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SmartDate implements the IComparable interface, which defines a CompareTo() method. The CompareTo() method is used by the .NET Framework in various ways, most notably to support sorting within sorted collections and lists. This CompareTo() method is overloaded to also include a strongly typed CompareTo() that directly accepts a SmartDate: int IComparable.CompareTo(object value) { if (value is SmartDate) return CompareTo((SmartDate)value); else throw new ArgumentException(Resources.ValueNotSmartDateException); }
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CHAPTER 5 s COMPLETING THE FRAMEWORK
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public int CompareTo(SmartDate value) { if (this.IsEmpty && value.IsEmpty) return 0; else return _date.CompareTo(value.Date); } Because empty dates are maintained as DateTime.MinValue or DateTime.MaxValue, they will automatically sort to the top or bottom of the list based on the setting of _emptyIsMax. For ease of use, SmartDate also includes similar CompareTo() overloads that accept string and DateTime.
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SmartDate should provide arithmetic manipulation of the date value. Since the goal is to emulate a regular DateTime data type, it should provide at least Add() and Subtract() methods: public DateTime Add(TimeSpan value) { if (IsEmpty) return this.Date; else return this.Date.Add(value); } public DateTime Subtract(TimeSpan value) { if (IsEmpty) return this.Date; else return this.Date.Subtract(value); } public TimeSpan Subtract(DateTime value) { if (IsEmpty) return TimeSpan.Zero; else return this.Date.Subtract(value); } Notice the special handling of empty SmartDate values. Adding or subtracting any value to an empty value results in an empty or zero value as appropriate. In any other case, the addition or subtraction is delegated to the actual underlying DateTime value in _date.
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To make SmartDate as similar to DateTime as possible, it needs to overload the operators that are overloaded by DateTime, including equality, comparison, addition, and subtraction.
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Equality and inequality operators delegate to the override of the Equals() method: public override bool Equals(object obj) { if (obj is SmartDate)
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CHAPTER 5 s COMPLETING THE FRAMEWORK
{ SmartDate tmp = (SmartDate)obj; if (this.IsEmpty && tmp.IsEmpty) return true; else return this.Date.Equals(tmp.Date); } else if (obj is DateTime) return this.Date.Equals((DateTime)obj); else if (obj is string) return (this.CompareTo(obj.ToString()) == 0); else return false; } public static bool operator ==(SmartDate obj1, SmartDate obj2) { return obj1.Equals(obj2); } public static bool operator !=(SmartDate obj1, SmartDate obj2) { return !obj1.Equals(obj2); } The Equals() method is relatively complex. This is because it supports the idea of comparing a SmartDate to another SmartDate, to a string value, or to a regular DateTime value. In each case, it honors the idea of an empty date value. Then the equality and inequality operators simply delegate to the Equals() method. There are overloads of the equality and inequality operators to allow a SmartDate to be directly compared to a DateTime or string value.
Comparison
In addition to equality, it is possible to compare SmartDate values to see if they are greater than or less than another SmartDate, string, or DateTime value. This is easily accomplished given the implementation of the CompareTo() methods earlier. For instance, here are a couple of the comparison operators: public static bool operator >(SmartDate obj1, SmartDate obj2) { return obj1.CompareTo(obj2) > 0; } public static bool operator <(SmartDate obj1, SmartDate obj2) { return obj1.CompareTo(obj2) < 0; } Along with greater than and less than, there are greater than or equals, and less than or equals operators that work in a similar manner. And as with equality and inequality, there are overloads of all these operators for string and DateTime comparison as well.
CHAPTER 5 s COMPLETING THE FRAMEWORK
Addition and Subtraction
The Add() and Subtract() methods implemented earlier are also made available through operators: public static SmartDate operator +(SmartDate start, TimeSpan span) { return new SmartDate(start.Add(span), start.EmptyIsMin); } public static SmartDate operator -(SmartDate start, TimeSpan span) { return new SmartDate(start.Subtract(span), start.EmptyIsMin); } public static TimeSpan operator -(SmartDate start, SmartDate finish) { return start.Subtract(finish.Date); } Combined, all these methods and operators mean that a SmartDate can be treated almost exactly like a DateTime.
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