/*
* Copyright 2002-2009 the original author or authors.
*
* Licensed 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.springframework.web.servlet.view.tiles2;
import org.apache.tiles.TilesException;
import org.apache.tiles.context.TilesRequestContext;
import org.apache.tiles.preparer.PreparerFactory;
import org.apache.tiles.preparer.ViewPreparer;
import org.apache.tiles.servlet.context.ServletTilesRequestContext;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.springframework.web.servlet.DispatcherServlet;
/**
* Abstract implementation of the Tiles2 {@link org.apache.tiles.preparer.PreparerFactory}
* interface, obtaining the current Spring WebApplicationContext and delegating to
* {@link #getPreparer(String, org.springframework.web.context.WebApplicationContext)}.
*
* @author Juergen Hoeller
* @since 2.5
* @see #getPreparer(String, org.springframework.web.context.WebApplicationContext)
* @see SimpleSpringPreparerFactory
* @see SpringBeanPreparerFactory
*/
public abstract class AbstractSpringPreparerFactory implements PreparerFactory {
public ViewPreparer getPreparer(String name, TilesRequestContext context) throws TilesException {
WebApplicationContext webApplicationContext = (WebApplicationContext) context.getRequestScope().get(
DispatcherServlet.WEB_APPLICATION_CONTEXT_ATTRIBUTE);
if (webApplicationContext == null) {
webApplicationContext = (WebApplicationContext) context.getApplicationContext().getApplicationScope().get(
WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
if (webApplicationContext == null) {
throw new IllegalStateException("No WebApplicationContext found: no ContextLoaderListener registered?");
}
}
return getPreparer(name, webApplicationContext);
}
/**
* Obtain a preparer instance for the given preparer name,
* based on the given Spring WebApplicationContext.
* @param name the name of the preparer
* @param context the current Spring WebApplicationContext
* @return the preparer instance
* @throws TilesException in case of failure
*/
protected abstract ViewPreparer getPreparer(String name, WebApplicationContext context) throws TilesException;
}
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