Java tutorial
/** * Copyright 2002 Instituto Superior Tcnico * * This file is part of FenixEdu Core. * * FenixEdu Core is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * FenixEdu Core 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with FenixEdu Core. If not, see <http://www.gnu.org/licenses/>. */ package net.sourceforge.fenixedu.presentationTier.Action.manager.enrolments; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; import javax.imageio.ImageIO; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sourceforge.fenixedu.dataTransferObject.curriculumLineLog.SearchCurriculumLineLog; import net.sourceforge.fenixedu.domain.EnrolmentPeriod; import net.sourceforge.fenixedu.domain.EnrolmentPeriodInCurricularCourses; import net.sourceforge.fenixedu.domain.ExecutionSemester; import net.sourceforge.fenixedu.domain.degree.DegreeType; import net.sourceforge.fenixedu.domain.log.CurriculumLineLog; import net.sourceforge.fenixedu.domain.log.EnrolmentLog; import net.sourceforge.fenixedu.domain.student.Student; import net.sourceforge.fenixedu.presentationTier.Action.base.FenixDispatchAction; import net.sourceforge.fenixedu.presentationTier.Action.manager.ManagerApplications.ManagerStudentsApp; import net.sourceforge.fenixedu.util.EnrolmentAction; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.fenixedu.bennu.portal.EntryPoint; import org.fenixedu.bennu.portal.StrutsFunctionality; import org.jfree.chart.ChartFactory; import org.jfree.chart.JFreeChart; import org.jfree.data.time.Second; import org.jfree.data.time.TimeTableXYDataset; import org.joda.time.DateTime; import org.joda.time.Interval; import pt.ist.fenixWebFramework.struts.annotations.Forward; import pt.ist.fenixWebFramework.struts.annotations.Forwards; import pt.ist.fenixWebFramework.struts.annotations.Mapping; @StrutsFunctionality(app = ManagerStudentsApp.class, path = "curriculum-logs", titleKey = "title.curriculum.line.logs") @Mapping(path = "/curriculumLineLogs", module = "manager") @Forwards({ @Forward(name = "searchCurriculumLineLogs", path = "/manager/viewCurriculumLineLogs.jsp"), @Forward(name = "viewCurriculumLineLogStatistics", path = "/manager/viewCurriculumLineLogStatistics.jsp") }) public class CurriculumLineLogsDA extends FenixDispatchAction { @EntryPoint public ActionForward prepareViewCurriculumLineLogs(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { request.setAttribute("bean", new SearchCurriculumLineLog()); return mapping.findForward("searchCurriculumLineLogs"); } public ActionForward viewCurriculumLineLogs(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { final SearchCurriculumLineLog searchCurriculumLineLog = getRenderedObject(); request.setAttribute("bean", searchCurriculumLineLog); Student student = Student.readStudentByNumber(searchCurriculumLineLog.getStudentNumber()); if (student == null) { addActionMessage(request, "exception.student.does.not.exist"); return mapping.findForward("searchCurriculumLineLogs"); } request.setAttribute("curriculumLineLogs", student.getCurriculumLineLogs(searchCurriculumLineLog.getExecutionPeriod())); return mapping.findForward("searchCurriculumLineLogs"); } public static class CurriculumLineLogStatisticsCalculator { private static final int INTERVAL_SIZE_IN_MILLIS = 300000; final Interval enrolmentPeriod; final int[] enrolments; final int[] unenrolments; public CurriculumLineLogStatisticsCalculator(final ExecutionSemester executionSemester) { enrolmentPeriod = findEnrolmentPeriod(executionSemester); final long start = enrolmentPeriod.getStart().getMillis(); final long durationMillis = enrolmentPeriod.toDurationMillis(); final int numberOfIntervals = (int) (durationMillis / INTERVAL_SIZE_IN_MILLIS) + 1; enrolments = new int[numberOfIntervals]; unenrolments = new int[numberOfIntervals]; for (final CurriculumLineLog curriculumLineLog : executionSemester.getCurriculumLineLogsSet()) { if (curriculumLineLog instanceof EnrolmentLog) { final DateTime dateTime = curriculumLineLog.getDateDateTime(); if (enrolmentPeriod.contains(dateTime)) { final long offset = dateTime.getMillis() - start; final int i = (int) offset / INTERVAL_SIZE_IN_MILLIS; if (curriculumLineLog.getAction() == EnrolmentAction.ENROL) { enrolments[i]++; } else { unenrolments[i]++; } } } } } public Interval getEnrolmentPeriod() { return enrolmentPeriod; } public int[] getEnrolments() { return enrolments; } public int[] getUnenrolments() { return unenrolments; } private Interval findEnrolmentPeriod(final ExecutionSemester executionSemester) { DateTime start = null, end = null; for (final EnrolmentPeriod enrolmentPeriod : executionSemester.getEnrolmentPeriodSet()) { if (enrolmentPeriod instanceof EnrolmentPeriodInCurricularCourses) { final DegreeType degreeType = enrolmentPeriod.getDegreeCurricularPlan().getDegreeType(); if (degreeType == DegreeType.BOLONHA_DEGREE || degreeType == DegreeType.BOLONHA_INTEGRATED_MASTER_DEGREE || degreeType == DegreeType.BOLONHA_INTEGRATED_MASTER_DEGREE) { if (start == null || start.isAfter(enrolmentPeriod.getStartDateDateTime())) { start = enrolmentPeriod.getStartDateDateTime(); } if (end == null || end.isBefore(enrolmentPeriod.getEndDateDateTime())) { end = enrolmentPeriod.getEndDateDateTime(); } } } } return start == null || end == null ? null : new Interval(start, end); } public byte[] getOperationsChart() throws IOException { final TimeTableXYDataset dataset = new TimeTableXYDataset(); DateTime index = enrolmentPeriod.getStart(); for (int i = 0; i < enrolments.length; i++) { final Second second = new Second(index.toDate()); index = index.plus(INTERVAL_SIZE_IN_MILLIS); final int enrolmentCount = enrolments[i]; dataset.add(second, enrolmentCount, "Enrolments"); final int unenrolmentCount = unenrolments[i]; dataset.add(second, unenrolmentCount, "Unenrolments"); } return getOperationsChart(dataset); } private byte[] getOperationsChart(final TimeTableXYDataset dataset) throws IOException { final JFreeChart jfreeChart = ChartFactory.createTimeSeriesChart("", "", "", dataset, true, true, true); final BufferedImage bufferedImage = jfreeChart.createBufferedImage(1000, 500); final ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); ImageIO.write(bufferedImage, "jpg", outputStream); bufferedImage.flush(); outputStream.close(); return outputStream.toByteArray(); } } public ActionForward viewCurriculumLineLogStatistics(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { final ExecutionSemester executionSemester = getDomainObject(request, "executionSemesterId"); if (executionSemester != null) { request.setAttribute("executionSemester", executionSemester); final CurriculumLineLogStatisticsCalculator curriculumLineLogStatisticsCalculator = new CurriculumLineLogStatisticsCalculator( executionSemester); request.setAttribute("curriculumLineLogStatisticsCalculator", curriculumLineLogStatisticsCalculator); return mapping.findForward("viewCurriculumLineLogStatistics"); } return prepareViewCurriculumLineLogs(mapping, form, request, response); } public ActionForward viewCurriculumLineLogStatisticsChartOperations(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException { final ExecutionSemester executionSemester = getDomainObject(request, "executionSemesterId"); if (executionSemester != null) { final CurriculumLineLogStatisticsCalculator curriculumLineLogStatisticsCalculator = new CurriculumLineLogStatisticsCalculator( executionSemester); ServletOutputStream writer = null; try { writer = response.getOutputStream(); response.setContentType("image/jpeg"); writer.write(curriculumLineLogStatisticsCalculator.getOperationsChart()); writer.flush(); } finally { writer.close(); response.flushBuffer(); } } return null; } }