/** SpringUtil.java

{{IS_NOTE
    Purpose:
        
    Description:
        
    History:
        Thu Jun  1 13:53:53     2006, Created by henrichen
}}IS_NOTE

Copyright (C) 2006 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
}}IS_RIGHT
*/
package org.zkoss.zkplus.spring;

import javax.servlet.ServletContext;

import org.springframework.beans.factory.BeanNotOfRequiredTypeException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.zkoss.zk.ui.Execution;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.UiException;

/***
 * SpringUtil, a Spring utility.
 * <p>Applicable to Spring Framework version 2.x or later</p>
 * @author henrichen
 */
public class SpringUtil {
    /***
     * Get the spring application context.
     */
    public static ApplicationContext getApplicationContext() {
        Execution exec = Executions.getCurrent();
        if (exec == null) {
            throw new UiException("SpringUtil can be called only under ZK environment!");
        }
        
        return WebApplicationContextUtils.getRequiredWebApplicationContext(
                (ServletContext)exec.getDesktop().getWebApp().getNativeContext());
    }
    
    /***
     * Get the spring bean by the specified name.
     */        
    public static Object getBean(String name) {
        Object o = null;
        try {
            if(getApplicationContext().containsBean(name)) {
                o = getApplicationContext().getBean(name);
            }
        } catch (NoSuchBeanDefinitionException ex) {
            // ignore
        }
        return o;
    }

    /***
     * Get the spring bean by the specified name and class.
     */        
    public static Object getBean(String name, Class cls) {
        Object o = null;
        try {
            if(getApplicationContext().containsBean(name)) {
                o = getApplicationContext().getBean(name, cls);
            }
        } catch (NoSuchBeanDefinitionException ex) {
            // ignore
        } catch (BeanNotOfRequiredTypeException e) {
            // ignore
        }
        return o;
    }
}