org.springmodules.cache.config.CachingListenerValidatorImpl.java Source code

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Here is the source code for org.springmodules.cache.config.CachingListenerValidatorImpl.java

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/*
 * Created on Mar 31, 2006
 *
 * 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.
 *
 * Copyright @2006 the original author or authors.
 */
package org.springmodules.cache.config;

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.util.ClassUtils;

import org.springmodules.cache.interceptor.caching.CachingListener;

/**
 * <p>
 * Default implementation of <code>{@link CachingListenerValidator}</code>.
 * </p>
 *
 * @author Omar Irbouh
 * @author Alex Ruiz
 */
public class CachingListenerValidatorImpl implements CachingListenerValidator {

    /**
     * @see CachingListenerValidator#validate(Object, int, ParserContext)
     */
    public void validate(Object cachingListener, int index, ParserContext parserContext)
            throws IllegalStateException {
        BeanDefinitionRegistry registry = parserContext.getRegistry();
        BeanDefinition beanDefinition = null;

        if (cachingListener instanceof RuntimeBeanReference) {
            String beanName = ((RuntimeBeanReference) cachingListener).getBeanName();
            beanDefinition = registry.getBeanDefinition(beanName);

        } else if (cachingListener instanceof BeanDefinitionHolder) {
            beanDefinition = ((BeanDefinitionHolder) cachingListener).getBeanDefinition();
        } else {
            throw new IllegalStateException("The caching listener reference/holder [" + index
                    + "] should be an instance of <" + RuntimeBeanReference.class.getName() + "> or <"
                    + BeanDefinitionHolder.class.getName() + ">");
        }

        Class expectedClass = CachingListener.class;
        Class actualClass = resolveBeanClass(beanDefinition);

        if (!expectedClass.isAssignableFrom(actualClass)) {
            throw new IllegalStateException("The caching listener [" + index + "] should be an instance of <"
                    + expectedClass.getName() + ">");
        }
    }

    /**
     * Resolves class of a beanDefinition
     * @param beanDefinition the bean definition
     * @return class of the bean definition
     * @throws IllegalStateException if the given bean definition class can not
     * be resolved
     * @see org.springframework.beans.factory.config.BeanDefinition#setBeanClassName(String)
     * @see org.springframework.beans.factory.support.AbstractBeanDefinition#resolveBeanClass(ClassLoader)
     */
    protected Class resolveBeanClass(BeanDefinition beanDefinition) throws IllegalStateException {
        try {
            return ((AbstractBeanDefinition) beanDefinition).resolveBeanClass(ClassUtils.getDefaultClassLoader());
        } catch (ClassNotFoundException e) {
            throw new IllegalStateException(
                    "Could not resolve class [" + beanDefinition.getBeanClassName() + "] of caching listener");
        }
    }

}