servletlabelresovler.java

来自「ZK 基础介绍 功能操作 模块 结合数据库操作」· Java 代码 · 共 50 行

/* ServletLabelResovler.java

{{IS_NOTE
	Purpose:
		
	Description:
		
	History:
		Mon Jun 12 13:58:56     2006, Created by tomyeh
}}IS_NOTE

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

{{IS_RIGHT
}}IS_RIGHT
*/
package org.zkoss.web.util.resource;

import org.zkoss.util.resource.Labels;
import org.zkoss.xel.VariableResolver;
import org.zkoss.xel.XelException;

import org.zkoss.web.servlet.xel.RequestContext;
import org.zkoss.web.servlet.xel.RequestContexts;

/**
 * Used with {@link Labels} to resolve XEL expressions in labels.
 *
 * @author tomyeh
 */
public class ServletLabelResovler implements VariableResolver {
	public ServletLabelResovler() {
	}

	//VariableResolver//
	public Object resolveVariable(String name) throws XelException {
		final Object o = Labels.getLabel(name);
		if (o != null)
			return o;

		final RequestContext jc = RequestContexts.getCurrent();
		if (jc != null) {
			final VariableResolver parent = jc.getVariableResolver();
			if (parent != null)
				return parent.resolveVariable(name);
		}
		return null;
	}
}