com.sinosoft.one.data.jpa.repository.support.OneRepositoryInterfaceAwareBeanPostProcessor.java Source code

Introduction

Here is the source code for com.sinosoft.one.data.jpa.repository.support.OneRepositoryInterfaceAwareBeanPostProcessor.java

Source

/*
 * Copyright 2008-2011 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 com.sinosoft.one.data.jpa.repository.support;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.PropertyValue;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter;
import org.springframework.beans.factory.config.TypedStringValue;
import org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport;
import org.springframework.util.ClassUtils;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * A {@link org.springframework.beans.factory.config.SmartInstantiationAwareBeanPostProcessor} implementing
 * {@code #predictBeanType(Class, String)} to return the configured repository interface from
 * {@link org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport}s. This is done as shortcut to prevent the need of instantiating
 * {@link org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport}s just to find out what repository interface they actually create.
 *
 * @author Oliver Gierke
 */
class OneRepositoryInterfaceAwareBeanPostProcessor extends InstantiationAwareBeanPostProcessorAdapter
        implements BeanFactoryAware {

    private static final Log LOG = LogFactory.getLog(OneRepositoryInterfaceAwareBeanPostProcessor.class);
    private static final Class<?> REPOSITORY_TYPE = OneRepositoryFactoryBeanSupport.class;

    private final Map<String, Class<?>> cache = new ConcurrentHashMap<String, Class<?>>();
    private ConfigurableListableBeanFactory context;

    /*
     * (non-Javadoc)
     * @see org.springframework.beans.factory.BeanFactoryAware#setBeanFactory(org.springframework.beans.factory.BeanFactory)
     */
    public void setBeanFactory(BeanFactory beanFactory) {

        if (beanFactory instanceof ConfigurableListableBeanFactory) {
            this.context = (ConfigurableListableBeanFactory) beanFactory;
        }
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter#predictBeanType(java.lang.Class, java.lang.String)
     */
    @Override
    public Class<?> predictBeanType(Class<?> beanClass, String beanName) {

        if (null == context || !REPOSITORY_TYPE.isAssignableFrom(beanClass)) {
            return null;
        }

        BeanDefinition definition = context.getBeanDefinition(beanName);
        PropertyValue value = definition.getPropertyValues().getPropertyValue("repositoryInterface");

        Class<?> resolvedBeanClass = cache.get(beanName);

        if (cache.containsKey(beanName)) {
            return cache.get(beanName);
        }

        resolvedBeanClass = getClassForPropertyValue(value, beanName);
        cache.put(beanName, resolvedBeanClass);

        return resolvedBeanClass == Void.class ? null : resolvedBeanClass;
    }

    /**
     * Returns the class which is configured in the given {@link org.springframework.beans.PropertyValue}. In case it is not a
     * {@link org.springframework.beans.factory.config.TypedStringValue} or the value contained cannot be interpreted as {@link Class} it will return null.
     * 
     * @param propertyValue
     * @param beanName
     * @return
     */
    private Class<?> getClassForPropertyValue(PropertyValue propertyValue, String beanName) {

        Object value = propertyValue.getValue();
        String className = null;

        if (value instanceof TypedStringValue) {
            className = ((TypedStringValue) value).getValue();
        } else if (value instanceof String) {
            className = (String) value;
        } else if (value instanceof Class<?>) {
            return (Class<?>) value;
        } else {
            return Void.class;
        }

        try {
            return ClassUtils.resolveClassName(className,
                    OneRepositoryInterfaceAwareBeanPostProcessor.class.getClassLoader());
        } catch (IllegalArgumentException ex) {
            LOG.warn(String.format("Couldn't load class %s referenced as repository interface in bean %s!",
                    className, beanName));
            return Void.class;
        }
    }
}