/// <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 Type[] { yType });
if (method != null)
{
return((int)method.Invoke(x, new object[] { y }));
}
method = yType.GetMethod("CompareTo", new Type[] { xType });
if (method != null)
{
return(-(int)method.Invoke(y, new object[] { x }));
}
throw new ArgumentException("Neither value implements IComparable or IComparable<T>");
}
/// <summary>
/// Compares two objects for equality within a tolerance.
/// </summary>
public bool AreEqual(object x, object y, ref Tolerance tolerance)
{
this.failurePoints = new List <object>();
if (x == null && y == null)
{
return(true);
}
if (x == null || y == null)
{
return(false);
}
if (object.ReferenceEquals(x, y))
{
return(true);
}
Type xType = x.GetType();
Type yType = y.GetType();
EqualityAdapter externalComparer = GetExternalComparer(x, y);
if (externalComparer != null)
{
return(externalComparer.AreEqual(x, y));
}
if (xType.IsArray && yType.IsArray && !compareAsCollection)
{
return(ArraysEqual((Array)x, (Array)y, ref tolerance));
}
if (x is IDictionary && y is IDictionary)
{
return(DictionariesEqual((IDictionary)x, (IDictionary)y, ref tolerance));
}
//if (x is ICollection && y is ICollection)
// return CollectionsEqual((ICollection)x, (ICollection)y, ref tolerance);
if (x is IEnumerable && y is IEnumerable && !(x is string && y is string))
{
return(EnumerablesEqual((IEnumerable)x, (IEnumerable)y, ref tolerance));
}
if (x is string && y is string)
{
return(StringsEqual((string)x, (string)y));
}
if (x is Stream && y is Stream)
{
return(StreamsEqual((Stream)x, (Stream)y));
}
if (Numerics.IsNumericType(x) && Numerics.IsNumericType(y))
{
return(Numerics.AreEqual(x, y, ref tolerance));
}
if (tolerance != null && tolerance.Value is TimeSpan)
{
TimeSpan amount = (TimeSpan)tolerance.Value;
if (x is DateTime && y is DateTime)
{
return(((DateTime)x - (DateTime)y).Duration() <= amount);
}
if (x is TimeSpan && y is TimeSpan)
{
return(((TimeSpan)x - (TimeSpan)y).Duration() <= amount);
}
}
if (FirstImplementsIEquatableOfSecond(xType, yType))
{
return(InvokeFirstIEquatableEqualsSecond(x, y));
}
else if (FirstImplementsIEquatableOfSecond(yType, xType))
{
return(InvokeFirstIEquatableEqualsSecond(y, x));
}
return(x.Equals(y));
}