testaction.java

基于STRUTS的网络调查应用

/*
 * Created on 25-ene-2005 0:23:52
 *
 */
package com.martincuervo.javatest.web.actions;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

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

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.DynaActionForm;

import com.martincuervo.javatest.business.delegate.DelegateFactory;
import com.martincuervo.javatest.business.vo.AnswerVO;
import com.martincuervo.javatest.business.vo.QuestionVO;

/**
 * @author Jorge Martin Cuervo <[e-mail]>
 *
 */
public class TestAction extends Action {

	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws Exception {

		HttpSession session = request.getSession();
		DynaActionForm dynaForm = (DynaActionForm)form;
		ActionForward actionForward = null;
		
		/*
		 * Creo los objetos en la session si no existen
		 */
		if (session.getAttribute("questions") == null) {
			List questions = DelegateFactory.getTestDelegate().getQuestions();
			Collections.shuffle(questions);
			
			session.setAttribute("questions", questions.toArray(new QuestionVO[0]));
			session.setAttribute("actual_question", new Integer(0));
			session.setAttribute("answers", new HashSet[questions.size()]);
		}
		
		/*
		 * leo las respuestas y el numero de pregunta actual 
		 */
		int i =	((Integer)session.getAttribute("actual_question")).intValue();
		Set[] answers = (Set[])session.getAttribute("answers");
		
		/*
		 * Si hay respuesta avanzamos 
		 */
		if (dynaForm.get("correct") != null 
				&& ((Object[])dynaForm.get("correct")).length>0 ) {
			
			answers[i] = new HashSet(Arrays.asList(
					(Integer[])dynaForm.get("correct")	));
			
			i++;
			session.setAttribute("actual_question", new Integer(i));
			session.setAttribute("answers", answers);
		}
		
		
		/*
		 * Si no he finalizado... 
		 */
		if (i < answers.length) {
			QuestionVO question = 
				((QuestionVO[])session.getAttribute("questions"))[i];
		
			/*
			 * el enunciado de la pregunta y cuantas respuestas son correctas
			 */
			request.setAttribute("question", question);
			request.setAttribute("countCorrect", 
					new Integer(getCorrectAmount(question)) );
			
			actionForward = mapping.findForward("next");
		} else {
			actionForward = mapping.findForward("success");
		}

		
		return actionForward;
	}
	
	/**
	 * Obtiene el numero de respuestas correctas de una pregunta
	 * 
	 * @param question
	 * @return
	 */
	private static int getCorrectAmount(QuestionVO question) {
		int countCorrect = 0;
		for (Iterator i = question.getAnswers().iterator(); i.hasNext();) {
			AnswerVO element = (AnswerVO) i.next();
			
			countCorrect += (element.isCorrect() ? 1 : 0);
		}
		
		return countCorrect;
	}
}