Java tutorial
/* * Copyright 2010 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 fr.drop.shared; import com.google.gwt.core.client.GWT; import com.google.gwt.i18n.client.Constants; import com.google.gwt.user.client.Random; import com.google.gwt.view.client.HasData; import com.google.gwt.view.client.ListDataProvider; import com.google.gwt.view.client.ProvidesKey; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; /** * The data source for contact information used in the sample. */ public class UserDatabase { /** * A contact category. */ public static class UserCategory { private final String displayName; private UserCategory(String displayName) { this.displayName = displayName; } public String getDisplayName() { return displayName; } } /** * The constants used in this Content Widget. */ static interface DatabaseConstants extends Constants { String[] contactDatabaseCategories(); } private static final String[] FEMALE_FIRST_NAMES = { "Mary", "Patricia", "Linda", "Barbara", "Elizabeth", "Jennifer", "Maria", "Susan", "Margaret", "Dorothy", "Lisa", "Nancy", "Karen", "Betty", "Helen", "Sandra", "Donna", "Carol", "Ruth", "Sharon", "Michelle", "Laura", "Sarah", "Kimberly", "Deborah", "Jessica", "Shirley", "Cynthia", "Angela", "Melissa", "Brenda", "Amy", "Anna", "Rebecca", "Virginia", "Kathleen", "Pamela", "Martha", "Debra", "Amanda", "Stephanie", "Carolyn", "Christine", "Marie", "Janet", "Catherine", "Frances", "Ann", "Joyce", "Diane", "Alice", "Julie", "Heather", "Teresa", "Doris", "Gloria", "Evelyn", "Jean", "Cheryl", "Mildred", "Katherine", "Joan", "Ashley", "Judith", "Rose", "Janice", "Kelly", "Nicole", "Judy", "Christina", "Kathy", "Theresa", "Beverly", "Denise", "Tammy", "Irene", "Jane", "Lori", "Rachel", "Marilyn", "Andrea", "Kathryn", "Louise", "Sara", "Anne", "Jacqueline", "Wanda", "Bonnie", "Julia", "Ruby", "Lois", "Tina", "Phyllis", "Norma", "Paula", "Diana", "Annie", "Lillian", "Emily", "Robin", "Peggy", "Crystal", "Gladys", "Rita", "Dawn", "Connie", "Florence", "Tracy", "Edna", "Tiffany", "Carmen", "Rosa", "Cindy", "Grace", "Wendy", "Victoria", "Edith", "Kim", "Sherry", "Sylvia", "Josephine", "Thelma", "Shannon", "Sheila", "Ethel", "Ellen", "Elaine", "Marjorie", "Carrie", "Charlotte", "Monica", "Esther", "Pauline", "Emma", "Juanita", "Anita", "Rhonda", "Hazel", "Amber", "Eva", "Debbie", "April", "Leslie", "Clara", "Lucille", "Jamie", "Joanne", "Eleanor", "Valerie", "Danielle", "Megan", "Alicia", "Suzanne", "Michele", "Gail", "Bertha", "Darlene", "Veronica", "Jill", "Erin", "Geraldine", "Lauren", "Cathy", "Joann", "Lorraine", "Lynn", "Sally", "Regina", "Erica", "Beatrice", "Dolores", "Bernice", "Audrey", "Yvonne", "Annette", "June", "Samantha", "Marion", "Dana", "Stacy", "Ana", "Renee", "Ida", "Vivian", "Roberta", "Holly", "Brittany", "Melanie", "Loretta", "Yolanda", "Jeanette", "Laurie", "Katie", "Kristen", "Vanessa", "Alma", "Sue", "Elsie", "Beth", "Jeanne" }; private static final String[] MALE_FIRST_NAMES = { "James", "John", "Robert", "Michael", "William", "David", "Richard", "Charles", "Joseph", "Thomas", "Christopher", "Daniel", "Paul", "Mark", "Donald", "George", "Kenneth", "Steven", "Edward", "Brian", "Ronald", "Anthony", "Kevin", "Jason", "Matthew", "Gary", "Timothy", "Jose", "Larry", "Jeffrey", "Frank", "Scott", "Eric", "Stephen", "Andrew", "Raymond", "Gregory", "Joshua", "Jerry", "Dennis", "Walter", "Patrick", "Peter", "Harold", "Douglas", "Henry", "Carl", "Arthur", "Ryan", "Roger", "Joe", "Juan", "Jack", "Albert", "Jonathan", "Justin", "Terry", "Gerald", "Keith", "Samuel", "Willie", "Ralph", "Lawrence", "Nicholas", "Roy", "Benjamin", "Bruce", "Brandon", "Adam", "Harry", "Fred", "Wayne", "Billy", "Steve", "Louis", "Jeremy", "Aaron", "Randy", "Howard", "Eugene", "Carlos", "Russell", "Bobby", "Victor", "Martin", "Ernest", "Phillip", "Todd", "Jesse", "Craig", "Alan", "Shawn", "Clarence", "Sean", "Philip", "Chris", "Johnny", "Earl", "Jimmy", "Antonio", "Danny", "Bryan", "Tony", "Luis", "Mike", "Stanley", "Leonard", "Nathan", "Dale", "Manuel", "Rodney", "Curtis", "Norman", "Allen", "Marvin", "Vincent", "Glenn", "Jeffery", "Travis", "Jeff", "Chad", "Jacob", "Lee", "Melvin", "Alfred", "Kyle", "Francis", "Bradley", "Jesus", "Herbert", "Frederick", "Ray", "Joel", "Edwin", "Don", "Eddie", "Ricky", "Troy", "Randall", "Barry", "Alexander", "Bernard", "Mario", "Leroy", "Francisco", "Marcus", "Micheal", "Theodore", "Clifford", "Miguel", "Oscar", "Jay", "Jim", "Tom", "Calvin", "Alex", "Jon", "Ronnie", "Bill", "Lloyd", "Tommy", "Leon", "Derek", "Warren", "Darrell", "Jerome", "Floyd", "Leo", "Alvin", "Tim", "Wesley", "Gordon", "Dean", "Greg", "Jorge", "Dustin", "Pedro", "Derrick", "Dan", "Lewis", "Zachary", "Corey", "Herman", "Maurice", "Vernon", "Roberto", "Clyde", "Glen", "Hector", "Shane", "Ricardo", "Sam", "Rick", "Lester", "Brent", "Ramon", "Charlie", "Tyler", "Gilbert", "Gene" }; private static final String[] LAST_NAMES = { "Smith", "Johnson", "Williams", "Jones", "Brown", "Davis", "Miller", "Wilson", "Moore", "Taylor", "Anderson", "Thomas", "Jackson", "White", "Harris", "Martin", "Thompson", "Garcia", "Martinez", "Robinson", "Clark", "Rodriguez", "Lewis", "Lee", "Walker", "Hall", "Allen", "Young", "Hernandez", "King", "Wright", "Lopez", "Hill", "Scott", "Green", "Adams", "Baker", "Gonzalez", "Nelson", "Carter", "Mitchell", "Perez", "Roberts", "Turner", "Phillips", "Campbell", "Parker", "Evans", "Edwards", "Collins", "Stewart", "Sanchez", "Morris", "Rogers", "Reed", "Cook", "Morgan", "Bell", "Murphy", "Bailey", "Rivera", "Cooper", "Richardson", "Cox", "Howard", "Ward", "Torres", "Peterson", "Gray", "Ramirez", "James", "Watson", "Brooks", "Kelly", "Sanders", "Price", "Bennett", "Wood", "Barnes", "Ross", "Henderson", "Coleman", "Jenkins", "Perry", "Powell", "Long", "Patterson", "Hughes", "Flores", "Washington", "Butler", "Simmons", "Foster", "Gonzales", "Bryant", "Alexander", "Russell", "Griffin", "Diaz", "Hayes", "Myers", "Ford", "Hamilton", "Graham", "Sullivan", "Wallace", "Woods", "Cole", "West", "Jordan", "Owens", "Reynolds", "Fisher", "Ellis", "Harrison", "Gibson", "Mcdonald", "Cruz", "Marshall", "Ortiz", "Gomez", "Murray", "Freeman", "Wells", "Webb", "Simpson", "Stevens", "Tucker", "Porter", "Hunter", "Hicks", "Crawford", "Henry", "Boyd", "Mason", "Morales", "Kennedy", "Warren", "Dixon", "Ramos", "Reyes", "Burns", "Gordon", "Shaw", "Holmes", "Rice", "Robertson", "Hunt", "Black", "Daniels", "Palmer", "Mills", "Nichols", "Grant", "Knight", "Ferguson", "Rose", "Stone", "Hawkins", "Dunn", "Perkins", "Hudson", "Spencer", "Gardner", "Stephens", "Payne", "Pierce", "Berry", "Matthews", "Arnold", "Wagner", "Willis", "Ray", "Watkins", "Olson", "Carroll", "Duncan", "Snyder", "Hart", "Cunningham", "Bradley", "Lane", "Andrews", "Ruiz", "Harper", "Fox", "Riley", "Armstrong", "Carpenter", "Weaver", "Greene", "Lawrence", "Elliott", "Chavez", "Sims", "Austin", "Peters", "Kelley", "Franklin", "Lawson" }; private static final String[] STREET_NAMES = { "Peachtree", "First", "Second", "Third", "Fourth", "Fifth", "Sixth", "Tenth", "Fourteenth", "Spring", "Techwood", "West Peachtree", "Juniper", "Cypress", "Fowler", "Piedmont", "Juniper", "Main", "Central", "Currier", "Courtland", "Williams", "Centennial", "Olympic", "Baker", "Highland", "Pryor", "Decatur", "Bell", "Edgewood", "Mitchell", "Forsyth", "Capital" }; private static final String[] STREET_SUFFIX = { "St", "Rd", "Ln", "Blvd", "Way", "Pkwy", "Cir", "Ave" }; /** * The singleton instance of the database. */ private static UserDatabase instance; /** * Get the singleton instance of the contact database. * * @return the singleton instance */ public static UserDatabase get() { if (instance == null) { instance = new UserDatabase(); } return instance; } /** * The provider that holds the list of contacts in the database. */ private ListDataProvider<DropUser> dataProvider = new ListDataProvider<DropUser>(); private final UserCategory[] categories; /** * The map of contacts to her friends. */ private final Map<Integer, Set<DropUser>> friendsMap = new HashMap<Integer, Set<DropUser>>(); /** * Construct a new contact database. */ private UserDatabase() { // Initialize the categories. DatabaseConstants constants = GWT.create(DatabaseConstants.class); String[] catNames = constants.contactDatabaseCategories(); categories = new UserCategory[catNames.length]; for (int i = 0; i < catNames.length; i++) { categories[i] = new UserCategory(catNames[i]); } // Generate initial data. generateContacts(250); } /** * Add a new contact. * * @param contact the contact to add. */ public void addContact(DropUser contact) { List<DropUser> contacts = dataProvider.getList(); // Remove the contact first so we don't add a duplicate. contacts.remove(contact); contacts.add(contact); } /** * Add a display to the database. The current range of interest of the display * will be populated with data. * * @param display a {@Link HasData}. */ public void addDataDisplay(HasData<DropUser> display) { dataProvider.addDataDisplay(display); } /** * Generate the specified number of contacts and add them to the data * provider. * * @param count the number of contacts to generate. */ public void generateContacts(int count) { List<DropUser> contacts = dataProvider.getList(); for (int i = 0; i < count; i++) { contacts.add(createContactInfo()); } } public ListDataProvider<DropUser> getDataProvider() { return dataProvider; } /** * Get the categories in the database. * * @return the categories in the database */ public UserCategory[] queryCategories() { return categories; } /** * Query all contacts for the specified category that begin with the specified * first name prefix. * * @param category the category * @param firstNamePrefix the prefix of the first name * @return the list of contacts in the category */ public List<DropUser> queryContactsByCategoryAndFirstName(UserCategory category, String firstNamePrefix) { List<DropUser> matches = new ArrayList<DropUser>(); for (DropUser contact : dataProvider.getList()) { if (/*contact.getCategory() == category &&*/ contact.getFirstName().startsWith(firstNamePrefix)) { matches.add(contact); } } return matches; } /** * Query the list of friends for the specified contact. * * @param contact the contact * @return the friends of the contact */ public Set<DropUser> queryFriends(DropUser contact) { Set<DropUser> friends = friendsMap.get(contact.getId()); if (friends == null) { // Assign some random friends. friends = new HashSet<DropUser>(); int numContacts = dataProvider.getList().size(); int friendCount = 2 + Random.nextInt(8); for (int i = 0; i < friendCount; i++) { friends.add(dataProvider.getList().get(Random.nextInt(numContacts))); } friendsMap.put(contact.getId(), friends); } return friends; } /** * Refresh all displays. */ public void refreshDisplays() { dataProvider.refresh(); } /** * Create a new random {@link DropUser}. * * @return the new {@link DropUser}. */ @SuppressWarnings("deprecation") private DropUser createContactInfo() { DropUser contact = new DropUser(); contact.setLastName(nextValue(LAST_NAMES)); if (Random.nextBoolean()) { // Male. contact.setFirstName(nextValue(MALE_FIRST_NAMES)); } else { // Female. contact.setFirstName(nextValue(FEMALE_FIRST_NAMES)); } // Create a birthday between 20-80 years ago. int year = (new Date()).getYear() - 21 - Random.nextInt(61); contact.setBirthday(new Date(year, Random.nextInt(12), 1 + Random.nextInt(31))); // Create an address. int addrNum = 1 + Random.nextInt(999); String addrStreet = nextValue(STREET_NAMES); String addrSuffix = nextValue(STREET_SUFFIX); contact.setAddress(addrNum + " " + addrStreet + " " + addrSuffix); return contact; } /** * Get the next random value from an array. * * @param array the array * @return a random value in the array */ private <T> T nextValue(T[] array) { return array[Random.nextInt(array.length)]; } }