// Bridge pattern -- Real World example
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using System;
using System.Collections; namespace DoFactory.GangOfFour.Bridge.RealWorld { // MainApp test application class MainApp { static void Main() { // Create RefinedAbstraction Customers customers = new Customers("Chicago"); // Set ConcreteImplementor customers.Data = new CustomersData(); // Exercise the bridge customers.Show(); customers.Next(); customers.Show(); customers.Next(); customers.Show(); customers.New("Henry Velasquez"); customers.ShowAll(); // Wait for user Console.Read(); } } // "Abstraction" class CustomersBase { private DataObject dataObject; protected string group; public CustomersBase(string group) { this.group = group; } // Property public DataObject Data { set{ dataObject = value; } get{ return dataObject; } } public virtual void Next() { dataObject.NextRecord(); } public virtual void Prior() { dataObject.PriorRecord(); } public virtual void New(string name) { dataObject.NewRecord(name); } public virtual void Delete(string name) { dataObject.DeleteRecord(name); } public virtual void Show() { dataObject.ShowRecord(); } public virtual void ShowAll() { Console.WriteLine("Customer Group: " + group); dataObject.ShowAllRecords(); } } // "RefinedAbstraction" class Customers : CustomersBase { // Constructor public Customers(string group) : base(group) { } public override void ShowAll() { // Add separator lines Console.WriteLine(); Console.WriteLine ("------------------------"); base.ShowAll(); Console.WriteLine ("------------------------"); } } // "Implementor" abstract class DataObject { public abstract void NextRecord(); public abstract void PriorRecord(); public abstract void NewRecord(string name); public abstract void DeleteRecord(string name); public abstract void ShowRecord(); public abstract void ShowAllRecords(); } // "ConcreteImplementor" class CustomersData : DataObject { private ArrayList customers = new ArrayList(); private int current = 0; public CustomersData() { // Loaded from a database customers.Add("Jim Jones"); customers.Add("Samual Jackson"); customers.Add("Allen Good"); customers.Add("Ann Stills"); customers.Add("Lisa Giolani"); } public override void NextRecord() { if (current <= customers.Count - 1) { current++; } } public override void PriorRecord() { if (current > 0) { current--; } } public override void NewRecord(string name) { customers.Add(name); } public override void DeleteRecord(string name) { customers.Remove(name); } public override void ShowRecord() { Console.WriteLine(customers[current]); } public override void ShowAllRecords() { foreach (string name in customers) { Console.WriteLine(" " + name); } } } } |
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