static void Main(string[] args)
{
List <Mobile> mobiles = new List <Mobile> {
new Mobile(Process.Type.Premium, 450),
new Mobile(Process.Type.Premium, 800),
new Mobile(Process.Type.Basic, 100),
new Mobile(Process.Type.Budget, 160),
new Mobile(Process.Type.Premium, 800),
new Mobile(Process.Type.Budget, 250),
new Mobile(Process.Type.Budget, 1)
};
ISpecification <Mobile> basicSpec = new Specification <Mobile>(o => o.Type == Process.Type.Basic);
ISpecification <Mobile> budgetSpec = new Specification <Mobile>(o => o.Type == Process.Type.Budget);
ISpecification <Mobile> premiumSpec = new Specification <Mobile>(o => (o.Type == Process.Type.Premium));
//premiumSpec = null; //Test
//To extract all mobile phones that costs less than 200
ISpecification <Mobile> budgetLowCostSpec = new Specification <Mobile>(o => o.Cost < 200 && o.Cost >= 100);
//budgetLowCostSpec = null; //test
//To extract all mobile phones that costs greater than or equal to 200
ISpecification <Mobile> budgetHighCostSpec = new Specification <Mobile>(o => (o.Cost >= 200));
//To extract all mobile phones that costs less than 500
ISpecification <Mobile> premiumLowCostSpec = new Specification <Mobile>(o => (o.Cost < 500));
//To extract all mobile phones that costs greater than or equal to 500
ISpecification <Mobile> premiumHighCostSpec = new Specification <Mobile>(o => (o.Cost >= 500));
var invProcess = new InventoryProcess <Mobile>();
IHandler <Mobile> seniorManager = new Approver <Mobile>("SeniorManager", invProcess.placeOrder);
IHandler <Mobile> manager = new Approver <Mobile>("Manager", invProcess.placeOrder);
IHandler <Mobile> supervisor = new Approver <Mobile>("Supervisor", invProcess.placeOrder);
IHandler <Mobile> employee = new Approver <Mobile>("Employee", invProcess.placeOrder);
employee.SetSpecification(basicSpec);
//For supervisor spec we combine the budget spec with budget low cost spec to achieve the constraint all budget mobiles that costs less than 200
//supervisor.SetSpecification(budgetSpec.And<Mobile>(budgetLowCostSpec));
supervisor.SetSpecification(basicSpec);
//For manager spec we combine the budget spec with budget high cost spec to achieve the constraint all budget mobiles that costs more than or equal to 200.
//For manager spec we combine the premium spec with premium low cost spec to achieve the constraint all premium mobiles that costs less than 500.
manager.SetSpecification(budgetSpec.And <Mobile>(budgetHighCostSpec).Or <Mobile>(premiumSpec.And <Mobile>(premiumLowCostSpec)));
//For senior manager spec we combine the premium spec with premium high cost spec to achieve the constraint all premium mobiles that costs more than or equal to 500.
seniorManager.SetSpecification(premiumSpec.And <Mobile>(premiumHighCostSpec));
employee.SetSuccessor(supervisor);
supervisor.SetSuccessor(manager);
manager.SetSuccessor(seniorManager);
//Default handler
IHandler <Mobile> defaultApprover = new Approver <Mobile>("Default", invProcess.defaultOrder);
ISpecification <Mobile> defaultSpec = new Specification <Mobile>(o => true);
defaultApprover.SetSpecification(defaultSpec);
seniorManager.SetSuccessor(defaultApprover);
mobiles.ForEach(o => employee.HandleRequest(o));
Console.ReadLine();
Console.ReadKey();
}
public void SetSuccessor(Approver successor)
{
this.successor = successor;
}