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/*
 * Copyright 2008-2010 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
 *
 * https://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.plugin.core.support;

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

import org.springframework.beans.factory.FactoryBean;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.lang.NonNull;

/**
 * Factory to create bean lists for a given type. Exposes all beans of the configured type that can be found in the
 * {@link org.springframework.context.ApplicationContext}.
 *
 * @author Oliver Gierke
 */
public class BeanListFactoryBean extends AbstractTypeAwareSupport implements FactoryBean> {

	private static final Comparator COMPARATOR = new AnnotationAwareOrderComparator();

	/*
	 * (non-Javadoc)
	 * @see org.springframework.beans.factory.FactoryBean#getObject()
	 */
	@NonNull
	public List getObject() {

		List beans = new ArrayList();
		beans.addAll(getBeans());
		Collections.sort(beans, COMPARATOR);

		return beans;
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.beans.factory.FactoryBean#getObjectType()
	 */
	@NonNull
	public Class getObjectType() {
		return List.class;
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.beans.factory.FactoryBean#isSingleton()
	 */
	public boolean isSingleton() {
		return true;
	}
}