    001    // Copyright 2008, 2009 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    //     http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.internal.spring;
    016
    017    import org.apache.tapestry5.ioc.internal.util.InternalUtils;
    018    import org.apache.tapestry5.spring.ApplicationContextCustomizer;
    019    import org.apache.tapestry5.spring.TapestryApplicationContext;
    020    import org.springframework.context.ApplicationContextException;
    021    import org.springframework.web.context.ConfigurableWebApplicationContext;
    022    import org.springframework.web.context.ContextLoader;
    023
    024    import javax.servlet.ServletContext;
    025
    026    public class CustomizingContextLoader extends ContextLoader
    027    {
    028        private final ApplicationContextCustomizer customizer;
    029
    030        public CustomizingContextLoader(ApplicationContextCustomizer customizer)
    031        {
    032            this.customizer = customizer;
    033        }
    034
    035        @Override
    036        protected void customizeContext(ServletContext servletContext, ConfigurableWebApplicationContext applicationContext)
    037        {
    038            customizer.customizeApplicationContext(servletContext, applicationContext);
    039        }
    040
    041        @Override
    042        protected Class determineContextClass(ServletContext servletContext) throws ApplicationContextException
    043        {
    044            String contextClassName = servletContext.getInitParameter(CONTEXT_CLASS_PARAM);
    045
    046            if (InternalUtils.isNonBlank(contextClassName))
    047            {
    048                Class result = super.determineContextClass(servletContext);
    049
    050                if (!TapestryApplicationContext.class.isAssignableFrom(result))
    051                    throw new IllegalArgumentException(String.format(
    052                            "When using the Tapestry/Spring integration library, you must specifiy a context class that extends from %s. Class %s does not. Update the '%s' servlet context init parameter.",
    053                            TapestryApplicationContext.class.getName(),
    054                            result.getName(),
    055                            CONTEXT_CLASS_PARAM));
    056
    057                return result;
    058            }
    059
    060            return TapestryApplicationContext.class;
    061        }
    062    }