gettestanswersdistributionaction.java

老外的在线考试

/*
 * CyberTester - J2EE Web application for creating, delivering and managing tests/exams/surveys.
 * Copyright (C) 2004 CyberDemia Research and Services Pty Ltd
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (see the file COPYING); if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * See the COPYING file located in the top-level-directory of
 * the archive of this program for complete text of license.
 */
package com.cyberdemia.cybertester.admin.report;

import java.awt.Font;
import java.io.ByteArrayOutputStream;
import java.util.*;

import javax.servlet.http.*;
import org.apache.struts.action.*;
import com.cyberdemia.school.*;
import com.cyberdemia.cybertester.*;
import java.util.logging.*;
import com.cyberdemia.cybertester.admin.*;
import com.cyberdemia.cybertester.common.*;
import org.jfree.chart.*;
import org.jfree.chart.title.*;
import org.jfree.data.*;
import org.jfree.chart.labels.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.renderer.*;
import org.jfree.chart.imagemap.*;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.PlotOrientation;

/**
 *
 * GetTestAnswersDistributionAction is a Struts action to retrieve distribution of
 * all users' answers for a test.
 *
 * @version $Revision: 1.11 $ at $Date: 2004/06/22 17:06:05 $ by $Author: alexycyap $
 * @author Alexander Yap, Nita Ambedkar
 */
public final class GetTestAnswersDistributionAction extends AbstractAdminAction
{
    protected ActionForward doPerform(
        ActionMapping mapping, ActionForm form,
        HttpServletRequest request, HttpServletResponse response,
        HttpSession session) throws Exception
    {
        String ownerHierId = (String)session.getAttribute(AdminConstants.SELECTED_HIERARCHY_ID_KEY);
        if (ownerHierId==null)
        {
            ActionErrors errors = new ActionErrors();
            errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.hierarchyNode.unselected"));
            saveErrors(request, errors);
            return mapping.findForward(Constants.ERROR);
        }

        Logger logger = CyberTesterUtils.getLogger();

        // If test ID sent by the form is 0, treat it as null.
        Integer rawTestId = CyberTesterUtils.getIntegerParameterOrRequestAttribute(request, AdminConstants.TEST_ID_KEY);
        Integer testId = null;
        if ((rawTestId != null) && (rawTestId.intValue() > 0) )
        {
            testId = rawTestId;
        }

        try
        {
            TestManagerHome tMgrHome = CyberTesterUtils.getTestManagerHome();
            TestManager testMgr = (TestManager)tMgrHome.create();
            TestData[] testList = testMgr.getTests(ownerHierId, true);
            request.setAttribute( AdminConstants.TEST_LIST_KEY, testList );

            if (testId!=null)
            {
                logger.fine("Retrieving answers distribution assigned to Test ID "+testId);
                request.setAttribute(AdminConstants.TEST_ID_KEY, testId);
                // Calculation various distributions by questions
                ReportGeneratorHome reportGenHome = CyberTesterUtils.getReportGeneratorHome();
                ReportGenerator reportGen = (ReportGenerator)reportGenHome.create();
                DefaultCategoryDataset answerDataset = new DefaultCategoryDataset();
                DefaultCategoryDataset percentageDataset = new DefaultCategoryDataset();
                Map answersDistMap = reportGen.getAnswersDistributionForTest(testId);
                Map percentageDistMap = reportGen.getScorePercentageDistributionForTest(testId, ReportGeneratorBean.PERCENTAGE_BY_QUESTION);
                Iterator quesIndexIter = answersDistMap.keySet().iterator();
                int maxAnswerCount = 20;
                while( quesIndexIter.hasNext())
                {
                    Integer quesIndex = (Integer)quesIndexIter.next();
                    Integer answerDistVal = (Integer)answersDistMap.get(quesIndex);
                    if (answerDistVal.intValue() > maxAnswerCount )
                    {
                        maxAnswerCount = answerDistVal.intValue();
                    }
                    Double percentageDistVal = (Double)percentageDistMap.get(quesIndex);
                    answerDataset.addValue(answerDistVal, "0", quesIndex);
                    percentageDataset.addValue(percentageDistVal, "0", quesIndex);
                }

                JFreeChart answerDistChart = ChartFactory.createBarChart(
                    "",
                    "Question index", "Number of correct answers", answerDataset, PlotOrientation.VERTICAL, false, true, false);
                answerDistChart.setTitle(new TextTitle("Number of Correct Answers vs Questions", new Font("SansSerif",Font.BOLD, 12)));

                /*  Change for new version of JFree Chart 9.18 Change begin */
                ((CategoryAxis)answerDistChart.getCategoryPlot().getDomainAxis()).setCategoryLabelPositions(new CategoryLabelPositions());
                /*  Change for new version of JFree Chart 9.18 Change End */
                ValueAxis rangeAxis = answerDistChart.getCategoryPlot().getRangeAxis();
                /*  Change for new version of JFree Chart 9.18 Change begin */
                rangeAxis.setUpperBound(maxAnswerCount);
                rangeAxis.setLowerBound(0.0);
                /*  Change for new version of JFree Chart 9.18 Change begin */
                CategoryItemRenderer renderer = answerDistChart.getCategoryPlot().getRenderer();
                renderer.setLabelGenerator(
                    new  CategoryLabelGenerator()
                    {
                        public String generateLabel(CategoryDataset data, int series, int category)
                        {
                            return data.getValue(series, category).toString();
                        }
                         public String generateToolTip(CategoryDataset data, int series, int category)
                        {
                            return "Number of correct answers for question "+data.getColumnKey(category)
                                                    +" : "+data.getValue(series, category).toString();
                        }

                    }
                );
                /*  Change for new version of JFree Chart 9.18 Change End */
                answerDistChart.setAntiAlias(true);

                JFreeChart percentageDistChart = ChartFactory.createBarChart(
                    "",
                    "Question index", "Percentage of correct answers", percentageDataset, PlotOrientation.VERTICAL, false, true, false);
                percentageDistChart.setTitle(new TextTitle("Percentage of Correct Answers vs Questions", new Font("SansSerif",Font.BOLD, 12)));
                /*  Change for new version of JFree Chart 9.18 Change begin */
                ((CategoryAxis)percentageDistChart.getCategoryPlot().getDomainAxis()).setCategoryLabelPositions(new CategoryLabelPositions());
                /*  Change for new version of JFree Chart 9.18 Change End */
                rangeAxis = percentageDistChart.getCategoryPlot().getRangeAxis();
                /*  Change for new version of JFree Chart 9.18 Change begin */
                rangeAxis.setUpperBound(100.0);
                rangeAxis.setLowerBound(0.0);
                renderer = percentageDistChart.getCategoryPlot().getRenderer();
                renderer.setLabelGenerator(
                    new CategoryLabelGenerator()
                    {
                        public String generateLabel(CategoryDataset data, int series, int category)
                        {
                            return data.getValue(series, category).toString();
                        }
                         public String generateToolTip(CategoryDataset data, int series, int category)
                        {
                            return "Number of correct answers for question "+
                                data.getColumnKey(category)+" : "
                                + data.getValue(series, category).toString();
                        }

                    }
                );
                /*  Change for new version of JFree Chart 9.18 Change End */
                percentageDistChart.setAntiAlias(true);

                int width = Math.max(300, 100+(answerDataset.getColumnCount()*20));
                try
                {
                    width = Integer.parseInt( request.getParameter("width") );
                }
                catch (NumberFormatException nfex)
                {
                    // Ignore, width unchanged.
                }

                int height = 400;
                try
                {
                    height = Integer.parseInt( request.getParameter("height") );
                }
                catch (NumberFormatException nfex)
                {
                    // Ignore, height unchanged.
                }

                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
                ChartUtilities.writeChartAsPNG( baos , answerDistChart,width, height, info );
                ChartDataCache cache = new ChartDataCache();
                cache.data = baos.toByteArray();
                cache.info = info;
                Map chartsCache = (Map)session.getAttribute(Constants.CHARTS_CACHE_KEY);
                String answerDistChartId = "C"+String.valueOf(System.currentTimeMillis());
                chartsCache.put(answerDistChartId, cache);

               /*  Change for new version of JFree Chart 9.20 to retrieve the ImageMapAreaTag Begin*/

                request.setAttribute(AdminConstants.ANSWER_COUNT_DISTRIBUTION_CHART_INFO_KEY, CyberTesterUtils.getImageMapAreaList(cache.info) );
                /*  Change for new version of JFree Chart 9.20 to retrieve the ImageMapAreaTag End */
                request.setAttribute(AdminConstants.ANSWER_COUNT_DISTRIBUTION_CHART_ID_KEY, answerDistChartId );

                baos = new ByteArrayOutputStream();
                info = new ChartRenderingInfo(new StandardEntityCollection());
                ChartUtilities.writeChartAsPNG( baos , percentageDistChart,width, height, info );
                cache = new ChartDataCache();
                cache.data = baos.toByteArray();
                cache.info = info;
                String percentageDistChartId = "P"+String.valueOf(System.currentTimeMillis());
                chartsCache.put(percentageDistChartId, cache);



                request.setAttribute(AdminConstants.ANSWER_PERCENTAGE_DISTRIBUTION_CHART_INFO_KEY, CyberTesterUtils.getImageMapAreaList(cache.info) );
                request.setAttribute(AdminConstants.ANSWER_PERCENTAGE_DISTRIBUTION_CHART_ID_KEY, percentageDistChartId );

            }

        }
        catch (Exception ex)
        {
            logger.log( Level.SEVERE, "Error getting answers distribution", ex);
            throw ex;
        }

        return mapping.findForward(Constants.SUCCESS);
    }



}