br.com.caelum.vraptor.ioc.spring.ComponentScanner.java Source code

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Here is the source code for br.com.caelum.vraptor.ioc.spring.ComponentScanner.java

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/***
 * Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
 * All rights reserved.
 *
 * 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 br.com.caelum.vraptor.ioc.spring;

import java.util.Arrays;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.annotation.AnnotationBeanNameGenerator;
import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;

import br.com.caelum.vraptor.ioc.ComponentFactory;
import br.com.caelum.vraptor.ioc.Container;

/**
 * @author Fabio Kung
 */
class ComponentScanner extends ClassPathBeanDefinitionScanner {

    private static final Logger logger = LoggerFactory.getLogger(ComponentScanner.class);

    private final ConfigurableListableBeanFactory registry;
    private final Container container;

    public ComponentScanner(ConfigurableListableBeanFactory registry, Container container) {
        super((BeanDefinitionRegistry) registry, false);
        this.registry = registry;
        this.container = container;
        addIncludeFilter(new ComponentTypeFilter());

        setScopeMetadataResolver(new VRaptorScopeResolver());
        setBeanNameGenerator(new UniqueBeanNameGenerator(new AnnotationBeanNameGenerator()));
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    protected void postProcessBeanDefinition(AbstractBeanDefinition beanDefinition, String beanName) {
        super.postProcessBeanDefinition(beanDefinition, beanName);
        beanDefinition.setPrimary(true);
        beanDefinition.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_CONSTRUCTOR);
        try {
            Class<?> componentType = Class.forName(beanDefinition.getBeanClassName());
            if (ComponentFactory.class.isAssignableFrom(componentType)
                    && checkCandidate(beanName, beanDefinition)) {
                registry.registerSingleton(beanDefinition.getBeanClassName(),
                        new ComponentFactoryBean(container, componentType));
            }
        } catch (ClassNotFoundException e) {
            logger.warn("Class " + beanDefinition.getBeanClassName()
                    + " was not found during bean definition proccess");
        } catch (ExceptionInInitializerError e) {
            // log and rethrow antipattern is needed, this is rally important
            logger.warn("Class " + beanDefinition.getBeanClassName() + " has problems during initialization",
                    e.getCause());
            throw e;
        }
    }

    @Override
    public int scan(String... basePackages) {
        logger.debug("scanning " + Arrays.toString(basePackages));
        return super.scan(basePackages);
    }

    @Override
    protected boolean checkCandidate(String beanName, BeanDefinition beanDefinition) throws IllegalStateException {
        if (registry.containsBeanDefinition(beanName) && registry.getBeanDefinition(beanName).getBeanClassName()
                .equals(beanDefinition.getBeanClassName())) {
            logger.warn(
                    "bean already found previously, there is probably no need to declare its package in web.xml:"
                            + beanDefinition.getBeanClassName());
            return false;
        }
        return super.checkCandidate(beanName, beanDefinition);
    }

}