/*
 * Copyright 2012-2014 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.boot.context.embedded;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;

/**
 * {@link BeanPostProcessor} that applies all {@link EmbeddedServletContainerCustomizer}s
 * from the bean factory to {@link ConfigurableEmbeddedServletContainer} beans.
 *
 * @author Dave Syer
 * @author Phillip Webb
 */
public class EmbeddedServletContainerCustomizerBeanPostProcessor
		implements BeanPostProcessor, ApplicationContextAware {

	private ApplicationContext applicationContext;

	private List<EmbeddedServletContainerCustomizer> customizers;

	@Override
	public void setApplicationContext(ApplicationContext applicationContext)
			throws BeansException {
		this.applicationContext = applicationContext;
	}

	@Override
	public Object postProcessBeforeInitialization(Object bean, String beanName)
			throws BeansException {
		if (bean instanceof ConfigurableEmbeddedServletContainer) {
			postProcessBeforeInitialization((ConfigurableEmbeddedServletContainer) bean);
		}
		return bean;
	}

	@Override
	public Object postProcessAfterInitialization(Object bean, String beanName)
			throws BeansException {
		return bean;
	}

	private void postProcessBeforeInitialization(
			ConfigurableEmbeddedServletContainer bean) {
		for (EmbeddedServletContainerCustomizer customizer : getCustomizers()) {
			customizer.customize(bean);
		}
	}

	private Collection<EmbeddedServletContainerCustomizer> getCustomizers() {
		if (this.customizers == null) {
			// Look up does not include the parent context
			this.customizers = new ArrayList<EmbeddedServletContainerCustomizer>(
					this.applicationContext
							.getBeansOfType(EmbeddedServletContainerCustomizer.class,
									false, false)
							.values());
			Collections.sort(this.customizers, AnnotationAwareOrderComparator.INSTANCE);
			this.customizers = Collections.unmodifiableList(this.customizers);
		}
		return this.customizers;
	}

}
