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.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.AttachmentService; import org.muse.mneme.api.Question; 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 /grading view for the mneme tool. */ public class GradeQuestionView extends ControllerImpl { /** Our log. */ private static Log M_log = LogFactory.getLog(GradeQuestionView.class); /** Assessment service. */ protected AssessmentService assessmentService = null; /** AttachmentService service. */ protected AttachmentService attachmentService = 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]grades sort code, [3]aid, [4]qid, |optional ->| [5]sort, [6]page, [7] anchor if (params.length < 5) throw new IllegalArgumentException(); // check for user permission to access the assessments for grading if (!this.submissionService.allowEvaluate(toolManager.getCurrentPlacement().getContext())) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } // the sort for the grades view context.put("sort_grades", params[2]); // assessment Assessment assessment = this.assessmentService.getAssessment(params[3]); if (assessment == null) { res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } context.put("assessment", assessment); // question Question question = assessment.getParts().getQuestion(params[4]); if (question == null) { res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } context.put("question", question); // sort code String sortCode = null; if (params.length > 5) { sortCode = params[5]; } if (sortCode == null) { if (assessment.getAnonymous()) { sortCode = "1A"; } else { sortCode = "0A"; } } // parse into a sort SubmissionService.FindAssessmentSubmissionsSort sort = null; if ((sortCode.charAt(0) == '0') && (sortCode.charAt(1) == 'A')) { sort = SubmissionService.FindAssessmentSubmissionsSort.userName_a; } else if ((sortCode.charAt(0) == '0') && (sortCode.charAt(1) == 'D')) { sort = SubmissionService.FindAssessmentSubmissionsSort.userName_d; } else if ((sortCode.charAt(0) == '1') && (sortCode.charAt(1) == 'A')) { sort = SubmissionService.FindAssessmentSubmissionsSort.final_a; } else if ((sortCode.charAt(0) == '1') && (sortCode.charAt(1) == 'D')) { sort = SubmissionService.FindAssessmentSubmissionsSort.final_d; } if (sort == null) { res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } context.put("sort_column", sortCode.charAt(0)); context.put("sort_direction", sortCode.charAt(1)); // get the size - from all submissions Integer maxAnswers = this.submissionService.countSubmissionAnswers(assessment, question); // paging parameter String pagingParameter = null; if (params.length > 6) pagingParameter = params[6]; if (pagingParameter == null) { pagingParameter = "1-" + Integer.toString(this.pageSizes.get(0)); } Paging paging = uiService.newPaging(); paging.setMaxItems(maxAnswers); paging.setCurrentAndSize(pagingParameter); context.put("paging", paging); // get the answers - from all submissions List<Answer> answers = this.submissionService.findSubmissionAnswers(assessment, question, sort, paging.getSize() == 0 ? null : paging.getCurrent(), paging.getSize() == 0 ? null : paging.getSize()); context.put("answers", answers); // so we know we are grading context.put("grading", Boolean.TRUE); // pages sizes if (this.pageSizes.size() > 1) { context.put("pageSizes", this.pageSizes); } if (params.length > 7) { String anchor = params[7]; if (!anchor.equals("-")) { context.put("anchor", anchor); } } 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.GradeQuestionView")); if (pageSize != null) setPageSize(pageSize); if (this.pageSizes.isEmpty()) { this.pageSizes.add(Integer.valueOf(10)); } M_log.info("init()"); } /** * {@inheritDoc} */ public void post(HttpServletRequest req, HttpServletResponse res, Context context, String[] params) throws IOException { // [2]grades sort code, [3]aid, [4]qid, |optional ->| [5]sort, [6]page, [7] anchor if (params.length < 5) throw new IllegalArgumentException(); // check for user permission to access the assessments for grading if (!this.submissionService.allowEvaluate(toolManager.getCurrentPlacement().getContext())) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } final SubmissionService submissionService = this.submissionService; PopulatingSet answers = uiService.newPopulatingSet(new Factory() { public Object get(String id) { Answer answer = submissionService.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); } String newDestination = null; // 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) { // find the answer, id=parts[0], ref=parts[1] for (Object o : answers.getSet()) { Answer answer = (Answer) o; if (answer.getId().equals(parts[0])) { Reference ref = this.attachmentService.getReference(parts[1]); answer.getEvaluation().removeAttachment(ref); this.attachmentService.removeAttachment(ref); break; } } } } } 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 if (params.length > 7) { params[7] = newAnchor; destination = StringUtil.unsplit(params, "/"); } else { // assessment Assessment assessment = this.assessmentService.getAssessment(params[3]); if (assessment == null) { res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } // sort code String sortCode = null; if (params.length > 5) { sortCode = params[5]; } if (sortCode == null) { if (assessment.getAnonymous()) { sortCode = "1A"; } else { sortCode = "0A"; } } // paging parameter String pagingParameter = null; if (params.length > 6) pagingParameter = params[6]; if (pagingParameter == null) { pagingParameter = "1-" + Integer.toString(this.pageSizes.get(0)); } destination = context.getDestination() + "/" + sortCode + "/" + pagingParameter + "/" + newAnchor; } } // save try { this.submissionService.evaluateAnswers(answers.getSet()); } catch (AssessmentPermissionException e) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unexpected))); 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))); } /** * Set the AssessmentService. * * @param service * the AssessmentService. */ public void setAssessmentService(AssessmentService service) { this.assessmentService = service; } /** * 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)); } } /** * Set the ServerConfigurationService. * * @param service * the ServerConfigurationService. */ public void setServerConfigurationService(ServerConfigurationService service) { this.serverConfigurationService = service; } /** * Set the SubmissionService. * * @param service * the SubmissionService. */ public void setSubmissionService(SubmissionService service) { this.submissionService = service; } /** * Set the ToolManager. * * @param service * the ToolManager. */ public void setToolManager(ToolManager service) { this.toolManager = service; } }