public static void Main(string[] args)
{
//Bad approach
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 product in pf.FilterByColor(products, Color.Green))
{
Console.WriteLine($"-{product.Name} is green");
}
//Better approach
var bf = new BetterFilter();
Console.WriteLine("Green products (new):");
foreach (var product in bf.Filter(products, new ColorSpecification(Color.Green)))
{
Console.WriteLine($"-{product.Name} is green");
}
Console.WriteLine("Large blue items");
foreach (var product in bf.Filter(
products,
new AndSpecification <Product>(
new ColorSpecification(Color.Blue),
new SizeSpecification(Size.Large)
)
))
{
Console.WriteLine($" -{product.Name} is big and blue");
}
}
static void Main(string[] args)
{
var apple = new Product("Apple", Color.Green, Size.Small);
var tree = new Product("Tree", Color.Green, Size.Large);
var house = new Product("House", Color.Blue, Size.Large);
Product[] products = { apple, tree, house };
// Using bad example.
var pf = new ProductFilter();
Console.WriteLine("Green products (old): ");
foreach (var p in pf.FilterByColor(products, Color.Green))
{
Console.WriteLine($" - {p.Name} is green.");
}
// Using good example.
var bf = new BetterFilter();
Console.WriteLine("Green products (new):");
foreach (var p in bf.Filter(products, new ColorSpecification(Color.Green)))
{
Console.WriteLine($" - {p.Name} is green.");
}
// Another good example using color and size in filter.
Console.WriteLine("Large blue items:");
foreach (var p in bf.Filter(
products,
new AndSpecification <Product>(
new ColorSpecification(Color.Blue),
new SizeSpecification(Size.Large)
)))
{
Console.WriteLine($" - {p.Name} is big and blue");
}
}
