Java tutorial
/********************************************************************************** * $URL$ * $Id$ *********************************************************************************** * * Copyright (c) 2005, 2006, 2007, 2008 The Sakai Foundation * * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.tool.section.jsf.backingbean; import java.io.Serializable; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; import javax.faces.context.FacesContext; import javax.faces.model.SelectItem; import org.apache.commons.lang.StringUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.sakaiproject.section.api.coursemanagement.CourseSection; import org.sakaiproject.section.api.coursemanagement.ParticipationRecord; import org.sakaiproject.section.api.coursemanagement.User; import org.sakaiproject.section.api.exception.RoleConfigurationException; import org.sakaiproject.section.api.facade.Role; import org.sakaiproject.tool.section.decorator.SectionDecorator; import org.sakaiproject.tool.section.jsf.JsfUtil; /** * Controls the edit managers page (where TAs are assigned to sections). * * @author <a href="mailto:jholtzman@berkeley.edu">Josh Holtzman</a> * */ public class EditManagersBean extends CourseDependentBean implements Serializable { private static final long serialVersionUID = 1L; private static final Log log = LogFactory.getLog(EditManagersBean.class); // For the right-side list box protected List<SelectItem> selectedUsers; // For the left-side list box protected List<SelectItem> availableUsers; protected String sectionUuid; protected String sectionTitle; protected String sectionDescription; protected boolean externallyManaged; /** * Compares ParticipationRecords by users' sortNames. */ static Comparator sortNameComparator = new Comparator() { public int compare(Object o1, Object o2) { ParticipationRecord manager1 = (ParticipationRecord) o1; ParticipationRecord manager2 = (ParticipationRecord) o2; return manager1.getUser().getSortName().compareTo(manager2.getUser().getSortName()); } }; protected SectionDecorator initializeFields() { // Determine whether this course is externally managed externallyManaged = getSectionManager().isExternallyManaged(getCourse().getUuid()); // Get the section to edit String sectionUuidFromParam = (String) FacesContext.getCurrentInstance().getExternalContext() .getRequestParameterMap().get("sectionUuid"); if (sectionUuidFromParam != null) { sectionUuid = sectionUuidFromParam; } SectionDecorator currentSection = new SectionDecorator(getSectionManager().getSection(sectionUuid), true); sectionTitle = currentSection.getTitle(); // Generate the description // String sectionMeetingTimes = currentSection.getMeetings(); // if(StringUtils.trimToNull(sectionMeetingTimes) == null) { sectionDescription = sectionTitle; // } else { // sectionDescription = JsfUtil.getLocalizedMessage("section_description", // new String[] {sectionTitle, sectionMeetingTimes}); // } return currentSection; } protected void populateSelectedUsers(List participationRecords) { // Build the list of items for the right-side list box selectedUsers = new ArrayList<SelectItem>(); for (Iterator iter = participationRecords.iterator(); iter.hasNext();) { ParticipationRecord record = (ParticipationRecord) iter.next(); SelectItem item = new SelectItem(record.getUser().getUserUid(), record.getUser().getSortName()); selectedUsers.add(item); } } public void init() { initializeFields(); // Get the current users in the manager role for this section List<ParticipationRecord> selectedManagers = getSectionManager().getSectionTeachingAssistants(sectionUuid); Collections.sort(selectedManagers, sortNameComparator); populateSelectedUsers(selectedManagers); // Build the list of items for the left-side box. Since the selected (right-side) // participation records are linked to a section, while the available records // are linked to the course, we can not use collection manipulation on these // objects. So, generate a set of user uuids to filter out the currently // selected users from the available (left side) list. Set<String> selectedUserUuids = new HashSet<String>(); for (Iterator<ParticipationRecord> iter = selectedManagers.iterator(); iter.hasNext();) { ParticipationRecord manager = iter.next(); selectedUserUuids.add(manager.getUser().getUserUid()); } List availableManagers = getSectionManager().getSiteTeachingAssistants(getSiteContext()); Collections.sort(availableManagers, sortNameComparator); availableUsers = new ArrayList<SelectItem>(); for (Iterator iter = availableManagers.iterator(); iter.hasNext();) { User manager = ((ParticipationRecord) iter.next()).getUser(); if (!selectedUserUuids.contains(manager.getUserUid())) { availableUsers.add(new SelectItem(manager.getUserUid(), manager.getSortName())); } } } public String update() { CourseSection section = getSectionManager().getSection(sectionUuid); // The section might have been deleted if (section == null) { JsfUtil.addErrorMessage(JsfUtil.getLocalizedMessage("error_section_deleted")); return "overview"; } Set userUids = getHighlightedUsers("memberForm:selectedUsers"); try { getSectionManager().setSectionMemberships(userUids, Role.TA, sectionUuid); } catch (RoleConfigurationException rce) { JsfUtil.addErrorMessage(JsfUtil.getLocalizedMessage("role_config_error")); return null; } JsfUtil.addRedirectSafeInfoMessage( JsfUtil.getLocalizedMessage("edit_manager_successful", new String[] { sectionTitle })); return "overview"; } public String cancel() { return "overview"; } protected Set<String> getHighlightedUsers(String componentId) { Set<String> userUids = new HashSet<String>(); String[] highlighted = (String[]) FacesContext.getCurrentInstance().getExternalContext() .getRequestParameterValuesMap().get(componentId); if (highlighted != null) { for (int i = 0; i < highlighted.length; i++) { userUids.add(highlighted[i]); } } return userUids; } public List<SelectItem> getAvailableUsers() { return availableUsers; } public void setAvailableUsers(List<SelectItem> availableUsers) { this.availableUsers = availableUsers; } public List<SelectItem> getSelectedUsers() { return selectedUsers; } public void setSelectedUsers(List<SelectItem> selectedUsers) { this.selectedUsers = selectedUsers; } public String getSectionUuid() { return sectionUuid; } public void setSectionUuid(String sectionUuid) { this.sectionUuid = sectionUuid; } public String getSectionTitle() { return sectionTitle; } public boolean isExternallyManaged() { return externallyManaged; } public String getSectionDescription() { return sectionDescription; } public String getAbbreviatedSectionTitle() { return StringUtils.abbreviate(sectionTitle, 15); } }