/// <summary>
/// Tests that the current Tolerance is linear with a
/// numeric value, throwing an exception if it is not.
/// </summary>
private void CheckLinearAndNumeric()
{
if (mode != ToleranceMode.Linear)
{
throw new InvalidOperationException(mode == ToleranceMode.None
? ModeMustFollowTolerance
: MultipleToleranceModes);
}
if (!Numerics.IsNumericType(amount))
{
throw new InvalidOperationException(NumericToleranceRequired);
}
}
/// <summary>
/// Compares two objects
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public int Compare(object x, object y)
{
if (x == null)
{
return(y == null ? 0 : -1);
}
else if (y == null)
{
return(+1);
}
if (Numerics.IsNumericType(x) && Numerics.IsNumericType(y))
{
return(Numerics.Compare(x, y));
}
if (x is IComparable)
{
return(((IComparable)x).CompareTo(y));
}
if (y is IComparable)
{
return(-((IComparable)y).CompareTo(x));
}
Type xType = x.GetType();
Type yType = y.GetType();
MethodInfo method = xType.GetMethod("CompareTo", new[] { yType });
if (method != null)
{
return((int)method.Invoke(x, new[] { y }));
}
method = yType.GetMethod("CompareTo", new[] { xType });
if (method != null)
{
return(-(int)method.Invoke(y, new[] { x }));
}
throw new ArgumentException("Neither value implements IComparable or IComparable<T>");
}
private bool ObjectsEqual(object expected, object actual, ref Tolerance tolerance)
{
if (expected == null && actual == null)
{
return(true);
}
if (expected == null || actual == null)
{
return(false);
}
if (object.ReferenceEquals(expected, actual))
{
return(true);
}
Type xType = expected.GetType();
Type yType = actual.GetType();
EqualityAdapter externalComparer = GetExternalComparer(expected, actual);
if (externalComparer != null)
{
return(externalComparer.AreEqual(expected, actual));
}
if (xType.IsArray && yType.IsArray && !compareAsCollection)
{
return(ArraysEqual((Array)expected, (Array)actual, ref tolerance));
}
if (expected is IDictionary && actual is IDictionary)
{
return(DictionariesEqual((IDictionary)expected, (IDictionary)actual, ref tolerance));
}
if (expected is IEnumerable && actual is IEnumerable && !(expected is string && actual is string))
{
return(EnumerablesEqual((IEnumerable)expected, (IEnumerable)actual, ref tolerance));
}
if (expected is string && actual is string)
{
return(StringsEqual((string)expected, (string)actual));
}
if (expected is Stream && actual is Stream)
{
return(StreamsEqual((Stream)expected, (Stream)actual));
}
if (expected is DirectoryInfo && actual is DirectoryInfo)
{
return(DirectoriesEqual((DirectoryInfo)expected, (DirectoryInfo)actual));
}
if (Numerics.IsNumericType(expected) && Numerics.IsNumericType(actual))
{
return(Numerics.AreEqual(expected, actual, ref tolerance));
}
if (tolerance != null && tolerance.Value is TimeSpan)
{
var amount = (TimeSpan)tolerance.Value;
if (expected is DateTime && actual is DateTime)
{
return(((DateTime)expected - (DateTime)actual).Duration() <= amount);
}
if (expected is TimeSpan && actual is TimeSpan)
{
return(((TimeSpan)expected - (TimeSpan)actual).Duration() <= amount);
}
}
#if CLR_2_0 || CLR_4_0
if (FirstImplementsIEquatableOfSecond(xType, yType))
{
return(InvokeFirstIEquatableEqualsSecond(expected, actual));
}
else if (FirstImplementsIEquatableOfSecond(yType, xType))
{
return(InvokeFirstIEquatableEqualsSecond(actual, expected));
}
#endif
return(expected.Equals(actual));
}