Source code: com/sample/tutorial/update/database/Database.java

   /*
    * Database.java
    *
    * Copyright (c) 2001, 2002 Aendvari, Ltd. All Rights Reserved.
    *
    * See the file LICENSE for terms of use.
    *
    */
   
  package com.sample.tutorial.update.database;
  
  import java.util.ArrayList;
  
  /**
   * Simulates a database of contact records.
   *
   * @author  Trevor Milne
   *
   */
  
  public class Database
  {
    /** Single instance of database. */
    protected static Database singleton = new Database();
  
  
    /* Attributes */
  
  
    /** Contact records. */
    protected ArrayList contacts;
  
  
    /* Constructors */
  
  
    protected Database()
    {
      contacts = new ArrayList();
  
      contacts.add(new Contact(1, "first A", "last A", "email A"));
    }
  
  
    /* Operations */
  
  
    public Contact getContact(int contactId)
    {
      Contact result = new Contact();
      result.setData((Contact)contacts.get(contactId - 1));
  
      return result;
    }
  
    public void setContact(Contact contact)
    {
      Contact update = (Contact)contacts.get(contact.getId() - 1);
      update.setData(contact);
    }
  
  
    /* Singleton */
  
  
    public static Database getInstance()
    {
      return singleton;
    }
  }