|
1
16 package com.google.gwt.sample.dynatable.server;
17
18 import com.google.gwt.sample.dynatable.client.Person;
19 import com.google.gwt.sample.dynatable.client.Professor;
20 import com.google.gwt.sample.dynatable.client.Schedule;
21 import com.google.gwt.sample.dynatable.client.SchoolCalendarService;
22 import com.google.gwt.sample.dynatable.client.Student;
23 import com.google.gwt.sample.dynatable.client.TimeSlot;
24 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
25
26 import java.util.ArrayList  ;
27 import java.util.Arrays ;
28 import java.util.List ;
29 import java.util.Random ;
30
31
34 public class SchoolCalendarServiceImpl extends RemoteServiceServlet implements
35 SchoolCalendarService {
36
37 private static final String [] FIRST_NAMES = new String [] {
38 "Inman", "Sally", "Omar", "Teddy", "Jimmy", "Cathy", "Barney", "Fred",
39 "Eddie", "Carlos"};
40
41 private static final String [] LAST_NAMES = new String [] {
42 "Smith", "Jones", "Epps", "Gibbs", "Webber", "Blum", "Mendez",
43 "Crutcher", "Needler", "Wilson", "Chase", "Edelstein"};
44
45 private static final String [] SUBJECTS = new String [] {
46 "Chemistry", "Phrenology", "Geometry", "Underwater Basket Weaving",
47 "Basketball", "Computer Science", "Statistics", "Materials Engineering",
48 "English Literature", "Geology"};
49
50 private static final Person[] NO_PEOPLE = new Person[0];
51
52 private static final int CLASS_LENGTH_MINS = 50;
53
54 private static final int MAX_SCHED_ENTRIES = 5;
55
56 private static final int MIN_SCHED_ENTRIES = 1;
57
58 private static final int MAX_PEOPLE = 100;
59
60 private static final int STUDENTS_PER_PROF = 5;
61
62 private final List people = new ArrayList ();
63
64 private final Random rnd = new Random (3);
65
66 public SchoolCalendarServiceImpl() {
67 generateRandomPeople();
68 }
69
70 public Person[] getPeople(int startIndex, int maxCount) {
71 int peopleCount = people.size();
72
73 int start = startIndex;
74 if (start >= peopleCount) {
75 return NO_PEOPLE;
76 }
77
78 int end = Math.min(startIndex + maxCount, peopleCount);
79 if (start == end) {
80 return NO_PEOPLE;
81 }
82
83 int resultCount = end - start;
84 Person[] results = new Person[resultCount];
85 for (int from = start, to = 0; to < resultCount; ++from, ++to) {
86 results[to] = (Person) people.get(from);
87 }
88
89 return results;
90 }
91
92
97 protected void onAfterResponseSerialized(String serializedResponse) {
98 System.out.println(serializedResponse);
99 }
100
101 private void generateRandomPeople() {
102 for (int i = 0; i < MAX_PEOPLE; ++i) {
103 Person person = generateRandomPerson();
104 people.add(person);
105 }
106 }
107
108 private Person generateRandomPerson() {
109 if (rnd.nextInt(STUDENTS_PER_PROF) == 1) {
112 return generateRandomProfessor();
113 } else {
114 return generateRandomStudent();
115 }
116 }
117
118 private Person generateRandomProfessor() {
119 Professor prof = new Professor();
120
121 String firstName = pickRandomString(FIRST_NAMES);
122 String lastName = pickRandomString(LAST_NAMES);
123 prof.setName("Dr. " + firstName + " " + lastName);
124
125 String subject = pickRandomString(SUBJECTS);
126 prof.setDescription("Professor of " + subject);
127
128 generateRandomSchedule(prof.getTeachingSchedule());
129
130 return prof;
131 }
132
133 private void generateRandomSchedule(Schedule sched) {
134 int range = MAX_SCHED_ENTRIES - MIN_SCHED_ENTRIES + 1;
135 int howMany = MIN_SCHED_ENTRIES + rnd.nextInt(range);
136
137 TimeSlot[] timeSlots = new TimeSlot[howMany];
138
139 for (int i = 0; i < howMany; ++i) {
140 int startHrs = 8 + rnd.nextInt(9); int startMins = 15 * rnd.nextInt(4); int dayOfWeek = 1 + rnd.nextInt(5);
144 int absStartMins = 60 * startHrs + startMins; int absStopMins = absStartMins + CLASS_LENGTH_MINS;
146
147 timeSlots[i] = new TimeSlot(dayOfWeek, absStartMins, absStopMins);
148 }
149
150 Arrays.sort(timeSlots);
151
152 for (int i = 0; i < howMany; ++i) {
153 sched.addTimeSlot(timeSlots[i]);
154 }
155 }
156
157 private Person generateRandomStudent() {
158 Student student = new Student();
159
160 String firstName = pickRandomString(FIRST_NAMES);
161 String lastName = pickRandomString(LAST_NAMES);
162 student.setName(firstName + " " + lastName);
163
164 String subject = pickRandomString(SUBJECTS);
165 student.setDescription("Majoring in " + subject);
166
167 generateRandomSchedule(student.getClassSchedule());
168
169 return student;
170 }
171
172 private String pickRandomString(String [] a) {
173 int i = rnd.nextInt(a.length);
174 return a[i];
175 }
176 }
177 |
Popular Tags |
Java API By Example, From Geeks To Geeks.