Java tutorial
/********************************************************************************** * $URL$ * $Id$ *********************************************************************************** * * Copyright (c) 2007 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 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.Values; import org.muse.ambrosia.util.ControllerImpl; import org.muse.mneme.api.Assessment; import org.muse.mneme.api.AssessmentPermissionException; import org.muse.mneme.api.AssessmentPolicyException; import org.muse.mneme.api.AssessmentService; import org.muse.mneme.api.AttachmentService; import org.muse.mneme.api.DrawPart; import org.muse.mneme.api.ManualPart; import org.muse.mneme.api.Part; import org.sakaiproject.entity.api.EntityManager; import org.sakaiproject.entity.api.Reference; import org.sakaiproject.tool.api.ToolManager; import org.sakaiproject.util.StringUtil; import org.sakaiproject.util.Web; /** * The /assessment_edit view for the mneme tool. */ public class AssessmentEditView extends ControllerImpl { /** Our log. */ private static Log M_log = LogFactory.getLog(AssessmentEditView.class); /** Assessment service. */ protected AssessmentService assessmentService = null; /** Dependency: AttachmentService. */ protected AttachmentService attachmentService = null; /** Dependency: EntityManager. */ protected EntityManager entityManager = null; /** tool manager reference. */ 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 { // sort, aid if (params.length != 4) { throw new IllegalArgumentException(); } String sort = params[2]; String assessmentId = params[3]; Assessment assessment = assessmentService.getAssessment(assessmentId); if (assessment == null) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } // security check if (!assessmentService.allowEditAssessment(assessment)) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } // clear the assessment of any empty parts (if not mint, which would end up causing it to become a stale mint and vanish!) if (!assessment.getMint()) { try { assessment.getParts().removeEmptyParts(); this.assessmentService.saveAssessment(assessment); } catch (AssessmentPermissionException e) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } catch (AssessmentPolicyException e) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.policy))); return; } } // collect information: the selected assessment context.put("assessment", assessment); context.put("sortcode", sort); // value holders for the selection checkboxes Values values = this.uiService.newValues(); context.put("ids", values); // render uiService.render(ui, context); } /** * Final initialization, once all dependencies are set. */ public void init() { super.init(); M_log.info("init()"); } /** * {@inheritDoc} */ public void post(HttpServletRequest req, HttpServletResponse res, Context context, String[] params) throws IOException { // sort, aid if (params.length != 4) { throw new IllegalArgumentException(); } String sort = params[2]; String assessmentId = params[3]; Assessment assessment = assessmentService.getAssessment(assessmentId); if (assessment == null) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } // security check if (!assessmentService.allowEditAssessment(assessment)) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } // setup the model: the selected assessment context.put("assessment", assessment); // value holders for the selection checkboxes Values values = this.uiService.newValues(); context.put("ids", values); // for the upload of attachments Upload upload = new Upload(this.toolManager.getCurrentPlacement().getContext(), AttachmentService.DOCS_AREA, false, this.attachmentService); context.put("upload", upload); // read the form String destination = uiService.decode(req, context); // save the attachments upload if (upload.getUpload() != null) { assessment.getPresentation().addAttachment(upload.getUpload()); } // handle an attachments remove if (destination.startsWith("REMOVE:")) { String[] parts = StringUtil.split(destination, ":"); if (parts.length != 2) { throw new IllegalArgumentException(); } String refString = parts[1]; Reference ref = this.entityManager.newReference(refString); // remove from the assessment assessment.getPresentation().removeAttachment(ref); // remove the attachment // TODO: really? this.attachmentService.removeAttachment(ref); // stay here destination = context.getDestination(); } try { if (destination.equals("DRAW")) { DrawPart dPart = assessment.getParts().addDrawPart(); this.assessmentService.saveAssessment(assessment); // create url for draw destination = "/part_edit/" + sort + "/" + assessment.getId() + "/" + dPart.getId(); } else if (destination.equals("MANUAL")) { ManualPart mPart = assessment.getParts().addManualPart(); this.assessmentService.saveAssessment(assessment); // create url for manual destination = "/part_edit/" + sort + "/" + assessment.getId() + "/" + mPart.getId(); } else if (destination.equals("DELETE")) { for (String id : values.getValues()) { Part part = assessment.getParts().getPart(id); if (part == null) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid))); return; } // remove part assessment.getParts().removePart(part); } this.assessmentService.saveAssessment(assessment); destination = context.getDestination(); } else { this.assessmentService.saveAssessment(assessment); } } catch (AssessmentPermissionException e) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized))); return; } catch (AssessmentPolicyException e) { // redirect to error res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.policy))); return; } // redirect to the next destination 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 EntityManager. * * @param manager * The EntityManager. */ public void setEntityManager(EntityManager manager) { entityManager = manager; } /** * Set the tool manager. * * @param manager * The tool manager. */ public void setToolManager(ToolManager manager) { toolManager = manager; } }