public void DoTheWork()
{
var productList = new List <IProduct>
{
new Product("red", "1"),
new Product("blue", "1"),
new Product("white", "1"),
new Product("red", "2"),
new Product("viola", "3"),
new Product("black", "3"),
new Product("red", "4"),
new Product("brown", "4")
};
var filter = new ProductFilter();
var filterByClor = filter.Apply(productList, new ColorSpecification("red"));
var filterdBySize = filter.Apply(productList, new SizeSpecification("2"));
}
static void Main(string[] args)
{
var apple = new Product("Apple", Color.Green, Size.Small);
var tree = new Product("Tree", Color.Green, Size.Large);
var house = new Product("House", Color.Blue, Size.Large);
Product[] products = { apple, tree, house };
var pf = new ProductFilter();
Console.WriteLine("Green products (old):");
foreach (var p in pf.FilterByColor(products, Color.Green))
{
Console.WriteLine($" - {p.Name} is green");
}
// ^^ BEFORE
// vv AFTER
var bf = new BetterFilter();
Console.WriteLine("Green products (new):");
foreach (var p in bf.Filter(products, new ColorSpecification(Color.Green)))
{
Console.WriteLine($" - {p.Name} is green");
}
Console.WriteLine("Large products");
foreach (var p in bf.Filter(products, new SizeSpecification(Size.Large)))
{
Console.WriteLine($" - {p.Name} is large");
}
Console.WriteLine("Large blue items");
foreach (var p in bf.Filter(products,
new AndSpecification <Product>(new ColorSpecification(Color.Blue), new SizeSpecification(Size.Large)))
)
{
Console.WriteLine($" - {p.Name} is big and blue");
}
}
static void Main(string[] args)
{
Product[] products = new Product[]
{
new Product("Apple", Color.Green, Size.Small),
new Product("Tree", Color.Green, Size.Huge),
new Product("House", Color.Blue, Size.Huge)
};
var pf = new ProductFilter();
foreach (var p in pf.FilterByColor(products, Color.Green))
{
Console.WriteLine($" - {p.Name} is green");
}
var bf = new BetterFilter();
foreach (var p in bf.Filter(products, new ColorSpecificaiton(Color.Green)))
{
Console.WriteLine($" - {p.Name} is green");
}
var bf2 = new BetterFilter();
foreach (var p in bf2.Filter(products,
new AndSpecification <Product>(new ColorSpecificaiton(Color.Green), new SizeSpecification(Size.Huge))))
{
Console.WriteLine($" - {p.Name} is green and huge");
}
Console.ReadKey();
// Go to http://aka.ms/dotnet-get-started-console to continue learning how to build a console app!
}
/// <summary>
/// "Software entities (classes, modules, functions, etc.)
/// should be open for extension, but closed for modification"
///
/// Extend ProductFilter without changing it by using inheritance.
/// </summary>
static void Main(string[] args)
{
var apple = new Product("Apple", Color.Green, Size.Small);
var tree = new Product("Tree", Color.Green, Size.Large);
var house = new Product("House", Color.Blue, Size.Large);
Product[] products = { apple, tree, house };
var productFilter = new ProductFilter();
Console.WriteLine("Green products:");
foreach (var product in productFilter.Filter(products, new ColorSpecification(Color.Green)))
{
Console.WriteLine($" - {product.Name} is green");
}
Console.WriteLine("Large blue items:");
foreach (var product in productFilter.Filter(products,
new AndSpecification <Product>(
new ColorSpecification(Color.Blue), new SizeSpecification(Size.Large))))
{
Console.WriteLine($" - {product.Name} is blue and large");
}
}
