Source Code Cross Referenced for FeedbackOptionsBean.java in  » ERP-CRM-Financial » sakai » org » sakaiproject » tool » gradebook » ui » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » ERP CRM Financial » sakai » org.sakaiproject.tool.gradebook.ui 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**********************************************************************************
002:         *
003:         * $Id: FeedbackOptionsBean.java 27835 2007-03-26 23:45:15Z ray@media.berkeley.edu $
004:         *
005:         ***********************************************************************************
006:         *
007:         * Copyright (c) 2005, 2006 The Regents of the University of California, The MIT Corporation
008:         *
009:         * Licensed under the Educational Community License, Version 1.0 (the "License");
010:         * you may not use this file except in compliance with the License.
011:         * You may obtain a copy of the License at
012:         *
013:         *      http://www.opensource.org/licenses/ecl1.php
014:         *
015:         * Unless required by applicable law or agreed to in writing, software
016:         * distributed under the License is distributed on an "AS IS" BASIS,
017:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018:         * See the License for the specific language governing permissions and
019:         * limitations under the License.
020:         *
021:         **********************************************************************************/package org.sakaiproject.tool.gradebook.ui;
022:
023:        import java.io.Serializable;
024:        import java.util.ArrayList;
025:        import java.util.Collections;
026:        import java.util.Iterator;
027:        import java.util.List;
028:
029:        import javax.faces.event.ActionEvent;
030:        import javax.faces.model.SelectItem;
031:
032:        import org.apache.commons.logging.Log;
033:        import org.apache.commons.logging.LogFactory;
034:        import org.sakaiproject.service.gradebook.shared.StaleObjectModificationException;
035:        import org.sakaiproject.tool.gradebook.GradeMapping;
036:        import org.sakaiproject.tool.gradebook.Gradebook;
037:        import org.sakaiproject.tool.gradebook.jsf.FacesUtil;
038:
039:        /**
040:         * Provides support for the student feedback options page, which also controls
041:         * grade-to-percentage mappings for the gradebook.
042:         */
043:        public class FeedbackOptionsBean extends GradebookDependentBean
044:                implements  Serializable {
045:            private static final Log log = LogFactory
046:                    .getLog(FeedbackOptionsBean.class);
047:
048:            // View maintenance fields - serializable.
049:
050:            /**
051:             * This is the one page in which the user can change what's on the screen
052:             * and have their current working inputs remembered without updating the
053:             * database. In other words, this is currently our only "what if?" workflow.
054:             * The following variable keeps bean initialization from overwriting stable
055:             * input fields from the database.
056:             */
057:            private boolean workInProgress;
058:
059:            /** Cache a copy of the gradebook object in the request thread, to keep track of all grade mapping changes */
060:            private Gradebook localGradebook;
061:
062:            private Long selectedGradeMappingId;
063:
064:            /** The list of select box items */
065:            private List gradeMappingsSelectItems;
066:
067:            // View into row-specific data.
068:            private List gradeRows;
069:
070:            public class GradeRow implements  Serializable {
071:                private GradeMapping gradeMapping;
072:                private String grade;
073:                private boolean editable;
074:
075:                public GradeRow() {
076:                }
077:
078:                public GradeRow(GradeMapping gradeMapping, String grade,
079:                        boolean editable) {
080:                    this .gradeMapping = gradeMapping;
081:                    this .grade = grade;
082:                    this .editable = editable;
083:                }
084:
085:                public String getGrade() {
086:                    return grade;
087:                }
088:
089:                public Double getMappingValue() {
090:                    return (Double) gradeMapping.getGradeMap().get(grade);
091:                }
092:
093:                public void setMappingValue(Double value) {
094:                    gradeMapping.getGradeMap().put(grade, value);
095:                }
096:
097:                public boolean isGradeEditable() {
098:                    return editable;
099:                }
100:            }
101:
102:            public Gradebook getLocalGradebook() {
103:                return localGradebook;
104:            }
105:
106:            /**
107:             * Initializes this backing bean.
108:             */
109:            protected void init() {
110:                if (!workInProgress) {
111:                    localGradebook = getGradebookManager()
112:                            .getGradebookWithGradeMappings(getGradebookId());
113:
114:                    // Load the grade mappings, sorted by name.
115:                    List gradeMappings = new ArrayList(localGradebook
116:                            .getGradeMappings());
117:                    Collections.sort(gradeMappings);
118:
119:                    // Create the grade type drop-down menu
120:                    gradeMappingsSelectItems = new ArrayList(gradeMappings
121:                            .size());
122:                    for (Iterator iter = gradeMappings.iterator(); iter
123:                            .hasNext();) {
124:                        GradeMapping gradeMapping = (GradeMapping) iter.next();
125:                        gradeMappingsSelectItems.add(new SelectItem(
126:                                gradeMapping.getId(), gradeMapping.getName()));
127:                    }
128:                    // set the selected grade mapping
129:                    GradeMapping selectedGradeMapping = localGradebook
130:                            .getSelectedGradeMapping();
131:                    selectedGradeMappingId = selectedGradeMapping.getId();
132:                    initGradeRows();
133:                }
134:
135:                // Set the view state.
136:                workInProgress = true;
137:            }
138:
139:            private void initGradeRows() {
140:                // Set up UI table view.
141:                gradeRows = new ArrayList();
142:                GradeMapping selectedGradeMapping = localGradebook
143:                        .getSelectedGradeMapping();
144:                for (Iterator iter = selectedGradeMapping.getGrades()
145:                        .iterator(); iter.hasNext();) {
146:                    String grade = (String) iter.next();
147:
148:                    // Bottom grades (with a lower bound of 0%) and manual-only
149:                    // grades (which have no percentage equivalent) are not
150:                    // editable.
151:                    Double d = selectedGradeMapping.getDefaultBottomPercents()
152:                            .get(grade);
153:                    boolean editable = ((d != null) && (d.doubleValue() > 0.0));
154:                    gradeRows.add(new GradeRow(selectedGradeMapping, grade,
155:                            editable));
156:                }
157:            }
158:
159:            public List getGradeRows() {
160:                return gradeRows;
161:            }
162:
163:            public void setGradeRows(List gradeRows) {
164:                this .gradeRows = gradeRows;
165:            }
166:
167:            /**
168:             * Action listener to view a different grade type mapping.
169:             * According to the specification, we do not update any changed values in the currently
170:             * shown mapping, but we do remember them.
171:             */
172:            public void changeGradeType(ActionEvent event) {
173:                for (Iterator iter = localGradebook.getGradeMappings()
174:                        .iterator(); iter.hasNext();) {
175:                    GradeMapping mapping = (GradeMapping) iter.next();
176:                    if (mapping.getId().equals(selectedGradeMappingId)) {
177:                        localGradebook.setSelectedGradeMapping(mapping);
178:                        initGradeRows();
179:                    }
180:                }
181:            }
182:
183:            /**
184:             * Action listener to reset the currently selected grade mapping to its default values.
185:             * Other, not currently visible, changed unsaved grade mapping settings are left as they
186:             * are.
187:             */
188:            public void resetMappingValues(ActionEvent event) {
189:                localGradebook.getSelectedGradeMapping().setDefaultValues();
190:            }
191:
192:            /**
193:             * Updates the gradebook to reflect the currently selected grade type and mapping.
194:             */
195:            public String save() {
196:                if (!isMappingValid(localGradebook.getSelectedGradeMapping())) {
197:                    return null;
198:                }
199:
200:                try {
201:                    getGradebookManager().updateGradebook(localGradebook);
202:                    FacesUtil
203:                            .addRedirectSafeMessage(getLocalizedString("feedback_options_submit_success"));
204:                } catch (IllegalStateException ise) {
205:                    FacesUtil.addErrorMessage(getLocalizedString(
206:                            "feedback_options_illegal_change",
207:                            new String[] { localGradebook
208:                                    .getSelectedGradeMapping().getName() }));
209:                    return null;
210:                } catch (StaleObjectModificationException e) {
211:                    log.error(e);
212:                    FacesUtil
213:                            .addErrorMessage(getLocalizedString("feedback_options_locking_failure"));
214:                    return null;
215:                }
216:
217:                return "overview";
218:            }
219:
220:            private boolean isMappingValid(GradeMapping gradeMapping) {
221:                boolean valid = true;
222:                Double previousPercentage = null;
223:                for (Iterator iter = gradeMapping.getGrades().iterator(); iter
224:                        .hasNext();) {
225:                    String grade = (String) iter.next();
226:                    Double percentage = (Double) gradeMapping.getValue(grade);
227:                    if (log.isDebugEnabled())
228:                        log.debug("checking percentage " + percentage
229:                                + " for validity");
230:
231:                    // Grades that are percentage-based need to remain percentage-based,
232:                    // be in descending order, and end with 0.
233:                    // Manual-only grades (which aren't associated with a percentage) always
234:                    // follow the lowest percentage-based grade, and must stay manual-only.
235:                    boolean manualOnly = (gradeMapping
236:                            .getDefaultBottomPercents().get(grade) == null);
237:
238:                    if (manualOnly) {
239:                        if (percentage != null) {
240:                            // This shouldn't happen, given the UI.
241:                            if (log.isErrorEnabled())
242:                                log
243:                                        .error("User "
244:                                                + getUserUid()
245:                                                + " attempted to set manual-only grade '"
246:                                                + grade + "' to be worth "
247:                                                + percentage + " percent");
248:                            percentage = null;
249:                            valid = false;
250:                        }
251:                    } else {
252:                        if (percentage == null) {
253:                            FacesUtil
254:                                    .addUniqueErrorMessage(getLocalizedString("feedback_options_require_all_values"));
255:                            valid = false;
256:                        } else if (percentage.doubleValue() < 0) {
257:                            FacesUtil
258:                                    .addUniqueErrorMessage(getLocalizedString("feedback_options_require_positive"));
259:                            valid = false;
260:                        } else if ((previousPercentage != null)
261:                                && (previousPercentage.doubleValue() < percentage
262:                                        .doubleValue())) {
263:                            FacesUtil
264:                                    .addUniqueErrorMessage(getLocalizedString("feedback_options_require_descending_order"));
265:                            valid = false;
266:                        }
267:                    }
268:                    previousPercentage = percentage;
269:                }
270:                return valid;
271:            }
272:
273:            public String cancel() {
274:                // Just in case we change the navigation to stay on this page,
275:                // clear the work-in-progress indicator so that the user can
276:                // start fresh.
277:                workInProgress = false;
278:
279:                return "overview";
280:            }
281:
282:            public List getGradeMappingsSelectItems() {
283:                return gradeMappingsSelectItems;
284:            }
285:
286:            public void setGradeMappingsSelectItems(
287:                    List gradeMappingsSelectItems) {
288:                this .gradeMappingsSelectItems = gradeMappingsSelectItems;
289:            }
290:
291:            public Long getSelectedGradeMappingId() {
292:                return selectedGradeMappingId;
293:            }
294:
295:            public void setSelectedGradeMappingId(Long selectedGradeMappingId) {
296:                this.selectedGradeMappingId = selectedGradeMappingId;
297:            }
298:        }
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