( Design Patterns ) Creational D
2016-12-07 本文已影响0人
乔什华
Definition
Separate the construction of a complex object from its representation so that the same construction process can create different representations, which allows for the step-by-step creation of complex objects using the correct sequence of action.
This pattern is used when a complex object that needs to be created is constructed by constituent parts that must be created in the same order or by using a specific algorithm.
Components
- Builder:Interface for creating the actual products. Each step is an abstract method.
- ConcreteBuilder:Implementation for builder.
- Director:represent class that controls algorithm used for creation of complex object.
- Product:complex object that is being built.
Code
public class DirectorCashier
{
public void BuildFood(Builder builder)
{
builder.BuildPart1();
builder.BuildPart2();
}
}
public abstract class Builder
{
public abstract void BuildPart1();
public abstract void BuildPart2();
public abstract Product GetProduct();
}
public class ConcreteBuilder1 : Builder
{
protected Product _product;
public ConcreteBuilder1()
{
_product = new Product();
}
public override void BuildPart1()
{
this._product.Add("Hamburger", "2");
}
public override void BuildPart2()
{
this._product.Add("Drink", "1");
}
public override Product GetProduct()
{
return this._product;
}
}
public class Product
{
public Dictionary<string, string> products = new Dictionary<string, string>();
public void Add(string name, string value)
{
products.Add(name, value);
}
public void ShowToClient()
{
foreach (var p in products)
{
Console.WriteLine($"{p.Key} {p.Value}");
}
}
}
public class BuilderPatternRunner : IPattterRunner
{
public void RunPattern()
{
var Builder1 = new ConcreteBuilder1();
var Director = new DirectorCashier();
Director.BuildFood(Builder1);
Builder1.GetProduct().ShowToClient();
}
}
Reference
Design Patterns 1 of 3 - Creational Design Patterns - CodeProject