public void MathComparisonTest()
{
var r = new ERational(142342, 432);
var f = EFloat.FromString("1.5", null);
Console.WriteLine("{0}, {1}", r, f);
Assert.IsTrue(r.CompareToBinary(f) > 0);
}
/// <summary>Compares two CBOR numbers. In this implementation, the two
/// numbers' mathematical values are compared. Here, NaN (not-a-number)
/// is considered greater than any number.</summary>
/// <param name='other'>A value to compare with. Can be null.</param>
/// <returns>A negative number, if this value is less than the other
/// object; or 0, if both values are equal; or a positive number, if
/// this value is less than the other object or if the other object is
/// null.
/// <para>This implementation returns a positive number if <paramref
/// name='other'/> is null, to conform to the.NET definition of
/// CompareTo. This is the case even in the Java version of this
/// library, for consistency's sake, even though implementations of
/// <c>Comparable.compareTo()</c> in Java ought to throw an exception
/// if they receive a null argument rather than treating null as less
/// or greater than any object.</para>.</returns>
public int CompareTo(CBORNumber other)
{
if (other == null)
{
return(1);
}
if (this == other)
{
return(0);
}
var cmp = 0;
Kind typeA = this.kind;
Kind typeB = other.kind;
object objA = this.value;
object objB = other.value;
if (typeA == typeB)
{
switch (typeA)
{
case Kind.Integer: {
var a = (long)objA;
var b = (long)objB;
cmp = (a == b) ? 0 : ((a < b) ? -1 : 1);
break;
}
case Kind.EInteger: {
var bigintA = (EInteger)objA;
var bigintB = (EInteger)objB;
cmp = bigintA.CompareTo(bigintB);
break;
}
case Kind.Double: {
var a = (double)objA;
var b = (double)objB;
// Treat NaN as greater than all other numbers
cmp = Double.IsNaN(a) ? (Double.IsNaN(b) ? 0 : 1) :
(Double.IsNaN(b) ? (-1) : ((a == b) ? 0 : ((a < b) ? -1 :
1)));
break;
}
case Kind.EDecimal: {
cmp = ((EDecimal)objA).CompareTo((EDecimal)objB);
break;
}
case Kind.EFloat: {
cmp = ((EFloat)objA).CompareTo(
(EFloat)objB);
break;
}
case Kind.ERational: {
cmp = ((ERational)objA).CompareTo(
(ERational)objB);
break;
}
default: throw new InvalidOperationException("Unexpected data type");
}
}
else
{
int s1 = GetNumberInterface(typeA).Sign(objA);
int s2 = GetNumberInterface(typeB).Sign(objB);
if (s1 != s2 && s1 != 2 && s2 != 2)
{
// if both types are numbers
// and their signs are different
return((s1 < s2) ? -1 : 1);
}
if (s1 == 2 && s2 == 2)
{
// both are NaN
cmp = 0;
}
else if (s1 == 2)
{
// first object is NaN
return(1);
}
else if (s2 == 2)
{
// second object is NaN
return(-1);
}
else
{
// DebugUtility.Log("a=" + this + " b=" + other);
if (typeA == Kind.ERational)
{
ERational e1 =
GetNumberInterface(typeA).AsExtendedRational(objA);
if (typeB == Kind.EDecimal)
{
EDecimal e2 =
GetNumberInterface(typeB).AsExtendedDecimal(objB);
cmp = e1.CompareToDecimal(e2);
}
else
{
EFloat e2 = GetNumberInterface(typeB).AsExtendedFloat(objB);
cmp = e1.CompareToBinary(e2);
}
}
else if (typeB == Kind.ERational)
{
ERational e2 =
GetNumberInterface(typeB).AsExtendedRational(objB);
if (typeA == Kind.EDecimal)
{
EDecimal e1 =
GetNumberInterface(typeA).AsExtendedDecimal(objA);
cmp = e2.CompareToDecimal(e1);
cmp = -cmp;
}
else
{
EFloat e1 =
GetNumberInterface(typeA).AsExtendedFloat(objA);
cmp = e2.CompareToBinary(e1);
cmp = -cmp;
}
}
else if (typeA == Kind.EDecimal ||
typeB == Kind.EDecimal)
{
EDecimal e1 = null;
EDecimal e2 = null;
if (typeA == Kind.EFloat)
{
var ef1 = (EFloat)objA;
e2 = (EDecimal)objB;
cmp = e2.CompareToBinary(ef1);
cmp = -cmp;
}
else if (typeB == Kind.EFloat)
{
var ef1 = (EFloat)objB;
e2 = (EDecimal)objA;
cmp = e2.CompareToBinary(ef1);
}
else
{
e1 = GetNumberInterface(typeA).AsExtendedDecimal(objA);
e2 = GetNumberInterface(typeB).AsExtendedDecimal(objB);
cmp = e1.CompareTo(e2);
}
}
else if (typeA == Kind.EFloat || typeB ==
Kind.EFloat || typeA == Kind.Double || typeB ==
Kind.Double)
{
EFloat e1 =
GetNumberInterface(typeA).AsExtendedFloat(objA);
EFloat e2 = GetNumberInterface(typeB).AsExtendedFloat(objB);
cmp = e1.CompareTo(e2);
}
else
{
EInteger b1 = GetNumberInterface(typeA).AsEInteger(objA);
EInteger b2 = GetNumberInterface(typeB).AsEInteger(objB);
cmp = b1.CompareTo(b2);
}
}
}
return(cmp);
}
