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* <td>struts.objectFactory * <td>singleton * <td>Creates actions, results, and interceptors * </tr> * <tr> * <td>com.opensymphony.xwork2.ActionProxyFactory * <td>struts.actionProxyFactory * <td>singleton * <td>Creates the ActionProxy * </tr> * <tr> * <td>com.opensymphony.xwork2.util.ObjectTypeDeterminer * <td>struts.objectTypeDeterminer * <td>singleton * <td>Determines what the key and element class of a Map or Collection should be * </tr> * <tr> * <td>org.apache.struts2.dispatcher.mapper.ActionMapper * <td>struts.mapper.class * <td>singleton * <td>Determines the ActionMapping from a request and a URI from an ActionMapping * </tr> * <tr> * <td>org.apache.struts2.dispatcher.multipart.MultiPartRequest * <td>struts.multipart.parser * <td>per request * <td>Parses a multipart request (file upload) * </tr> * <tr> * <td>org.apache.struts2.views.freemarker.FreemarkerManager * <td>struts.freemarker.manager.classname * <td>singleton * <td>Loads and processes Freemarker templates * </tr> * <tr> * <td>org.apache.struts2.views.velocity.VelocityManager * <td>struts.velocity.manager.classname * <td>singleton * <td>Loads and processes Velocity templates * </tr> * <tr> * <td>com.opensymphony.xwork2.validator.ActionValidatorManager * <td>struts.actionValidatorManager * <td>singleton * <td>Main interface for validation managers (regular and annotation based). Handles both the loading of * configuration and the actual validation (since 2.1)</td> * </tr> * <tr> * <td>com.opensymphony.xwork2.util.ValueStackFactory * <td>struts.valueStackFactory * <td>singleton * <td>Creates value stacks (since 2.1) * </tr> * <tr> * <td>com.opensymphony.xwork2.reflection.ReflectionProvider * <td>struts.reflectionProvider * <td>singleton * <td>Provides reflection services, key place to plug in a custom expression language (since 2.1) * </tr> * <tr> * <td>com.opensymphony.xwork2.reflection.ReflectionContextFactory * <td>struts.reflectionContextFactory * <td>singleton * <td>Creates reflection context maps used for reflection and expression language operations (since 2.1) * </tr> * <tr> * <td>com.opensymphony.xwork2.config.PackageProvider * <td>N/A * <td>singleton * <td>All beans registered as PackageProvider implementations will be automatically included in configuration building (since 2.1) * </tr> * <tr> * <td>com.opensymphony.xwork2.util.PatternMatcher * <td>struts.patternMatcher * <td>singleton * <td>Matches patterns, such as action names, generally used in configuration (since 2.1) * </tr> * <tr> * <td>org.apache.struts2.views.dispatcher.DefaultStaticContentLoader * <td>struts.staticContentLoader * <td>singleton * <td>Loads static resources (since 2.1) * </tr> * </table> * * <!-- END SNIPPET: extensionPoints --> * </p> * <p> * Implementations are selected using the value of its associated property. That property is * used to determine the implementation by: * </p> * <ol> * <li>Trying to find an existing bean by that name in the container * <li>Trying to find a class by that name, then creating a new bean factory for it * <li>Creating a new delegation bean factory that delegates to the configured ObjectFactory at runtime * </ol> * <p> * Finally, this class overrides certain properties if dev mode is enabled: * </p> * <ul> * <li>struts.i18n.reload = true * <li>struts.configuration.xml.reload = true * </ul> */ public class BeanSelectionProvider implements ConfigurationProvider { public static final String DEFAULT_BEAN_NAME = "struts"; private static final Logger LOG = LoggerFactory.getLogger(BeanSelectionProvider.class); public void destroy() { // NO-OP } public void loadPackages() throws ConfigurationException { // NO-OP } public void init(Configuration configuration) throws ConfigurationException { // NO-OP } public boolean needsReload() { return false; } public void register(ContainerBuilder builder, LocatableProperties props) { alias(ObjectFactory.class, StrutsConstants.STRUTS_OBJECTFACTORY, builder, props); alias(XWorkConverter.class, StrutsConstants.STRUTS_XWORKCONVERTER, builder, props); alias(TextProvider.class, StrutsConstants.STRUTS_XWORKTEXTPROVIDER, builder, props, Scope.DEFAULT); alias(ActionProxyFactory.class, StrutsConstants.STRUTS_ACTIONPROXYFACTORY, builder, props); alias(ObjectTypeDeterminer.class, StrutsConstants.STRUTS_OBJECTTYPEDETERMINER, builder, props); alias(ActionMapper.class, StrutsConstants.STRUTS_MAPPER_CLASS, builder, props); alias(MultiPartRequest.class, StrutsConstants.STRUTS_MULTIPART_PARSER, builder, props, Scope.DEFAULT); alias(FreemarkerManager.class, StrutsConstants.STRUTS_FREEMARKER_MANAGER_CLASSNAME, builder, props); alias(VelocityManager.class, StrutsConstants.STRUTS_VELOCITY_MANAGER_CLASSNAME, builder, props); alias(UrlRenderer.class, StrutsConstants.STRUTS_URL_RENDERER, builder, props); alias(ActionValidatorManager.class, StrutsConstants.STRUTS_ACTIONVALIDATORMANAGER, builder, props); alias(ValueStackFactory.class, StrutsConstants.STRUTS_VALUESTACKFACTORY, builder, props); alias(ReflectionProvider.class, StrutsConstants.STRUTS_REFLECTIONPROVIDER, builder, props); alias(ReflectionContextFactory.class, StrutsConstants.STRUTS_REFLECTIONCONTEXTFACTORY, builder, props); alias(PatternMatcher.class, StrutsConstants.STRUTS_PATTERNMATCHER, builder, props); alias(StaticContentLoader.class, StrutsConstants.STRUTS_STATIC_CONTENT_LOADER, builder, props); alias(UnknownHandlerManager.class, StrutsConstants.STRUTS_UNKNOWN_HANDLER_MANAGER, builder, props); if ("true".equalsIgnoreCase(props.getProperty(StrutsConstants.STRUTS_DEVMODE))) { props.setProperty(StrutsConstants.STRUTS_I18N_RELOAD, "true"); props.setProperty(StrutsConstants.STRUTS_CONFIGURATION_XML_RELOAD, "true"); props.setProperty(StrutsConstants.STRUTS_FREEMARKER_TEMPLATES_CACHE, "false"); props.setProperty(StrutsConstants.STRUTS_FREEMARKER_TEMPLATES_CACHE_UPDATE_DELAY, "0"); // Convert struts properties into ones that xwork expects props.setProperty("devMode", "true"); } else { props.setProperty("devMode", "false"); } if (props.containsKey(StrutsConstants.STRUTS_LOG_MISSING_PROPERTIES)) props.setProperty("logMissingProperties", props.getProperty(StrutsConstants.STRUTS_LOG_MISSING_PROPERTIES)); if (props.containsKey(StrutsConstants.STRUTS_ENABLE_OGNL_EXPRESSION_CACHE)) props.setProperty("enableOGNLExpressionCache", props.getProperty(StrutsConstants.STRUTS_ENABLE_OGNL_EXPRESSION_CACHE)); String val = props.getProperty(StrutsConstants.STRUTS_ALLOW_STATIC_METHOD_ACCESS); if (val != null) { props.setProperty("allowStaticMethodAccess", val); } // TODO: This should be moved to XWork after 2.0.4 // struts.custom.i18n.resources LocalizedTextUtil.addDefaultResourceBundle("org/apache/struts2/struts-messages"); String bundles = props.getProperty(StrutsConstants.STRUTS_CUSTOM_I18N_RESOURCES); if (bundles != null && bundles.length() > 0) { StringTokenizer customBundles = new StringTokenizer(props.getProperty(StrutsConstants.STRUTS_CUSTOM_I18N_RESOURCES), ", "); while (customBundles.hasMoreTokens()) { String name = customBundles.nextToken(); try { LOG.info("Loading global messages from " + name); LocalizedTextUtil.addDefaultResourceBundle(name); } catch (Exception e) { LOG.error("Could not find messages file " + name + ".properties. Skipping"); } } } } void alias(Class type, String key, ContainerBuilder builder, Properties props) { alias(type, key, builder, props, Scope.SINGLETON); } void alias(Class type, String key, ContainerBuilder builder, Properties props, Scope scope) { if (!builder.contains(type)) { String foundName = props.getProperty(key, DEFAULT_BEAN_NAME); if (builder.contains(type, foundName)) { if (LOG.isDebugEnabled()) { LOG.info("Choosing bean ("+foundName+") for "+type); } builder.alias(type, foundName, Container.DEFAULT_NAME); } else { try { Class cls = ClassLoaderUtil.loadClass(foundName, this.getClass()); if (LOG.isDebugEnabled()) { LOG.debug("Choosing bean ("+cls+") for "+type); } builder.factory(type, cls, scope); } catch (ClassNotFoundException ex) { // Perhaps a spring bean id, so we'll delegate to the object factory at runtime if (LOG.isDebugEnabled()) { LOG.debug("Choosing bean ("+foundName+") for "+type+" to be loaded from the ObjectFactory"); } if (DEFAULT_BEAN_NAME.equals(foundName)) { // Probably an optional bean, will ignore } else { if (ObjectFactory.class != type) { builder.factory(type, new ObjectFactoryDelegateFactory(foundName, type), scope); } else { throw new ConfigurationException("Cannot locate the chosen ObjectFactory implementation: "+foundName); } } } } } else { LOG.warn("Unable to alias bean type "+type+", default mapping already assigned."); } } static class ObjectFactoryDelegateFactory implements Factory { String name; Class type; ObjectFactoryDelegateFactory(String name, Class type) { this.name = name; this.type = type; } public Object create(Context context) throws Exception { ObjectFactory objFactory = context.getContainer().getInstance(ObjectFactory.class); try { return objFactory.buildBean(name, null, true); } catch (ClassNotFoundException ex) { throw new ConfigurationException("Unable to load bean "+type.getName()+" ("+name+")"); } } } }

Other Struts examples (source code examples)

Here is a short list of links related to this Struts BeanSelectionProvider.java source code file:

Struts example source code file (BeanSelectionProvider.java)

This example Struts source code file (BeanSelectionProvider.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

choosing, choosing, class, classnotfoundexception, configurationexception, configurationexception, containerbuilder, objectfactory, objectfactory, objectfactorydelegatefactory, properties, string, string, unable, util

The Struts BeanSelectionProvider.java source code

/*
 * $Id: BeanSelectionProvider.java 965050 2010-07-17 10:10:46Z lukaszlenart $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.struts2.config;

import java.util.Properties;
import java.util.StringTokenizer;

import org.apache.struts2.StrutsConstants;
import org.apache.struts2.components.UrlRenderer;
import org.apache.struts2.dispatcher.StaticContentLoader;
import org.apache.struts2.dispatcher.mapper.ActionMapper;
import org.apache.struts2.dispatcher.multipart.MultiPartRequest;
import org.apache.struts2.views.freemarker.FreemarkerManager;
import org.apache.struts2.views.velocity.VelocityManager;

import com.opensymphony.xwork2.ActionProxyFactory;
import com.opensymphony.xwork2.ObjectFactory;
import com.opensymphony.xwork2.TextProvider;
import com.opensymphony.xwork2.UnknownHandlerManager;
import com.opensymphony.xwork2.config.Configuration;
import com.opensymphony.xwork2.config.ConfigurationException;
import com.opensymphony.xwork2.config.ConfigurationProvider;
import com.opensymphony.xwork2.conversion.ObjectTypeDeterminer;
import com.opensymphony.xwork2.conversion.impl.XWorkConverter;
import com.opensymphony.xwork2.inject.Container;
import com.opensymphony.xwork2.inject.ContainerBuilder;
import com.opensymphony.xwork2.inject.Context;
import com.opensymphony.xwork2.inject.Factory;
import com.opensymphony.xwork2.inject.Scope;
import com.opensymphony.xwork2.util.*;
import com.opensymphony.xwork2.util.location.LocatableProperties;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import com.opensymphony.xwork2.util.reflection.ReflectionContextFactory;
import com.opensymphony.xwork2.util.reflection.ReflectionProvider;
import com.opensymphony.xwork2.validator.ActionValidatorManager;

/**
 * Selects the implementations of key framework extension points, using the loaded
 * property constants.  The implementations are selected from the container builder
 * using the name defined in its associated property.  The default implementation name will
 * always be "struts".
 *
 * <p>
 * The following is a list of the allowed extension points:
 *
 * <!-- START SNIPPET: extensionPoints -->
 * <table border="1">
 *   <tr>
 *     <th>Type
 *     <th>Property
 *     <th>Scope
 *     <th>Description
 *   </tr>
 *   <tr>
 *     <td>com.opensymphony.xwork2.ObjectFactory
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