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/* ZkAjaxHandler.java

{{IS_NOTE
	Purpose:
		
	Description:
		
	History:
		Nov 5, 2008 12:16:29 PM, Created by henrichen
}}IS_NOTE

Copyright (C) 2008 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.spring.js.ajax;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.js.ajax.AjaxHandler;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Execution;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.Events;

/**
 * Handle ZK Event trigger Flow transition.
 * 
 * @author henrichen
 * @since 1.1
 */
public class ZkAjaxHandler implements AjaxHandler {
	public final static String POPUP = "zkoss.spring.webflow.POPUP";
	public final static String POPUP_EVENT = "onZkSpringWebFlow_POPUP_EVENT";
	
	public boolean isAjaxRequest(HttpServletRequest request, HttpServletResponse response) {
		return Executions.getCurrent() != null;
	}

	public void sendAjaxRedirect(String targetUrl, HttpServletRequest request,
			HttpServletResponse response, boolean popup) throws IOException {
		final String contextPath = request.getContextPath();
		if (targetUrl.startsWith(contextPath)) {
			targetUrl = targetUrl.substring(contextPath.length());
		}
		if (popup) {
			doPopup(targetUrl);
		} else {
			Executions.getCurrent().sendRedirect(targetUrl);
		}
	}
	
	private void doPopup(String targetUrl) {
		final Execution exec = Executions.getCurrent();
		final Event event = (Event) exec.getAttribute("actionEvent");
		final Component popTarget = event.getTarget();
		exec.setAttribute(ZkAjaxHandler.POPUP, popTarget);
		Events.sendEvent(new Event(POPUP_EVENT, popTarget, targetUrl));
	}
}