import { Property } from "./Property";

interface Comparable<T>
{
  equals( other:T ):boolean
}

export class ComparableProperty<T extends Comparable<T> > extends Property<T>
{ 
  isEqual( a:T, b:T )
  {
    let valueA = a === null ? 0 : a === undefined ? 1 : 2;
    let valueB = b === null ? 0 : b === undefined ? 1 : 2;

    if ( valueA !== valueB )
    {
      return false;
    }

    if ( valueA !== 2 )
    {      
      return true;
    }    

    return a.equals( b );
  }
}