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/*
* $Id: ReloadableDefinitionsFactory.java 471754 2006-11-06 14:55:09Z husted $
*
* 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.struts.tiles.definition;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.tiles.ComponentDefinition;
import org.apache.struts.tiles.ComponentDefinitionsFactory;
import org.apache.struts.tiles.DefinitionsFactoryException;
import org.apache.struts.tiles.FactoryNotFoundException;
import org.apache.struts.tiles.xmlDefinition.I18nFactorySet;
import org.apache.struts.util.RequestUtils;
/**
* A reloadable factory.
* This factory is the main entrance to any factory implementation. It takes in
* charge real implementation instance, and allows reloading by creating a new
* instance.
*
* @since Struts 1.1
* @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
*/
public class ReloadableDefinitionsFactory implements ComponentDefinitionsFactory {
/**
* The real factory instance.
*/
protected ComponentDefinitionsFactory factory = null;
/**
* Initialization parameters.
*/
protected Map properties = null;
/**
* Name of init property carrying factory class name.
*/
public static final String DEFINITIONS_FACTORY_CLASSNAME =
"definitions-factory-class";
/**
* Constructor.
* Create a factory according to servlet settings.
* @param servletContext Our servlet context.
* @param servletConfig Our servlet config.
* @throws DefinitionsFactoryException If factory creation fail.
*/
public ReloadableDefinitionsFactory(
ServletContext servletContext,
ServletConfig servletConfig)
throws DefinitionsFactoryException {
properties = new ServletPropertiesMap(servletConfig);
factory = createFactory(servletContext, properties);
}
/**
* Constructor.
* Create a factory according to servlet settings.
* @param servletContext Our servlet context.
* @param properties Map containing all properties.
* @throws DefinitionsFactoryException If factory creation fail.
*/
public ReloadableDefinitionsFactory(
ServletContext servletContext,
Map properties)
throws DefinitionsFactoryException {
this.properties = properties;
factory = createFactory(servletContext, properties);
}
/**
* Create Definition factory from provided classname.
* If a factory class name is provided, a factory of this class is created. Otherwise,
* a default factory is created.
* Factory must have a constructor taking ServletContext and Map as parameter.
* @param classname Class name of the factory to create.
* @param servletContext Servlet Context passed to newly created factory.
* @param properties Map of name/property passed to newly created factory.
* @return newly created factory.
* @throws DefinitionsFactoryException If an error occur while initializing factory
*/
public ComponentDefinitionsFactory createFactoryFromClassname(
ServletContext servletContext,
Map properties,
String classname)
throws DefinitionsFactoryException {
if (classname == null) {
return createFactory(servletContext, properties);
}
// Try to create from classname
try {
Class factoryClass = RequestUtils.applicationClass(classname);
ComponentDefinitionsFactory factory =
(ComponentDefinitionsFactory) factoryClass.newInstance();
factory.initFactory(servletContext, properties);
return factory;
} catch (ClassCastException ex) { // Bad classname
throw new DefinitionsFactoryException(
"Error - createDefinitionsFactory : Factory class '"
+ classname
+ " must implements 'ComponentDefinitionsFactory'.",
ex);
} catch (ClassNotFoundException ex) { // Bad classname
throw new DefinitionsFactoryException(
"Error - createDefinitionsFactory : Bad class name '"
+ classname
+ "'.",
ex);
} catch (InstantiationException ex) { // Bad constructor or error
throw new DefinitionsFactoryException(ex);
} catch (IllegalAccessException ex) {
throw new DefinitionsFactoryException(ex);
}
}
/**
* Create default Definition factory.
* Factory must have a constructor taking ServletContext and Map as parameter.
* In this implementation, default factory is of class I18nFactorySet
* @param servletContext Servlet Context passed to newly created factory.
* @param properties Map of name/property passed to newly created factory.
* @return newly created factory.
* @throws DefinitionsFactoryException If an error occur while initializing factory
*/
public ComponentDefinitionsFactory createDefaultFactory(
ServletContext servletContext,
Map properties)
throws DefinitionsFactoryException {
ComponentDefinitionsFactory factory =
new I18nFactorySet(servletContext, properties);
return factory;
}
/**
* Create Definition factory.
* Convenience method. ServletConfig is wrapped into a Map allowing retrieval
* of init parameters. Factory classname is also retrieved, as well as debug level.
* Finally, approriate createDefinitionsFactory() is called.
* @param servletContext Servlet Context passed to newly created factory.
* @param properties Map containing all properties.
*/
public ComponentDefinitionsFactory createFactory(
ServletContext servletContext,
Map properties)
throws DefinitionsFactoryException {
String classname = (String) properties.get(DEFINITIONS_FACTORY_CLASSNAME);
if (classname != null) {
return createFactoryFromClassname(servletContext, properties, classname);
}
return new I18nFactorySet(servletContext, properties);
}
/**
* Get a definition by its name.
* Call appropriate method on underlying factory instance.
* Throw appropriate exception if definition or definition factory is not found.
* @param definitionName Name of requested definition.
* @param request Current servlet request.
* @param servletContext Current servlet context.
* @throws FactoryNotFoundException Can't find definition factory.
* @throws DefinitionsFactoryException General error in factory while getting definition.
*/
public ComponentDefinition getDefinition(
String definitionName,
ServletRequest request,
ServletContext servletContext)
throws FactoryNotFoundException, DefinitionsFactoryException {
return factory.getDefinition(
definitionName,
(HttpServletRequest) request,
servletContext);
}
/**
* Reload underlying factory.
* Reload is done by creating a new factory instance, and replacing the old instance
* with the new one.
* @param servletContext Current servlet context.
* @throws DefinitionsFactoryException If factory creation fails.
*/
public void reload(ServletContext servletContext)
throws DefinitionsFactoryException {
ComponentDefinitionsFactory newInstance =
createFactory(servletContext, properties);
factory = newInstance;
}
/**
* Get underlying factory instance.
* @return ComponentDefinitionsFactory
*/
public ComponentDefinitionsFactory getFactory() {
return factory;
}
/**
* Init factory.
* This method is required by interface ComponentDefinitionsFactory. It is
* not used in this implementation, as it manages itself the underlying creation
* and initialization.
* @param servletContext Servlet Context passed to newly created factory.
* @param properties Map of name/property passed to newly created factory.
* Map can contain more properties than requested.
* @throws DefinitionsFactoryException An error occur during initialization.
*/
public void initFactory(ServletContext servletContext, Map properties)
throws DefinitionsFactoryException {
// do nothing
}
/**
* Return String representation.
* @return String representation.
*/
public String toString() {
return factory.toString();
}
/**
* Inner class.
* Wrapper for ServletContext init parameters.
* Object of this class is an HashMap containing parameters and values
* defined in the servlet config file (web.xml).
*/
class ServletPropertiesMap extends HashMap {
/**
* Constructor.
*/
ServletPropertiesMap(ServletConfig config) {
// This implementation is very simple.
// It is possible to avoid creation of a new structure, but this would
// imply writing all of the Map interface.
Enumeration e = config.getInitParameterNames();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
put(key, config.getInitParameter(key));
}
}
} // end inner class
}
