//============================================================================
// NPreferences::GetValue : Get a value.
//----------------------------------------------------------------------------
NVariant NPreferences::GetValue(const NString &theKey) const
{ NVariant theValue;
// Validate our parameters
NN_ASSERT(!theKey.IsEmpty());
// Get the value
theValue = NTargetPreferences::GetValue(theKey);
if (!theValue.IsValid())
theValue = NPropertyStore::GetValue(theKey);
return(theValue);
}
//============================================================================
// NVariant::CompareValues : Compare two values.
//----------------------------------------------------------------------------
NComparison NVariant::CompareValues(const NVariant &value1, const NVariant &value2)
{ NComparison theResult;
// Check the values
//
// Testing by address gives us a fast test for equality, and a default
// order for undefined cases (e.g., comparing different types).
theResult = GetComparison(value1.mData, value2.mData);
if (theResult == kNCompareEqualTo)
return(theResult);
// Check for NULL values
//
// NULL values can't be compared.
if (!value1.IsValid() || !value2.IsValid())
NN_LOG("Attempted to compare a NULL value");
// Check for mismatched types
//
// Different types can't be compared, except for numeric values which we can
// push through an NNumber to obtain a comparison.
else if (value1.GetType() != value2.GetType())
{
if (value1.IsNumeric() && value2.IsNumeric())
theResult = NNumber(value1).Compare(NNumber(value2));
else
NN_LOG("Attempted to compare different types (%s) (%s)", value1.GetType().name(), value2.GetType().name());
}
// Compare the values
//
// NVariant provides default comparisons for standard comparable objects.
//
// This list can be extended in the future to support new types. Unfortunately we can't
// automatically determine if a type is a sub-class of NComparable, since our type may
// also be a built-in type like 'long' rather than an object.
else
{
if (value1.IsNumeric())
theResult = NNumber(value1).Compare(NNumber(value2));
else if (value1.IsType(typeid(NBitVector)))
theResult = CompareValuesT<NBitVector>(value1, value2);
else if (value1.IsType(typeid(NColor)))
theResult = CompareValuesT<NColor>(value1, value2);
else if (value1.IsType(typeid(NData)))
theResult = CompareValuesT<NData>(value1, value2);
else if (value1.IsType(typeid(NDate)))
theResult = CompareValuesT<NDate>(value1, value2);
else if (value1.IsType(typeid(NDictionary)))
theResult = CompareValuesT<NDictionary>(value1, value2);
else if (value1.IsType(typeid(NFile)))
theResult = CompareValuesT<NFile>(value1, value2);
else if (value1.IsType(typeid(NPoint)))
theResult = CompareValuesT<NPoint>(value1, value2);
else if (value1.IsType(typeid(NRange)))
theResult = CompareValuesT<NRange>(value1, value2);
else if (value1.IsType(typeid(NRectangle)))
theResult = CompareValuesT<NRectangle>(value1, value2);
else if (value1.IsType(typeid(NSize)))
theResult = CompareValuesT<NSize>(value1, value2);
else if (value1.IsType(typeid(NString)))
theResult = CompareValuesT<NString>(value1, value2);
else if (value1.IsType(typeid(NVector)))
theResult = CompareValuesT<NVector>(value1, value2);
else
NN_LOG("NVariant::CompareValues passed an unknown type (%s)", value1.GetType().name());
}
return(theResult);
}