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org/springframework/context/weaving/LoadTimeWeaverAwareProcessor.java
/*
 * Copyright 2002-2009 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 org.springframework.context.weaving;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.instrument.classloading.LoadTimeWeaver;
import org.springframework.util.Assert;

/**
 {@link org.springframework.beans.factory.config.BeanPostProcessor}
 * implementation that passes the context's default {@link LoadTimeWeaver}
 * to beans that implement the {@link LoadTimeWeaverAware} interface.
 *
 <p>{@link org.springframework.context.ApplicationContext Application contexts}
 * will automatically register this with their underlying {@link BeanFactory bean factory},
 * provided that a default <code>LoadTimeWeaver</code> is actually available.
 *
 <p>Applications should not use this class directly.
 *
 @author Juergen Hoeller
 @since 2.5
 @see LoadTimeWeaverAware
 @see org.springframework.context.ConfigurableApplicationContext#LOAD_TIME_WEAVER_BEAN_NAME
 */
public class LoadTimeWeaverAwareProcessor implements BeanPostProcessor, BeanFactoryAware {

  private LoadTimeWeaver loadTimeWeaver;

  private BeanFactory beanFactory;


  /**
   * Create a new <code>LoadTimeWeaverAwareProcessor</code> that will
   * auto-retrieve the {@link LoadTimeWeaver} from the containing
   {@link BeanFactory}, expecting a bean named
   {@link ConfigurableApplicationContext#LOAD_TIME_WEAVER_BEAN_NAME "loadTimeWeaver"}.
   */
  public LoadTimeWeaverAwareProcessor() {
  }

  /**
   * Create a new <code>LoadTimeWeaverAwareProcessor</code> for the given
   {@link LoadTimeWeaver}.
   <p>If the given <code>loadTimeWeaver</code> is <code>null</code>, then a
   <code>LoadTimeWeaver</code> will be auto-retrieved from the containing
   {@link BeanFactory}, expecting a bean named
   {@link ConfigurableApplicationContext#LOAD_TIME_WEAVER_BEAN_NAME "loadTimeWeaver"}.
   @param loadTimeWeaver the specific <code>LoadTimeWeaver</code> that is to be used
   */
  public LoadTimeWeaverAwareProcessor(LoadTimeWeaver loadTimeWeaver) {
    this.loadTimeWeaver = loadTimeWeaver;
  }

  /**
   * Create a new <code>LoadTimeWeaverAwareProcessor</code>.
   <p>The <code>LoadTimeWeaver</code> will be auto-retrieved from
   * the given {@link BeanFactory}, expecting a bean named
   {@link ConfigurableApplicationContext#LOAD_TIME_WEAVER_BEAN_NAME "loadTimeWeaver"}.
   @param beanFactory the BeanFactory to retrieve the LoadTimeWeaver from
   */
  public LoadTimeWeaverAwareProcessor(BeanFactory beanFactory) {
    this.beanFactory = beanFactory;
  }


  public void setBeanFactory(BeanFactory beanFactory) {
    this.beanFactory = beanFactory;
  }


  public Object postProcessBeforeInitialization(Object bean, String beanNamethrows BeansException {
    if (bean instanceof LoadTimeWeaverAware) {
      LoadTimeWeaver ltw = this.loadTimeWeaver;
      if (ltw == null) {
        Assert.state(this.beanFactory != null,
            "BeanFactory required if no LoadTimeWeaver explicitly specified");
        ltw = this.beanFactory.getBean(
            ConfigurableApplicationContext.LOAD_TIME_WEAVER_BEAN_NAME, LoadTimeWeaver.class);
      }
      ((LoadTimeWeaverAwarebean).setLoadTimeWeaver(ltw);
    }
    return bean;
  }

  public Object postProcessAfterInitialization(Object bean, String name) {
    return bean;
  }

}