org.zkoss.jsp.zul.impl.VariableResolvers Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of zuljsp Show documentation

The JSP tags for encapsulating ZK XUL components

The newest version!

/* VariableResolvers.java

{{IS_NOTE
	Purpose:
		
	Description:
		
	History:
		2008/3/18 2008, Created by Ian Tsai
}}IS_NOTE

Copyright (C) 2007 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
	This program is distributed under GPL Version 2.0 in the hope that
	it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.jsp.zul.impl;

import java.util.LinkedList;
import java.util.List;

import javax.servlet.jsp.JspContext;

import org.zkoss.zk.ui.Page;

/**
 * @author Ian Tsai
 *
 */
public class VariableResolvers {
	
	private static final String KEY = VariableResolvers.class.getName()+"!KEY";
	
	private final List varResInfoList;
	private final JspContext context;

	
	/**
	 * 
	 * @param context
	 */
	public VariableResolvers(JspContext context) {
		super();
		this.context = context;
		varResInfoList = new LinkedList();
	}

	/**
	 * get VariableResolvers instance from JspContext
	 * @param context the place to store Initiators. 
	 * @return VariableResolvers
	 */
	public static VariableResolvers getInstance(JspContext context)
	{
		VariableResolvers vres = 
			(VariableResolvers) context.getAttribute(KEY);
		if(vres==null)
			context.setAttribute(KEY, vres = new VariableResolvers(context));
		return vres;
	}
	
	/**
	 *  Add new initiator and it's args into this handler. 
	 * @param reso
	 */
	public void add(VariableResolverInfo reso){
		varResInfoList.add(reso);
	}
	
	/**
	 * create VariableResolvers using VariableResolverInfo, and attach them to the page.
	 * @param page a page that will be attached with VariableResolvers. 
	 * @throws Exception if any bad things happened while  VariableResolver construction.
	 */
	public void initPageVariableResolvers( Page page) throws Exception{
		
		for(VariableResolverInfo vrInfo: varResInfoList)
			page.addVariableResolver(vrInfo.newVariableResolver());
	}
	/**
	 * 
	 * @return JspContext
	 */
	public JspContext getContext() {
		return context;
	}

}