/**
|
|
384 |
* Invoked by {@link #service(RequestContext)}if a {@link StaleSessionException}is thrown by
|
|
385 |
* the {@link IEngineService service}. This implementation invokes
|
|
386 |
* {@link #redirect(String, IRequestCycle, ApplicationRuntimeException)}to render the
|
|
387 |
* StaleSession page.
|
|
388 |
* <p>
|
|
389 |
* Subclasses may overide this method (without invoking this implementation). A common practice
|
|
390 |
* is to present an eror message on the application's Home page.
|
|
391 |
*
|
|
392 |
* @since 0.2.10
|
|
393 |
*/
|
|
394 |
|
|
395 | 3 |
protected void handleStaleSessionException(IRequestCycle cycle, StaleSessionException exception) |
396 |
throws IOException
|
|
397 |
{ |
|
398 | 3 |
redirect(getStaleSessionPageName(), cycle, exception); |
399 |
} |
|
400 |
|
|
401 |
/**
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|
402 |
* Changes the locale for the engine.
|
|
403 |
*/
|
|
404 |
|
|
405 | 67 |
public void setLocale(Locale value) |
406 |
{ |
|
407 | 67 |
Defense.notNull(value, "locale");
|
408 |
|
|
409 | 67 |
_locale = value; |
410 |
|
|
411 |
// The locale may be set before the engine is initialized with the Infrastructure.
|
|
412 |
|
|
413 | 67 |
if (_infrastructure != null) |
414 | 12 |
_infrastructure.setLocale(value); |
415 |
} |
|
416 |
|
|
417 |
/**
|
|
418 |
* @see Infrastructure#getClassResolver()
|
|
419 |
*/
|
|
420 |
|
|
421 | 64 |
public ClassResolver getClassResolver()
|
422 |
{ |
|
423 | 64 |
return _infrastructure.getClassResolver();
|
424 |
} |
|
425 |
|
|
426 |
/**
|
|
427 |
* Generates a description of the instance. Invokes {@link #extendDescription(ToStringBuilder)}
|
|
428 |
* to fill in details about the instance.
|
|
429 |
*
|
|
430 |
* @see #extendDescription(ToStringBuilder)
|
|
431 |
*/
|
|
432 |
|
|
433 | 0 |
public String toString()
|
434 |
{ |
|
435 | 0 |
ToStringBuilder builder = new ToStringBuilder(this); |
436 |
|
|
437 | 0 |
builder.append("locale", _locale);
|
438 |
|
|
439 | 0 |
return builder.toString();
|
440 |
} |
|
441 |
|
|
442 |
/**
|
|
443 |
* Implemented by subclasses to return the names of the active pages (pages for which recorders
|
|
444 |
* exist). May return the empty list, but should not return null.
|
|
445 |
*/
|
|
446 |
|
|
447 |
abstract public Collection getActivePageNames();
|
|
448 |
|
|
449 |
/**
|
|
450 |
* Gets the visit object from the
|
|
451 |
* {@link org.apache.tapestry.engine.state.ApplicationStateManager}, creating it if it does not
|
|
452 |
* already exist.
|
|
453 |
* <p>
|
|
454 |
* As of Tapestry 4.0, this will always create the visit object, possibly creating a new session
|
|
455 |
* in the process.
|
|
456 |
*/
|
|
457 |
|
|
458 | 3 |
public Object getVisit()
|
459 |
{ |
|
460 | 3 |
return _infrastructure.getApplicationStateManager().get("visit"); |
461 |
} |
|
462 |
|
|
463 | 0 |
public void setVisit(Object visit) |
464 |
{ |
|
465 | 0 |
_infrastructure.getApplicationStateManager().store("visit", visit);
|
466 |
} |
|
467 |
|
|
468 |
/**
|
|
469 |
* Gets the visit object from the
|
|
470 |
* {@link org.apache.tapestry.engine.state.ApplicationStateManager}, which will create it as
|
|
471 |
* necessary.
|
|
472 |
*/
|
|
473 |
|
|
474 | 2 |
public Object getVisit(IRequestCycle cycle)
|
475 |
{ |
|
476 | 2 |
return getVisit();
|
477 |
} |
|
478 |
|
|
479 | 0 |
public boolean getHasVisit() |
480 |
{ |
|
481 | 0 |
return _infrastructure.getApplicationStateManager().exists("visit"); |
482 |
} |
|
483 |
|
|
484 |
/**
|
|
485 |
* Returns the global object for the application. The global object is created at the start of
|
|
486 |
* the request ({@link #setupForRequest(RequestContext)}invokes
|
|
487 |
* {@link #createGlobal(RequestContext)}if needed), and is stored into the
|
|
488 |
* {@link ServletContext}. All instances of the engine for the application share the global
|
|
489 |
* object; however, the global object is explicitly <em>not</em> replicated to other servers
|
|
490 |
* within a cluster.
|
|
491 |
*
|
|
492 |
* @since 2.3
|
|
493 |
*/
|
|
494 |
|
|
495 | 1 |
public Object getGlobal()
|
496 |
{ |
|
497 | 1 |
return _infrastructure.getApplicationStateManager().get("global"); |
498 |
} |
|
499 |
|
|
500 | 5 |
public IScriptSource getScriptSource()
|
501 |
{ |
|
502 | 5 |
return _infrastructure.getScriptSource();
|
503 |
} |
|
504 |
|
|
505 |
/**
|
|
506 |
* Allows subclasses to include listener methods easily.
|
|
507 |
*
|
|
508 |
* @since 1.0.2
|
|
509 |
*/
|
|
510 |
|
|
511 | 0 |
public ListenerMap getListeners()
|
512 |
{ |
|
513 | 0 |
if (_listeners == null) |
514 | 0 |
_listeners = _infrastructure.getListenerMapSource().getListenerMapForObject(this);
|
515 |
|
|
516 | 0 |
return _listeners;
|
517 |
} |
|
518 |
|
|
519 |
/**
|
|
520 |
* Invoked when a {@link RedirectException}is thrown during the processing of a request.
|
|
521 |
*
|
|
522 |
* @throws ApplicationRuntimeException
|
|
523 |
* if an {@link IOException},{@link ServletException}is thrown by the redirect,
|
|
524 |
* or if no {@link RequestDispatcher}can be found for local resource.
|
|
525 |
* @since 2.2
|
|
526 |
*/
|
|
527 |
|
|
528 | 0 |
protected void handleRedirectException(IRequestCycle cycle, RedirectException ex) |
529 |
{ |
|
530 | 0 |
String location = ex.getRedirectLocation(); |
531 |
|
|
532 | 0 |
if (LOG.isDebugEnabled())
|
533 | 0 |
LOG.debug("Redirecting to: " + location);
|
534 |
|
|
535 | 0 |
_infrastructure.getRequest().forward(location); |
536 |
} |
|
537 |
|
|
538 |
/**
|
|
539 |
* @see Infrastructure#getDataSqueezer()
|
|
540 |
*/
|
|
541 |
|
|
542 | 0 |
public DataSqueezer getDataSqueezer()
|
543 |
{ |
|
544 | 0 |
return _infrastructure.getDataSqueezer();
|
545 |
} |
|
546 |
|
|
547 |
/** @since 2.3 */
|
|
548 |
|
|
549 | 0 |
public IPropertySource getPropertySource()
|
550 |
{ |
|
551 | 0 |
return _infrastructure.getApplicationPropertySource();
|
552 |
} |
|
553 |
|
|
554 |
/** @since 3.0 */
|
|
555 |
|
|
556 | 0 |
protected String getExceptionPageName()
|
557 |
{ |
|
558 | 0 |
return TapestryConstants.EXCEPTION_PAGE;
|
559 |
} |
|
560 |
|
|
561 |
/** @since 3.0 */
|
|
562 |
|
|
563 | 0 |
protected String getStaleLinkPageName()
|
564 |
{ |
|
565 | 0 |
return TapestryConstants.STALE_LINK_PAGE;
|
566 |
} |
|
567 |
|
|
568 |
/** @since 3.0 */
|
|
569 |
|
|
570 | 0 |
protected String getStaleSessionPageName()
|
571 |
{ |
|
572 | 0 |
return TapestryConstants.STALE_SESSION_PAGE;
|
573 |
} |
|
574 |
|
|
575 |
/** @since 4.0 */
|
|
576 | 29 |
public Infrastructure getInfrastructure()
|
577 |
{ |
|
578 | 29 |
return _infrastructure;
|
579 |
} |
|
580 |
|
|
581 | 376 |
public String getOutputEncoding()
|
582 |
{ |
|
583 | 376 |
return _infrastructure.getOutputEncoding();
|
584 |
} |
|
585 |
} |
|