C# 橋模式代碼

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// Bridge pattern -- Real World example
using System;
using System.Collections;
// "Abstraction"
class BusinessObject
{
　// Fields
　private DataObject dataObject;
　protected string group;
　// Constructors
　public BusinessObject( string group )
　{
　　this.group = group;
　}
　// Properties
　public DataObject DataObject
　{
　　set{ dataObject = value; }
　　get{ return dataObject; }
　}
　// Methods
　virtual public void Next()
　{ dataObject.NextRecord(); }
　virtual public void Prior()
　{ dataObject.PriorRecord(); }
　virtual public void New( string name )
　{ dataObject.NewRecord( name ); }
　virtual public void Delete( string name )
　{ dataObject.DeleteRecord( name ); }
　virtual public void Show()
　{ dataObject.ShowRecord(); }
　virtual public void ShowAll()
　{
　　Console.WriteLine( "Customer Group: {0}", group );
　　dataObject.ShowAllRecords();
　}
}
// "RefinedAbstraction"
class CustomersBusinessObject : BusinessObject
{
　// Constructors
　public CustomersBusinessObject( string group )
　　: base( group ){}
　// Methods
　override public void ShowAll()
　{
　　// Add separator lines
　　Console.WriteLine();
　　Console.WriteLine( "------------------------" );
　　base.ShowAll();
　　Console.WriteLine( "------------------------" );
　}
}
// "Implementor"
abstract class DataObject
{
　// Methods
　abstract public void NextRecord();
　abstract public void PriorRecord();
　abstract public void NewRecord( string name );
　abstract public void DeleteRecord( string name );
　abstract public void ShowRecord();
　abstract public void ShowAllRecords();
}
// "ConcreteImplementor"
class CustomersDataObject : DataObject
{
　// Fields
　private ArrayList customers = new ArrayList();
　private int current = 0;
　// Constructors
　public CustomersDataObject()
　{
　　// Loaded from a database
　　customers.Add( "Jim Jones" );
　　customers.Add( "Samual Jackson" );
　　customers.Add( "Allen Good" );
　　customers.Add( "Ann Stills" );
　　customers.Add( "Lisa Giolani" );
　}
　// Methods
　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 );
　}
}
/**////

/// Client test
///

public class BusinessApp
{
　public static void Main( string[] args )
　{
　　// Create RefinedAbstraction
　　CustomersBusinessObject customers =
　　　new CustomersBusinessObject(" Chicago ");
　　// Set ConcreteImplementor
　　customers.DataObject = new CustomersDataObject();
　　// Exercise the bridge
　　customers.Show();
　　customers.Next();
　　customers.Show();
　　customers.Next();
　　customers.Show();
　　customers.New( "Henry Velasquez" );
　　customers.ShowAll();
　}
}

 

 

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