/*
* $Id: BeanSelectionProvider.java 789432 2009-06-29 20:15:24Z musachy $
*
* 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.DefaultStaticContentLoader;
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>
* <th>Property</th>
* <th>Scope</th>
* <th>Description</th>
* </tr>
* <tr>
* <td>com.opensymphony.xwork2.ObjectFactory</td>
* <td>struts.objectFactory</td>
* <td>singleton</td>
* <td>Creates actions, results, and interceptors</td>
* </tr>
* <tr>
* <td>com.opensymphony.xwork2.ActionProxyFactory</td>
* <td>struts.actionProxyFactory</td>
* <td>singleton</td>
* <td>Creates the ActionProxy</td>
* </tr>
* <tr>
* <td>com.opensymphony.xwork2.util.ObjectTypeDeterminer</td>
* <td>struts.objectTypeDeterminer</td>
* <td>singleton</td>
* <td>Determines what the key and element class of a Map or Collection should be</td>
* </tr>
* <tr>
* <td>org.apache.struts2.dispatcher.mapper.ActionMapper</td>
* <td>struts.mapper.class</td>
* <td>singleton</td>
* <td>Determines the ActionMapping from a request and a URI from an ActionMapping</td>
* </tr>
* <tr>
* <td>org.apache.struts2.dispatcher.multipart.MultiPartRequest</td>
* <td>struts.multipart.parser</td>
* <td>per request</td>
* <td>Parses a multipart request (file upload)</td>
* </tr>
* <tr>
* <td>org.apache.struts2.views.freemarker.FreemarkerManager</td>
* <td>struts.freemarker.manager.classname</td>
* <td>singleton</td>
* <td>Loads and processes Freemarker templates</td>
* </tr>
* <tr>
* <td>org.apache.struts2.views.velocity.VelocityManager</td>
* <td>struts.velocity.manager.classname</td>
* <td>singleton</td>
* <td>Loads and processes Velocity templates</td>
* </tr>
* <tr>
* <td>com.opensymphony.xwork2.validator.ActionValidatorManager</td>
* <td>struts.actionValidatorManager</td>
* <td>singleton</td>
* <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>
* <td>struts.valueStackFactory</td>
* <td>singleton</td>
* <td>Creates value stacks (since 2.1)</td>
* </tr>
* <tr>
* <td>com.opensymphony.xwork2.reflection.ReflectionProvider</td>
* <td>struts.reflectionProvider</td>
* <td>singleton</td>
* <td>Provides reflection services, key place to plug in a custom expression language (since 2.1)</td>
* </tr>
* <tr>
* <td>com.opensymphony.xwork2.reflection.ReflectionContextFactory</td>
* <td>struts.reflectionContextFactory</td>
* <td>singleton</td>
* <td>Creates reflection context maps used for reflection and expression language operations (since 2.1)</td>
* </tr>
* <tr>
* <td>com.opensymphony.xwork2.config.PackageProvider</td>
* <td>N/A</td>
* <td>singleton</td>
* <td>All beans registered as PackageProvider implementations will be automatically included in configuration building (since 2.1)</td>
* </tr>
* <tr>
* <td>com.opensymphony.xwork2.util.PatternMatcher</td>
* <td>struts.patternMatcher</td>
* <td>singleton</td>
* <td>Matches patterns, such as action names, generally used in configuration (since 2.1)</td>
* </tr>
* <tr>
* <td>org.apache.struts2.views.dispatcher.DefaultStaticContentLoader</td>
* <td>struts.staticContentLoader</td>
* <td>singleton</td>
* <td>Loads static resources (since 2.1)</td>
* </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>
* <li>Trying to find a class by that name, then creating a new bean factory for it</li>
* <li>Creating a new delegation bean factory that delegates to the configured ObjectFactory at runtime</li>
* </ol>
* <p>
* Finally, this class overrides certain properties if dev mode is enabled:
* </p>
* <ul>
* <li><code>struts.i18n.reload = true</code></li>
* <li><code>struts.configuration.xml.reload = true</code></li>
* </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");
// 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+")");
}
}
}
}
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