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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@128607 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
870 lines
23 KiB
Java
870 lines
23 KiB
Java
/*
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* #%L
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* Alfresco Remote API
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* %%
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* Copyright (C) 2005 - 2016 Alfresco Software Limited
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* %%
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* This file is part of the Alfresco software.
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* If the software was purchased under a paid Alfresco license, the terms of
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* the paid license agreement will prevail. Otherwise, the software is
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* provided under the following open source license terms:
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
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* #L%
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*/
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package org.alfresco.repo.web.scripts;
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import java.io.IOException;
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import java.io.Writer;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.ResourceBundle;
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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.dom4j.Element;
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import org.springframework.extensions.config.ConfigImpl;
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import org.springframework.extensions.config.ConfigSection;
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import org.springframework.extensions.config.ConfigService;
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import org.springframework.extensions.config.evaluator.Evaluator;
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import org.springframework.extensions.config.xml.XMLConfigService;
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import org.springframework.extensions.config.xml.elementreader.ConfigElementReader;
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import org.springframework.extensions.surf.extensibility.BasicExtensionModule;
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import org.springframework.extensions.surf.extensibility.ExtensibilityModel;
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import org.springframework.extensions.surf.extensibility.HandlesExtensibility;
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import org.springframework.extensions.surf.extensibility.WebScriptExtensibilityModuleHandler;
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import org.springframework.extensions.surf.extensibility.impl.ExtensibilityModelImpl;
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import org.springframework.extensions.surf.extensibility.impl.MarkupDirective;
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import org.springframework.extensions.webscripts.Authenticator;
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import org.springframework.extensions.webscripts.ExtendedScriptConfigModel;
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import org.springframework.extensions.webscripts.ExtendedTemplateConfigModel;
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import org.springframework.extensions.webscripts.ScriptConfigModel;
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import org.springframework.extensions.webscripts.TemplateConfigModel;
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import org.springframework.extensions.webscripts.WebScriptPropertyResourceBundle;
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import org.springframework.extensions.webscripts.WebScriptRequest;
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import org.springframework.extensions.webscripts.WebScriptResponse;
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/**
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* <p>A simple extensibility {@link org.springframework.extensions.webscripts.Container} for processing WebScripts. This extends the {@link RepositoryContainer} and
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* implements the {@link HandlesExtensibility} interface to provide extensibility capabilities.</p>
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*
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* @author David Draper
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*/
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public class ExtensibilityContainer extends RepositoryContainer implements HandlesExtensibility
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{
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private static final Log logger = LogFactory.getLog(ExtensibilityContainer.class);
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public boolean isExtensibilitySuppressed()
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{
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return false;
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}
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/**
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* <p>Opens a new {@link ExtensibilityModel}, defers execution to the extended {@link RepositoryContainer} and
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* then closes the {@link ExtensibilityModel}.</p>
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*/
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@Override
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public void executeScript(WebScriptRequest scriptReq,
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WebScriptResponse scriptRes,
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Authenticator auth) throws IOException
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{
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ExtensibilityModel extModel = this.openExtensibilityModel();
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try
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{
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super.executeScript(scriptReq, scriptRes, auth);
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}
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finally
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{
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// It's only necessary to close the model if it's actually been used. Not all WebScripts will make use of the
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// model. An example of this would be the StreamContent WebScript. It is important not to attempt to close
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// an unused model since the WebScript executed may have already flushed the response if it has overridden
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// the default .execute() method.
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if (this.modelUsed.get())
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{
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try
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{
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this.closeExtensibilityModel(extModel, scriptRes.getWriter());
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}
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catch (IOException e)
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{
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logger.error("An error occurred getting the Writer when closing an ExtensibilityModel", e);
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}
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}
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}
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}
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/**
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* <p>This keeps track of whether or not the {@link ExtensibilityModel} for the current thread has been used. The
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* thread local value will only be set to <code>true</code> if the <code>getCurrentExtensibilityModel</code> method
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* is called.</p>
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*/
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private ThreadLocal<Boolean> modelUsed = new ThreadLocal<Boolean>();
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/**
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* <p>A {@link WebScriptExtensibilityModuleHandler} is required for retrieving information on what
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* {@link BasicExtensionModule} instances have been configured and the extension files that need
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* to be processed. This variable should be set thorugh the Spring application context configuration.</p>
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*/
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private WebScriptExtensibilityModuleHandler extensibilityModuleHandler = null;
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/**
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* <p>Sets the {@link WebScriptExtensibilityModuleHandler} for this {@link org.springframework.extensions.webscripts.Container}.</p>
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* @param extensibilityModuleHandler WebScriptExtensibilityModuleHandler
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*/
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public void setExtensibilityModuleHandler(WebScriptExtensibilityModuleHandler extensibilityModuleHandler)
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{
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this.extensibilityModuleHandler = extensibilityModuleHandler;
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}
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/**
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* <p>Maintains a list of all the {@link ExtensibilityModel} instances being used across all the
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* available threads.</p>
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*/
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private ThreadLocal<ExtensibilityModel> extensibilityModel = new ThreadLocal<ExtensibilityModel>();
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/**
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* <p>Creates a new {@link ExtensibilityModel} and sets it on the current thread</p>
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*/
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public ExtensibilityModel openExtensibilityModel()
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{
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if (logger.isDebugEnabled())
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{
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logger.debug("Opening for thread: " + Thread.currentThread().getName());
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}
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this.extendedBundleCache.set(new HashMap<String, WebScriptPropertyResourceBundle>());
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this.evaluatedModules.set(null);
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this.fileBeingProcessed.set(null);
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this.globalConfig.set(null);
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this.sections.set(null);
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this.sectionsByArea.set(null);
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ExtensibilityModel model = new ExtensibilityModelImpl(null, this);
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this.extensibilityModel.set(model);
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this.modelUsed.set(Boolean.FALSE);
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return model;
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}
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/**
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* <p>Flushes the {@link ExtensibilityModel} provided and sets its parent as the current {@link ExtensibilityModel}
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* for the current thread.</p>
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*/
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public void closeExtensibilityModel(ExtensibilityModel model, Writer out)
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{
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if (logger.isDebugEnabled())
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{
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logger.debug("Closing for thread: " + Thread.currentThread().getName());
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}
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model.flushModel(out);
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this.modelUsed.set(Boolean.FALSE);
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this.extensibilityModel.set(null);
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}
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/**
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* <p>Returns the {@link ExtensibilityModel} for the current thread.</p>
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*/
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public ExtensibilityModel getCurrentExtensibilityModel()
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{
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if (logger.isDebugEnabled())
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{
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logger.debug("Getting current for thread: " + Thread.currentThread().getName());
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}
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this.modelUsed.set(Boolean.TRUE);
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return this.extensibilityModel.get();
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}
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/**
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* <p>This method is implemented to perform no action as it is not necessary for a standalone WebScript
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* container to add dependencies for processing.</p>
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*/
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public void updateExtendingModuleDependencies(String pathBeingProcessed, Map<String, Object> model)
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{
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// NOT REQUIRED FOR STANDALONE WEBSCRIPT CONTAINER
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}
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/**
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* <p>A thread-safe cache of extended {@link ResourceBundle} instances for the current request.</p>
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*/
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private ThreadLocal<Map<String, WebScriptPropertyResourceBundle>> extendedBundleCache = new ThreadLocal<Map<String, WebScriptPropertyResourceBundle>>();
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/**
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* <p>Checks the cache to see if it has cached an extended bundle (that is a basic {@link ResourceBundle} that
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* has had extension modules applied to it. Extended bundles can only be safely cached once per request as the modules
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* applied can vary for each request.</p>
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*
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* @param webScriptId The id of the WebScript to retrieve the extended bundle for.
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* @return A cached bundle or <code>null</code> if the bundle has not previously been cached.
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*/
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public ResourceBundle getCachedExtendedBundle(String webScriptId)
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{
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ResourceBundle cachedExtendedBundle = null;
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Map<String, WebScriptPropertyResourceBundle> threadLocal = this.extendedBundleCache.get();
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if (threadLocal != null)
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{
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cachedExtendedBundle = this.extendedBundleCache.get().get(webScriptId);
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}
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return cachedExtendedBundle;
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}
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/**
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* <p>Adds a new extended bundle to the cache. An extended bundle is a WebScript {@link ResourceBundle} that has had
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* {@link ResourceBundle} instances merged into it from extension modules that have been applied. These can only be cached
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* for the lifetime of the request as different modules may be applied to the same WebScript for different requests.</p>
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*
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* @param webScriptId The id of the WebScript to cache the extended bundle against.
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* @param extensionBundle The extended bundle to cache.
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*/
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public void addExtensionBundleToCache(String webScriptId, WebScriptPropertyResourceBundle extensionBundle)
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{
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Map<String, WebScriptPropertyResourceBundle> threadLocal = this.extendedBundleCache.get();
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if (threadLocal == null)
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{
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// This should never be the case because when a new model is opened this value should be reset
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// but we will double-check to avoid the potential of NPEs...
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threadLocal = new HashMap<String, WebScriptPropertyResourceBundle>();
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this.extendedBundleCache.set(threadLocal);
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}
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threadLocal.put(webScriptId, extensionBundle);
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}
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/**
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* <p>A {@link ThreadLocal} reference to the file currently being processed in the model.</p>
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*/
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private ThreadLocal<String> fileBeingProcessed = new ThreadLocal<String>();
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/**
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* <p>Returns the path of the file currently being processed in the model by the current thread.
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* This information is primarily provided for the purposes of generating debug information.</p>
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*
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* @return The path of the file currently being processed.
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*/
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public String getFileBeingProcessed()
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{
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return this.fileBeingProcessed.get();
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}
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/**
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* <p>Sets the path of the file currently being processed in the model by the current thread.
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* This information should be collected to assist with providing debug information.</p>
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* @param file The path of the file currently being processed.
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*/
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public void setFileBeingProcessed(String file)
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{
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this.fileBeingProcessed.set(file);
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}
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/**
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* <p>Retrieves an files for the evaluated modules that are extending the WebScript files being processed.</p>
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*/
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public List<String> getExtendingModuleFiles(String pathBeingProcessed)
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{
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List<String> extendingModuleFiles = new ArrayList<String>();
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for (BasicExtensionModule module: this.getEvaluatedModules())
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{
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extendingModuleFiles.addAll(this.extensibilityModuleHandler.getExtendingModuleFiles(module, pathBeingProcessed));
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}
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return extendingModuleFiles;
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}
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/**
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* <p>The list of {@link org.springframework.extensions.surf.types.ExtensionModule} instances that have been evaluated as applicable to
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* this RequestContext. This is set to <code>null</code> when during instantiation and is only
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* properly set the first time the <code>getEvaluatedModules</code> method is invoked. This ensures
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* that module evaluation only occurs once per request.</p>
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*/
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private ThreadLocal<List<BasicExtensionModule>> evaluatedModules = new ThreadLocal<List<BasicExtensionModule>>();
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/**
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* <p>Retrieve the list of {@link org.springframework.extensions.surf.types.ExtensionModule} instances that have been evaluated as applicable
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* for the current request. If this list has not yet been populated then use the {@link org.springframework.extensions.surf.extensibility.ExtensibilityModuleHandler}
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* configured in the Spring application context to evaluate them.</p>
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*
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* @return A list of {@link org.springframework.extensions.surf.types.ExtensionModule} instances that are applicable to the current request.
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*/
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public List<BasicExtensionModule> getEvaluatedModules()
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{
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List<BasicExtensionModule> evaluatedModules = this.evaluatedModules.get();
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if (evaluatedModules == null)
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{
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if (this.extensibilityModuleHandler == null)
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{
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if (logger.isErrorEnabled())
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{
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logger.error("No 'extensibilityModuleHandler' has been configured for this request context. Extensions cannot be processed");
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}
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evaluatedModules = new ArrayList<BasicExtensionModule>();
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this.evaluatedModules.set(evaluatedModules);
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}
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else
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{
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evaluatedModules = this.extensibilityModuleHandler.getExtensionModules();
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this.evaluatedModules.set(evaluatedModules);
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}
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}
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return evaluatedModules;
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}
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/**
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* <p>This is a local {@link ConfigImpl} instance that will only be used when extension modules are employed. It will
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* initially be populated with the default "static" global configuration taken from the {@link ConfigService} associated
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* with this {@link org.springframework.extensions.surf.RequestContext} but then updated to include global configuration provided by extension modules that
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* have been evaluated to be applied to the current request.</p>
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*/
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private ThreadLocal<ConfigImpl> globalConfig = new ThreadLocal<ConfigImpl>();
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/**
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* <p>This map represents {@link ConfigSection} instances mapped by area. It will only be used when extension modules are
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* employed. It will initially be populated with the default "static" configuration taken from the {@link ConfigService} associated
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* with this {@link org.springframework.extensions.surf.RequestContext} but then updated to include configuration provided by extension modules that have been evaluated
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* to be applied to the current request.</p>
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*/
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private ThreadLocal<Map<String, List<ConfigSection>>> sectionsByArea = new ThreadLocal<Map<String,List<ConfigSection>>>();
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/**
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* <p>A list of {@link ConfigSection} instances that are only applicable to the current request. It will only be used when extension modules are
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* employed. It will initially be populated with the default "static" configuration taken from the {@link ConfigService} associated
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* with this {@link org.springframework.extensions.surf.RequestContext} but then updated to include configuration provided by extension modules that have been evaluated
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* to be applied to the current request.</p>
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*/
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private ThreadLocal<List<ConfigSection>> sections = new ThreadLocal<List<ConfigSection>>();
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/**
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* <p>Creates a new {@link ExtendedScriptConfigModel} instance using the local configuration generated for this request.
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* If configuration for the request will be generated if it does not yet exist. It is likely that this method will be
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* called multiple times within the context of a single request and although the configuration containers will always
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* be the same a new {@link ExtendedScriptConfigModel} instance will always be created as the the supplied <code>xmlConfig</code>
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* string could be different for each call (because each WebScript invoked in the request will supply different
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* configuration.</p>
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*/
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public ScriptConfigModel getExtendedScriptConfigModel(String xmlConfig)
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{
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if (this.globalConfig.get() == null && this.sectionsByArea.get() == null && this.sections.get() == null)
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{
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this.getConfigExtensions();
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}
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return new ExtendedScriptConfigModel(getConfigService(), xmlConfig, this.globalConfig.get(), this.sectionsByArea.get(), this.sections.get());
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}
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/**
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* <p>Creates a new {@link TemplateConfigModel} instance using the local configuration generated for this request.
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* If configuration for the request will be generated if it does not yet exist. It is likely that this method will be
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* called multiple times within the context of a single request and although the configuration containers will always
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* be the same a new {@link TemplateConfigModel} instance will always be created as the the supplied <code>xmlConfig</code>
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* string could be different for each call (because each WebScript invoked in the request will supply different
|
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* configuration.</p>
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*/
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public TemplateConfigModel getExtendedTemplateConfigModel(String xmlConfig)
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|
{
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if (this.globalConfig.get() == null && this.sectionsByArea.get() == null && this.sections.get() == null)
|
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|
{
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|
this.getConfigExtensions();
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}
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return new ExtendedTemplateConfigModel(getConfigService(), xmlConfig, this.globalConfig.get(), this.sectionsByArea.get(), this.sections.get());
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}
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/**
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* <p>Creates and populates the request specific configuration container objects (<code>globalConfig</code>, <code>sectionsByArea</code> &
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* <code>sections</code> with a combination of the default static configuration (taken from files accessed by the {@link ConfigService}) and
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* dynamic configuration taken from extension modules evaluated for the current request. </p>
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*/
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|
|
private void getConfigExtensions()
|
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|
|
{
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|
// Extended configuration is only possible if config service is an XMLConfigService...
|
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|
//
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|
// ...also, it's only necessary to populate the configuration containers if they have not already been populated. This test should also
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// be carried out by the two methods ("getExtendedTemplateConfigModel" & "getExtendedTemplateConfigModel") to prevent duplication
|
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|
// of effort... but in case other methods attempt to access it we will make these additional tests.
|
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|
if (getConfigService() instanceof XMLConfigService && this.globalConfig == null && this.sectionsByArea == null && this.sections == null)
|
|
|
|
{
|
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|
|
// Cast the config service for ease of access
|
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|
|
XMLConfigService xmlConfigService = (XMLConfigService) getConfigService();
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|
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|
|
// Get the current configuration from the ConfigService - we don't want to permanently pollute
|
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|
|
// the standard configuration with additions from the modules...
|
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|
|
this.globalConfig.set(new ConfigImpl((ConfigImpl)xmlConfigService.getGlobalConfig())); // Make a copy of the current global config
|
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|
|
|
|
|
|
// Initialise these with the config service values...
|
|
|
|
this.sectionsByArea.set(new HashMap<String, List<ConfigSection>>(xmlConfigService.getSectionsByArea()));
|
|
|
|
this.sections.set(new ArrayList<ConfigSection>(xmlConfigService.getSections()));
|
|
|
|
|
|
|
|
// Check to see if there are any modules that we need to apply...
|
|
|
|
List<BasicExtensionModule> evaluatedModules = this.getEvaluatedModules();
|
|
|
|
if (evaluatedModules != null && !evaluatedModules.isEmpty())
|
|
|
|
{
|
|
|
|
for (BasicExtensionModule currModule: evaluatedModules)
|
|
|
|
{
|
|
|
|
for (Element currentConfigElement: currModule.getConfigurations())
|
|
|
|
{
|
|
|
|
// Set up containers for our request specific configuration - this will contain data taken from the evaluated modules...
|
|
|
|
Map<String, ConfigElementReader> parsedElementReaders = new HashMap<String, ConfigElementReader>();
|
|
|
|
Map<String, Evaluator> parsedEvaluators = new HashMap<String, Evaluator>();
|
|
|
|
List<ConfigSection> parsedConfigSections = new ArrayList<ConfigSection>();
|
|
|
|
|
|
|
|
// Parse and process the parses configuration...
|
|
|
|
String currentArea = xmlConfigService.parseFragment(currentConfigElement, parsedElementReaders, parsedEvaluators, parsedConfigSections);
|
|
|
|
for (Map.Entry<String, Evaluator> entry : parsedEvaluators.entrySet())
|
|
|
|
{
|
|
|
|
// add the evaluators to the config service
|
|
|
|
parsedEvaluators.put(entry.getKey(), entry.getValue());
|
|
|
|
}
|
|
|
|
for (Map.Entry<String, ConfigElementReader> entry : parsedElementReaders.entrySet())
|
|
|
|
{
|
|
|
|
// add the element readers to the config service
|
|
|
|
parsedElementReaders.put(entry.getKey(), entry.getValue());
|
|
|
|
}
|
|
|
|
for (ConfigSection section : parsedConfigSections)
|
|
|
|
{
|
|
|
|
// Update local configuration with our updated data...
|
|
|
|
xmlConfigService.addConfigSection(section, currentArea, this.globalConfig.get(), this.sectionsByArea.get(), this.sections.get());
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* <p>Adds the <{@code}@markup> directive to the container which allows FreeMarker templates to be extended.</p>
|
|
|
|
*/
|
|
|
|
public void addExtensibilityDirectives(Map<String, Object> freeMarkerModel, ExtensibilityModel extModel)
|
|
|
|
{
|
|
|
|
MarkupDirective mud = new MarkupDirective("markup", extModel);
|
|
|
|
freeMarkerModel.put("markup", mud);
|
|
|
|
}
|
|
|
|
}
|
|
|