Subversion Repositories bacoAlunos

package pt.estgp.estgweb.web.controllers.utils;

import jomm.utils.MessageResources;

import org.apache.log4j.Logger;

import org.apache.struts.action.*;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import pt.estgp.estgweb.web.controllers.ApplicationDispatchController;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.Iterator;

/**

 * Created by jorgemachado on 27/12/16.

 *

 * Classes extending this Controller must implment the following API in each service

 * and must define the following service names in parameter :

 *

 *    ->"serviceJson"<-

 *

 * when dispatch = executeService

 * JSONObject serviceName(ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Throwable;

 *

 *

 * when dispatch = executeServiceOkFail

 * Boolean serviceName(ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Throwable;

 *

 */

public abstract class AbstractWidgetAjaxController extends ApplicationDispatchController

{

    private static final 1.5.0/docs/api/java/util/logging/Logger.html">Logger logger = 1.5.0/docs/api/java/util/logging/Logger.html">Logger.getLogger(AbstractWidgetAjaxController.class);

    public static final 1.5.0/docs/api/java/lang/String.html">String WIDGET_REPONSE_KEY = "pt.estgp.estgweb.web.controllers.utils.AbstractWidgetAjaxController";

    public ActionForward executeService(

            ActionMapping mapping,

            ActionForm form,

            HttpServletRequest request,

            HttpServletResponse response)

        throws 1.5.0/docs/api/java/lang/Throwable.html">Throwable, ServletException

    {

        try

        {

            1.5.0/docs/api/java/lang/String.html">String serviceJson = request.getParameter("serviceJson");

            1.5.0/docs/api/java/lang/reflect/Method.html">Method serviceChild = this.getClass().getMethod(serviceJson,new 1.5.0/docs/api/java/lang/Class.html">Class[]{ActionForm.class,HttpServletRequest.class,HttpServletResponse.class});

            JSONObject responseJson = (JSONObject) serviceChild.invoke(this, form, request, response);

            prepareResponse(responseJson,request,response);

            return mapping.findForward("JSON_WidgetAjax_RESPONSE");

        }

        catch(1.5.0/docs/api/java/lang/reflect/InvocationTargetException.html">InvocationTargetException e)

        {

            prepareError(e.getCause(),request,response);

            return mapping.findForward("JSON_WidgetAjax_RESPONSE_ERROR");

        }

        catch(1.5.0/docs/api/java/lang/Throwable.html">Throwable e)

        {

            prepareError(e,request,response);

            return mapping.findForward("JSON_WidgetAjax_RESPONSE_ERROR");

        }

    }

    public ActionForward executeSimpleServiceOkFail(

            ActionMapping mapping,

            ActionForm form,

            HttpServletRequest request,

            HttpServletResponse response)

            throws 1.5.0/docs/api/java/lang/Throwable.html">Throwable, ServletException

    {

        try

        {

            1.5.0/docs/api/java/lang/String.html">String serviceJson = request.getParameter("serviceJson");

            1.5.0/docs/api/java/lang/reflect/Method.html">Method serviceChild = this.getClass().getMethod(serviceJson,new 1.5.0/docs/api/java/lang/Class.html">Class[]{ActionForm.class,HttpServletRequest.class,HttpServletResponse.class});

            1.5.0/docs/api/java/lang/Boolean.html">Boolean responseBoolean = (1.5.0/docs/api/java/lang/Boolean.html">Boolean) serviceChild.invoke(this, form, request, response);

            if(responseBoolean)

            {

                /**

                 * RESPONSE IS A JSON OBJECT LIKE THIS:

                 * {

                 *     "service" : "ok"

                 *     "messages" : "...."

                 * }

                 */

                JSONObject jsonObject = new JSONObject();

                jsonObject.put("service-simple-response","ok");

                prepareResponse(jsonObject, request, response);

                return mapping.findForward("JSON_WidgetAjax_RESPONSE");

            }

            else

            {

                /**

                 * RESPONSE IS A JSON OBJECT LIKE THIS:

                 * {

                 *     "service" : "fail",

                 *     "errors" : "...."

                 * }

                 */

                JSONObject jsonObject = new JSONObject();

                jsonObject.put("service-simple-response","fail");

                prepareResponse(jsonObject, request, response);

                return mapping.findForward("JSON_WidgetAjax_RESPONSE");

            }

        }

        catch(1.5.0/docs/api/java/lang/reflect/InvocationTargetException.html">InvocationTargetException e)

        {

            prepareError(e.getCause(),request,response);

            return mapping.findForward("JSON_WidgetAjax_RESPONSE_ERROR");

        }

        catch(1.5.0/docs/api/java/lang/Throwable.html">Throwable e)

        {

            prepareError(e,request,response);

            return mapping.findForward("JSON_WidgetAjax_RESPONSE_ERROR");

        }

    }

    /**

     * RESPONSE IS A JSON OBJECT LIKE THIS:

     * {

     *     "service" : "ok" OR "fail" if has errors,

     *     "response" : { userResponseJson },

     *     "messages" :

     *          [

     *              "MESSAGE 1",

     *              "MESSAGE 2",

     *          ],

     *     "errors" :

     *          [

     *              "ERROR 1",

     *              "ERROR 2",

     *          ]

     * }

     * @param object

     * @param request

     * @param response

     * @throws JSONException

     */

    private void prepareResponse(JSONObject object,HttpServletRequest request,HttpServletResponse response)

            throws JSONException

    {

        ActionMessages messages = super.getMessages(request);

        ActionMessages errors = super.getErrors(request);

        JSONObject responseObject = new JSONObject();

        if(object.has("service-simple-response"))

        {

            responseObject.put("service",object.getString("service-simple-response"));

            responseObject.put("response",object.getString("service-simple-response"));

        }

        else

        {

            1.5.0/docs/api/java/lang/String.html">String service = errors == null || errors.isEmpty() ? "ok" : "fail";

            responseObject.put("service",service);

            responseObject.put("response",object);

        }

        if(messages != null)

        {

            JSONArray messagesJson = new JSONArray();

            responseObject.put("messages",messagesJson);

            1.5.0/docs/api/java/util/Iterator.html">Iterator reports = messages.get();

            while (reports.hasNext())

            {

                ActionMessage report = (ActionMessage) reports.next();

                if(report instanceof StringMessage)

                {

                    1.5.0/docs/api/java/lang/String.html">String messageTranslated = ((StringMessage)report).toString();

                    if(messageTranslated != null)

                        messagesJson.put(messageTranslated);

                }

                else

                {

                    1.5.0/docs/api/java/lang/String.html">String messageTranslated = MessageResources.getMessage(request,report.getKey(),report.getValues());

                    if(messageTranslated != null)

                        messagesJson.put(messageTranslated);

                }

            }

        }

        if(errors != null)

        {

            JSONArray errorsJson = new JSONArray();

            responseObject.put("errors",errorsJson);

            1.5.0/docs/api/java/util/Iterator.html">Iterator reports = errors.get();

            while (reports.hasNext())

            {

                ActionMessage report = (ActionMessage) reports.next();

                if(report instanceof StringMessage)

                {

                    1.5.0/docs/api/java/lang/String.html">String messageTranslated = ((StringMessage)report).toString();

                    if(messageTranslated != null)

                        errorsJson.put(messageTranslated);

                }

                else

                {

                    1.5.0/docs/api/java/lang/String.html">String messageTranslated = MessageResources.getMessage(request,report.getKey(),report.getValues());

                    if(messageTranslated != null)

                        errorsJson.put(messageTranslated);

                }

            }

        }

        request.setAttribute(WIDGET_REPONSE_KEY, responseObject);

    }

    /**

     * RESPONSE IS A JSON OBJECT LIKE THIS:

     * {

     *     "service" : "error"

     *     "exception" : "string with exception.toString()"

     * }

     * @param e

     * @param request

     * @param response

     * @throws JSONException

     */

    public static void prepareError(1.5.0/docs/api/java/lang/Throwable.html">Throwable e,HttpServletRequest request,HttpServletResponse response) throws JSONException

    {

        logger.error(e,e);

        //request.setAttribute(WIDGET_REPONSE_KEY,e.toString());

        JSONObject errorObject = new JSONObject();

        errorObject.put("service","error");

        errorObject.put("exception",e.toString());

        request.setAttribute(WIDGET_REPONSE_KEY,errorObject);

    }

}