/* * Copyright 2006 Google Inc. *  * 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 com.google.gwt.sample.dynatable.server;import com.google.gwt.sample.dynatable.client.Person;import com.google.gwt.sample.dynatable.client.Professor;import com.google.gwt.sample.dynatable.client.Schedule;import com.google.gwt.sample.dynatable.client.SchoolCalendarService;import com.google.gwt.sample.dynatable.client.Student;import com.google.gwt.sample.dynatable.client.TimeSlot;import com.google.gwt.user.server.rpc.RemoteServiceServlet;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.Random;/** * The implemenation of the RPC service which runs on the server. */public class SchoolCalendarServiceImpl extends RemoteServiceServlet implements    SchoolCalendarService {  private static final String[] FIRST_NAMES = new String[] {      "Inman", "Sally", "Omar", "Teddy", "Jimmy", "Cathy", "Barney", "Fred",      "Eddie", "Carlos"};  private static final String[] LAST_NAMES = new String[] {      "Smith", "Jones", "Epps", "Gibbs", "Webber", "Blum", "Mendez",      "Crutcher", "Needler", "Wilson", "Chase", "Edelstein"};  private static final String[] SUBJECTS = new String[] {      "Chemistry", "Phrenology", "Geometry", "Underwater Basket Weaving",      "Basketball", "Computer Science", "Statistics", "Materials Engineering",      "English Literature", "Geology"};  private static final Person[] NO_PEOPLE = new Person[0];  private static final int CLASS_LENGTH_MINS = 50;  private static final int MAX_SCHED_ENTRIES = 5;  private static final int MIN_SCHED_ENTRIES = 1;  private static final int MAX_PEOPLE = 100;  private static final int STUDENTS_PER_PROF = 5;  private final List people = new ArrayList();  private final Random rnd = new Random(3);  public SchoolCalendarServiceImpl() {    generateRandomPeople();  }  public Person[] getPeople(int startIndex, int maxCount) {    int peopleCount = people.size();    int start = startIndex;    if (start >= peopleCount) {      return NO_PEOPLE;    }    int end = Math.min(startIndex + maxCount, peopleCount);    if (start == end) {      return NO_PEOPLE;    }    int resultCount = end - start;    Person[] results = new Person[resultCount];    for (int from = start, to = 0; to < resultCount; ++from, ++to) {      results[to] = (Person) people.get(from);    }    return results;  }  /**   * Write the serialized response out to stdout. This is a very unusual thing   * to do, but it allows us to create a static file version of the response   * without deploying a servlet.   */  protected void onAfterResponseSerialized(String serializedResponse) {    System.out.println(serializedResponse);  }  private void generateRandomPeople() {    for (int i = 0; i < MAX_PEOPLE; ++i) {      Person person = generateRandomPerson();      people.add(person);    }  }  private Person generateRandomPerson() {    // 1 out of every so many people is a prof.    //    if (rnd.nextInt(STUDENTS_PER_PROF) == 1) {      return generateRandomProfessor();    } else {      return generateRandomStudent();    }  }  private Person generateRandomProfessor() {    Professor prof = new Professor();    String firstName = pickRandomString(FIRST_NAMES);    String lastName = pickRandomString(LAST_NAMES);    prof.setName("Dr. " + firstName + " " + lastName);    String subject = pickRandomString(SUBJECTS);    prof.setDescription("Professor of " + subject);    generateRandomSchedule(prof.getTeachingSchedule());    return prof;  }  private void generateRandomSchedule(Schedule sched) {    int range = MAX_SCHED_ENTRIES - MIN_SCHED_ENTRIES + 1;    int howMany = MIN_SCHED_ENTRIES + rnd.nextInt(range);    TimeSlot[] timeSlots = new TimeSlot[howMany];    for (int i = 0; i < howMany; ++i) {      int startHrs = 8 + rnd.nextInt(9); // 8 am - 5 pm      int startMins = 15 * rnd.nextInt(4); // on the hour or some quarter      int dayOfWeek = 1 + rnd.nextInt(5); // Mon - Fri      int absStartMins = 60 * startHrs + startMins; // convert to minutes      int absStopMins = absStartMins + CLASS_LENGTH_MINS;      timeSlots[i] = new TimeSlot(dayOfWeek, absStartMins, absStopMins);    }    Arrays.sort(timeSlots);    for (int i = 0; i < howMany; ++i) {      sched.addTimeSlot(timeSlots[i]);    }  }  private Person generateRandomStudent() {    Student student = new Student();    String firstName = pickRandomString(FIRST_NAMES);    String lastName = pickRandomString(LAST_NAMES);    student.setName(firstName + " " + lastName);    String subject = pickRandomString(SUBJECTS);    student.setDescription("Majoring in " + subject);    generateRandomSchedule(student.getClassSchedule());    return student;  }  private String pickRandomString(String[] a) {    int i = rnd.nextInt(a.length);    return a[i];  }}