com.fr.web.core.WebActionsDispatcher

package com.fr.web.core;

import com.fr.general.web.ParameterConstants;
import com.fr.plugin.injectable.PluginModule;
import com.fr.stable.StringUtils;
import com.fr.stable.plugin.ExtraClassManagerProvider;
import com.fr.stable.web.RequestCMDReceiver;
import com.fr.web.utils.WebUtils;

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

/**
 * @author kunsnat E-mail:kunsnat@gmail.com
 * @version 创建时间：2011-12-7 上午10:52:44
 * 类说明: 各种Service请求之后, Action执行中心. 处理各种Action
 */
public class WebActionsDispatcher {

	private static final String PLUGIN_ID = "pid";

	/**
	 * 处理有sessionid的所有cmd对应的请求
	 * 
	 * @param req HTTP请求
	 * @param res HTTP响应
	 * @param sessionID 会话id
	 * @param actions 所有操作
	 * 
	 *
	 * @date 2014-9-25-下午6:12:55
	 *
	 */
	public static void dealForActionCMD(HttpServletRequest req, HttpServletResponse res, 
			String sessionID, RequestCMDReceiver[] actions) throws Exception {
		
		dealForActionDefaultCmd(req, res, sessionID, actions, null);
	}

	/**
	 * 处理拥有默认cmd的对应请求
	 * 
	 * @param req HTTP请求
	 * @param res HTTP响应
	 * @param sessionID 会话id
	 * @param actions 所有操作
	 * @param defaultCmd 默认的操作
	 * 
	 *
	 * @date 2014-9-25-下午6:12:55
	 *
	 */
    public static void dealForActionDefaultCmd(HttpServletRequest req, HttpServletResponse res,
                                               String sessionID, RequestCMDReceiver[] actions, String defaultCmd) throws Exception {
        String cmd = WebUtils.getHTTPRequestParameter(req, "cmd");
        if (StringUtils.isEmpty(cmd)) {
            cmd = defaultCmd;
        }
        dealForActionCMD(req, res, sessionID, actions, cmd);
    }

	/**
	 * 处理有sessionid的cmd对应的请求
	 * 
	 * @param req HTTP请求
	 * @param res HTTP响应
	 * @param sessionID 会话id
	 * @param actions 所有操作
	 * @param cmd 指定的操作
	 * 
	 *
	 * @date 2014-9-25-下午6:12:55
	 *
	 */
	public static void dealForActionCMD(HttpServletRequest req, HttpServletResponse res, String sessionID, RequestCMDReceiver[] actions, String cmd) throws Exception {

        String op = WebUtils.getHTTPRequestParameter(req, ParameterConstants.OP);
		String pluginID = WebUtils.getHTTPRequestParameter(req, PLUGIN_ID);
		ExtraClassManagerProvider pluginProvider = PluginModule.getAgent(PluginModule.ExtraCore);
		RequestCMDReceiver actionCMD = null;
		if (pluginProvider != null) {
			 actionCMD = pluginProvider.getActionCMD(op, cmd, pluginID);
		}
        if (actionCMD != null) {
            actionCMD.actionCMD(req, res, sessionID);
        } else  {
            for (RequestCMDReceiver action : actions) {
                String acceptCmd = action.getCMD();
                if (acceptCmd.equalsIgnoreCase(cmd)) {
                    action.actionCMD(req, res, sessionID);
                    return;
                }
            }
        }
	}

	/**
	 * 处理没有sessionid的cmd对应的请求
	 * 
	 * @param req HTTP请求
	 * @param res HTTP响应
	 * @param actions 所有操作
	 * 
	 *
	 * @date 2014-9-25-下午6:12:55
	 *
	 */
	public static void dealForActionNoSessionIDCMD(HttpServletRequest req, HttpServletResponse res, 
			ActionNoSessionCMD[] actions) throws Exception {

		String op = WebUtils.getHTTPRequestParameter(req, ParameterConstants.OP);

		String cmd = WebUtils.getHTTPRequestParameter(req, "cmd");

		String pluginID = WebUtils.getHTTPRequestParameter(req, PLUGIN_ID);
		ExtraClassManagerProvider pluginProvider = PluginModule.getAgent(PluginModule.ExtraCore);
		RequestCMDReceiver actionCMD = null;
		if (pluginProvider != null) {
			actionCMD = pluginProvider.getActionCMD(op, cmd, pluginID);
		}
        if (actionCMD != null) {
            actionCMD.actionCMD(req, res);
        } else {
            for (ActionNoSessionCMD action : actions) {
                String acceptCmd = action.getCMD();
                if (acceptCmd.equalsIgnoreCase(cmd)) {
                    action.actionCMD(req, res);
                    return;
                }
            }
        }
	}
}

RequestCMDReceiver [] actions = new RequestCMDReceiver[]{
        new ActionA(),
        new ActionB()
}
//第一种分发方式，也是最常用的一种方式。这种方式会传入sessionID,主要用于需要根据sessionID获取到当前的报表，根据报表进一步的处理的场景
WebActionsDispatcher.dealForActionCMD( request, response, sessionID, actions);

RequestCMDReceiver [] actions = new RequestCMDReceiver[]{
        new ActionA(),
        new ActionB()
}
//第二种分发方式，功能跟第一种差不多，但主要是用于产品内部兼容一些历史原因导致的没有实现cmd的请求的规范处理。【主要是兼容用，插件里面也很少用】
WebActionsDispatcher.dealForActionDefaultCmd( request, response, sessionID, actions, "cmdA");

ActionNoSessionCMD [] actions = new ActionNoSessionCMD[]{
        new ActionA(),
        new ActionB()
}
//第三种分发方式，调用具体的Action时不会带入sessionID,主要用于报表访问时的一些公共信息的加载。（在8.0/9.0中主要用于决策平台的请求扩展）
WebActionsDispatcher.dealForActionNoSessionIDCMD( request, response, actions);