com.apporiented.spring.override.BeanOverrideProcessor.java Source code

Introduction

Here is the source code for com.apporiented.spring.override.BeanOverrideProcessor.java

Source

/* 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.apporiented.spring.override;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.ConstructorArgumentValues;
import org.springframework.core.PriorityOrdered;

/**
 * BeanFactoryPostProcessor that can be used to replace beans that have been
 * defined elsewhere. Use this class when you want to write a Riot module that
 * needs to replace a bean which is provided by another module.
 * <p>Simply defining a bean with the same id would not work, because the order
 * in which the module configurations are processed is not defined.  
 * 
 * @author Felix Gnass [fgnass at neteye dot de]
 */
public class BeanOverrideProcessor implements BeanFactoryPostProcessor, PriorityOrdered {

    private Logger log = LoggerFactory.getLogger(BeanOverrideProcessor.class);

    private String ref;

    private BeanDefinition beanDefinition;

    private boolean merge;

    private int order = 1;

    public void setRef(String ref) {
        this.ref = ref;
    }

    public void setBeanDefinition(BeanDefinition beanDefinition) {
        this.beanDefinition = beanDefinition;
    }

    public void setBeanReplacement(OverrideNamespaceHandler.BeanReplacement replacement) {
        setBeanDefinition(replacement.getBeanDefinition());
    }

    public void setMerge(boolean merge) {
        this.merge = merge;
    }

    public int getOrder() {
        return this.order;
    }

    public void setOrder(int order) {
        this.order = order;
    }

    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {

        BeanDefinition target = beanFactory.getBeanDefinition(ref);
        overwriteBeanDefinition(target, beanDefinition);
    }

    private void overwriteBeanDefinition(BeanDefinition target, BeanDefinition source) {
        log.debug("Replacing bean [" + ref + "] with a [" + source.getBeanClassName() + "]");

        target.setBeanClassName(source.getBeanClassName());
        ConstructorArgumentValues cas = target.getConstructorArgumentValues();
        cas.clear();
        cas.addArgumentValues(source.getConstructorArgumentValues());

        MutablePropertyValues pvs = target.getPropertyValues();
        if (!merge) {
            pvs.getPropertyValueList().clear();
        }
        pvs.addPropertyValues(source.getPropertyValues());
    }

}