Java tutorial
/********************************************************************************** * $URL$ * $Id$ *********************************************************************************** * * Copyright (c) 2007, 2008 The Regents of the University of Michigan & Foothill College, ETUDES Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * **********************************************************************************/ package org.muse.mneme.tool; import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.muse.ambrosia.api.Context; import org.muse.ambrosia.api.Paging; import org.muse.ambrosia.api.PopulatingSet; import org.muse.ambrosia.api.PopulatingSet.Factory; import org.muse.ambrosia.api.PopulatingSet.Id; import org.muse.ambrosia.util.ControllerImpl; import org.muse.mneme.api.Answer; import org.muse.mneme.api.Assessment; import org.muse.mneme.api.AssessmentPermissionException; import org.muse.mneme.api.AssessmentService; import org.muse.mneme.api.AssessmentType; import org.muse.mneme.api.AttachmentService; import org.muse.mneme.api.Submission; import org.muse.mneme.api.SubmissionService; import org.sakaiproject.component.api.ServerConfigurationService; import org.sakaiproject.entity.api.Reference; import org.sakaiproject.tool.api.ToolManager; import org.sakaiproject.util.StringUtil; import org.sakaiproject.util.Web; /** * The /grade_submission view for the mneme tool. */ public class GradeSubmissionView extends ControllerImpl { /** Our log. */ private static Log M_log = LogFactory.getLog(GradeSubmissionView.class); /** Assessment service. */ protected AssessmentService assessmentService = null; /** AttachmentService service. */ protected AttachmentService attachmentService = null; /** The default page size. */ protected Integer defaultPageSize = null; /** Configuration: the page sizes for the view. */ protected List<Integer> pageSizes = new ArrayList<Integer>(); /** Dependency: ServerConfigurationService. */ protected ServerConfigurationService serverConfigurationService = null; /** Submission Service */ protected SubmissionService submissionService = null; /** Dependency: ToolManager */ protected ToolManager toolManager = null; /** * Shutdown. */ public void destroy() { M_log.info("destroy()"); } /** * {@inheritDoc} */ public void get(HttpServletRequest req, HttpServletResponse res, Context context, String[] params) throws IOException { // [2]sid, [3] paging, [4] anchor, [5]next/prev sort (optional- leave out to disable next/prev), optionally followed by a return destination if (params.length < 5) throw new IllegalArgumentException(); Submission submission = this.submissionService.getSubmission(params[2]); if (submission == null) { res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } // check for user permission to access the submission for grading if (!this.submissionService.allowEvaluate(submission)) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } context.put("submission", submission); // next and prev, based on the sort String sortCode = "userName_a"; SubmissionService.FindAssessmentSubmissionsSort sort = null; int destinationStartsAt = 6; if (params.length > 4) sortCode = params[5]; try { sort = SubmissionService.FindAssessmentSubmissionsSort.valueOf(sortCode); } catch (IllegalArgumentException e) { // no sort, so it must be part of destination destinationStartsAt = 5; sortCode = "userName_a"; } if (sort != null) { // one submission per user (i.e. 'official' only), except for survey, where we consider them all Boolean official = Boolean.valueOf(submission.getAssessment().getType() != AssessmentType.survey); String[] nextPrev = submissionService.findPrevNextSubmissionIds(submission, sort, official); if (nextPrev[0] != null) context.put("prev", nextPrev[0]); if (nextPrev[1] != null) context.put("next", nextPrev[1]); } context.put("sort", sortCode); String destination = null; if (params.length > destinationStartsAt) { destination = "/" + StringUtil.unsplit(params, destinationStartsAt, params.length - destinationStartsAt, "/"); } // if not specified, go to the main grade_assessment page for this assessment else { destination = "/grade_assessment/0A/" + submission.getAssessment().getId(); } context.put("return", destination); // paging parameter String pagingParameter = null; if (params.length > 3) pagingParameter = params[3]; if ((pagingParameter == null) || (pagingParameter.length() == 0) || (pagingParameter.equals("-"))) { pagingParameter = "1-" + Integer.toString(this.defaultPageSize); } // paging Paging paging = uiService.newPaging(); paging.setMaxItems(submission.getAnswers().size()); paging.setCurrentAndSize(pagingParameter); context.put("paging", paging); // pages sizes if (this.pageSizes.size() > 1) { context.put("pageSizes", this.pageSizes); } // pick the page of answers List<Answer> answers = submission.getAnswersOrdered(); if (paging.getSize() != 0) { // start at ((pageNum-1)*pageSize) int start = ((paging.getCurrent().intValue() - 1) * paging.getSize().intValue()); if (start < 0) start = 0; if (start > answers.size()) start = answers.size() - 1; // end at ((pageNum)*pageSize)-1, or max-1, (note: subList is not inclusive for the end position) int end = paging.getCurrent().intValue() * paging.getSize().intValue(); if (end < 0) end = 0; if (end > answers.size()) end = answers.size(); answers = answers.subList(start, end); } context.put("answers", answers); String anchor = params[4]; if (!anchor.equals("-")) context.put("anchor", anchor); // needed by some of the delegates to show the score context.put("grading", Boolean.TRUE); uiService.render(ui, context); } /** * Final initialization, once all dependencies are set. */ public void init() { super.init(); String pageSize = StringUtil.trimToNull( this.serverConfigurationService.getString("pageSize@org.muse.mneme.tool.GradeSubmissionView")); if (pageSize != null) setPageSize(pageSize); if (this.pageSizes.isEmpty()) { this.pageSizes.add(Integer.valueOf(1)); this.pageSizes.add(Integer.valueOf(25)); this.pageSizes.add(Integer.valueOf(50)); this.pageSizes.add(Integer.valueOf(100)); this.pageSizes.add(Integer.valueOf(0)); this.defaultPageSize = Integer.valueOf(50); } M_log.info("init()"); } /** * {@inheritDoc} */ public void post(HttpServletRequest req, HttpServletResponse res, Context context, String[] params) throws IOException { // [2]sid, [3] paging, [4] anchor, [5]next/prev sort (optional- leave out to disable next/prev), optionally followed by a return destination if (params.length < 5) throw new IllegalArgumentException(); final Submission submission = this.submissionService.getSubmission(params[2]); if (submission == null) { res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } // check for user permission to access the submission for grading if (!this.submissionService.allowEvaluate(submission)) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } context.put("submission", submission); // so we can deal with the answers by id PopulatingSet answers = uiService.newPopulatingSet(new Factory() { public Object get(String id) { Answer answer = submission.getAnswer(id); return answer; } }, new Id() { public String getId(Object o) { return ((Answer) o).getId(); } }); context.put("answers", answers); // read form String destination = this.uiService.decode(req, context); // post-process the answers for (Object o : answers.getSet()) { Answer a = (Answer) o; a.getTypeSpecificAnswer().consolidate(destination); } // check for remove if (destination.startsWith("STAY_REMOVE:")) { String[] parts = StringUtil.splitFirst(destination, ":"); if (parts.length == 2) { parts = StringUtil.splitFirst(parts[1], ":"); if (parts.length == 2) { Reference ref = this.attachmentService.getReference(parts[1]); this.attachmentService.removeAttachment(ref); // if this is for the overall evaluation if (parts[0].equals("SUBMISSION")) { submission.getEvaluation().removeAttachment(ref); } else { // find the answer, id=parts[0], ref=parts[1] Answer answer = submission.getAnswer(parts[0]); if (answer != null) { answer.getEvaluation().removeAttachment(ref); } } } } } if (destination.startsWith("STAY_")) { String newAnchor = "-"; String[] parts = StringUtil.splitFirst(destination, ":"); if (parts.length == 2) { String[] anchor = StringUtil.splitFirst(parts[1], ":"); if (anchor.length > 0) { newAnchor = anchor[0]; } } // rebuild the current destination with the new anchor params[4] = newAnchor; destination = StringUtil.unsplit(params, "/"); } // save graded submission try { this.submissionService.evaluateSubmission(submission); } catch (AssessmentPermissionException e) { res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } // if there was an upload error, send to the upload error if ((req.getAttribute("upload.status") != null) && (!req.getAttribute("upload.status").equals("ok"))) { res.sendRedirect(res.encodeRedirectURL( Web.returnUrl(req, "/error/" + Errors.upload + "/" + req.getAttribute("upload.limit")))); return; } res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, destination))); } /** * @param assessmentService * the assessmentService to set */ public void setAssessmentService(AssessmentService assessmentService) { this.assessmentService = assessmentService; } /** * Set the AttachmentService. * * @param service * the AttachmentService. */ public void setAttachmentService(AttachmentService service) { this.attachmentService = service; } /** * Set the the page size for the view. * * @param sizes * The the page sizes for the view - integers, comma separated. */ public void setPageSize(String sizes) { this.pageSizes.clear(); String[] parts = StringUtil.split(sizes, ","); for (String part : parts) { this.pageSizes.add(Integer.valueOf(part)); } if (!this.pageSizes.isEmpty()) { // use the first as the default this.defaultPageSize = this.pageSizes.get(0); // sort, putting 0 (all) at the end Collections.sort(this.pageSizes); if (this.pageSizes.get(0).equals(Integer.valueOf(0))) { this.pageSizes.remove(0); this.pageSizes.add(Integer.valueOf(0)); } } } /** * Set the ServerConfigurationService. * * @param service * the ServerConfigurationService. */ public void setServerConfigurationService(ServerConfigurationService service) { this.serverConfigurationService = service; } /** * @param submissionService * the submissionService to set */ public void setSubmissionService(SubmissionService submissionService) { this.submissionService = submissionService; } /** * @param toolManager * the toolManager to set */ public void setToolManager(ToolManager toolManager) { this.toolManager = toolManager; } }