org.opensprout.osaf.util.ApplicationContextUtils.java Source code

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Here is the source code for org.opensprout.osaf.util.ApplicationContextUtils.java

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/**
 * Copyright (c) 2008 OpenSprout Team.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 */
package org.opensprout.osaf.util;

import java.util.Map;

import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;

/**
 * Util class for ApplicationContext
 * 
 * @author Whiteship
 * @see org.springframework.context.ApplicationContext
 */
public class ApplicationContextUtils {

    public static <T> T getBeanByType(ApplicationContext applicationContext, Class<T> clazz) {
        Map beanMap = applicationContext.getBeansOfType(clazz);
        int size = beanMap.size();
        if (size == 0) {
            if (applicationContext.getParent() != null)
                return getBeanByType(applicationContext.getParent(), clazz);
            throw new NoSuchBeanDefinitionException(clazz.getSimpleName());
        }
        if (size > 1)
            throw new NoSuchBeanDefinitionException(
                    "No unique bean definition type [" + clazz.getSimpleName() + "]");
        return (T) beanMap.values().iterator().next();
    }
}