void SetDefaultValue(object value, bool forcedTypeCheck)
{
if (forcedTypeCheck || !this._defaultValue.Equals(value))
{
if (value == null || value == DBNull.Value)
{
_defaultValue = GetDefaultValueForType(DataType);
}
else if (DataType.IsInstanceOfType(value))
{
_defaultValue = value;
}
else
{
try {
_defaultValue = ConvertExtensions.ChangeType(value, DataType);
} catch (InvalidCastException) {
string msg = String.Format("Default Value of type '{0}' is not compatible with column type '{1}'", value.GetType(), DataType);
throw new DataException(msg);
}
}
}
// store default value in the table if already belongs to
if (Table != null && Table.DefaultValuesRowIndex != -1)
{
DataContainer [Table.DefaultValuesRowIndex] = _defaultValue;
}
}
//(note: o1 and o2 must both be of type Int32/Int64/Decimal/Double)
internal static TypeCode ToSameType(ref IConvertible o1, ref IConvertible o2)
{
TypeCode tc1 = o1.GetTypeCode();
TypeCode tc2 = o2.GetTypeCode();
if (tc1 == tc2)
{
return(tc1);
}
if (tc1 == TypeCode.DBNull || tc2 == TypeCode.DBNull)
{
return(TypeCode.DBNull);
}
// is it ok to make such assumptions about the order of an enum?
if (tc1 < tc2)
{
o1 = (IConvertible)ConvertExtensions.ChangeType(o1, tc2);
return(tc2);
}
else
{
o2 = (IConvertible)ConvertExtensions.ChangeType(o2, tc1);
return(tc1);
}
}
private IConvertible CalcStatisticalFunction(object[] values)
{
if (count < 2)
{
return(DBNull.Value);
}
double average = (double)ConvertExtensions.ChangeType(result, TypeCode.Double) / count;
double res = 0.0;
foreach (object val in values)
{
if (val == null)
{
continue;
}
double diff = average - (double)ConvertExtensions.ChangeType(val, TypeCode.Double);
res += System.Math.Pow(diff, 2);
}
res /= (count - 1);
if (function == AggregationFunction.StDev)
{
res = System.Math.Sqrt(res);
}
return(res);
}
internal static int Compare(IComparable o1, IComparable o2, bool caseSensitive)
{
//TODO: turn this "conversion pipeline" into something nicer
try {
if (o1 is string && Numeric.IsNumeric(o2))
{
o1 = (IComparable)ConvertExtensions.ChangeType(o1, o2.GetType());
}
else if (o2 is string && Numeric.IsNumeric(o1))
{
o2 = (IComparable)ConvertExtensions.ChangeType(o2, o1.GetType());
}
else if (o1 is string && o2 is Guid)
{
o2 = o2.ToString();
}
else if (o2 is string && o1 is Guid)
{
o1 = o1.ToString();
}
} catch (FormatException) {
throw new EvaluateException(String.Format("Cannot perform compare operation on {0} and {1}.", o1.GetType(), o2.GetType()));
}
if (o1 is string && o2 is string)
{
o1 = ((string)o1).TrimEnd(IgnoredTrailingChars);
o2 = ((string)o2).TrimEnd(IgnoredTrailingChars);
if (!caseSensitive)
{
o1 = ((string)o1).ToLower();
o2 = ((string)o2).ToLower();
}
}
if (o1 is DateTime && o2 is string && Thread.CurrentThread.CurrentCulture != CultureInfo.InvariantCulture)
{
// DateTime is always CultureInfo.InvariantCulture
o2 = (IComparable)DateTime.Parse((string)o2, CultureInfo.InvariantCulture);
}
else if (o2 is DateTime && o1 is string &&
Thread.CurrentThread.CurrentCulture != CultureInfo.InvariantCulture)
{
// DateTime is always CultureInfo.InvariantCulture
o1 = (IComparable)DateTime.Parse((string)o1, CultureInfo.InvariantCulture);
}
else if (o2 is DateTime && o1 is string && Thread.CurrentThread.CurrentCulture != CultureInfo.InvariantCulture)
{
// DateTime is always CultureInfo.InvariantCulture
o1 = (IComparable)DateTime.Parse((string)o1, CultureInfo.InvariantCulture);
}
if (o1.GetType() != o2.GetType())
{
o2 = (IComparable)ConvertExtensions.ChangeType(o2, o1.GetType());
}
return(o1.CompareTo(o2));
}
private TResult GetParameterValueOrDefault <TResult>(CommandParameter parameter, TResult defaultValue = default(TResult))
{
if (parameter == null)
{
return(defaultValue);
}
var value = parameter.GetEvaluatedValue(this.ToDictionary());
if (value == null)
{
return(defaultValue);
}
if (string.IsNullOrEmpty(value.ToStringOrEmpty()))
{
return(defaultValue);
}
if (value is IConvertible)
{
return((TResult)ConvertExtensions.ChangeType(value, typeof(TResult)));
}
return((TResult)value);
}
protected override int DoCompareValues(int index1, int index2)
{
object obj1 = _values [index1];
object obj2 = _values [index2];
if (obj1 == obj2)
{
return(0);
}
if (obj1 is IComparable)
{
try {
return(((IComparable)obj1).CompareTo(obj2));
} catch {
if (obj2 is IComparable)
{
obj2 = ConvertExtensions.ChangeType(obj2, Type.GetTypeCode(obj1.GetType()));
return(((IComparable)obj1).CompareTo(obj2));
}
}
}
return(String.Compare(obj1.ToString(), obj2.ToString()));
}
public static T AskInput <T>(string message)
{
Console.WriteLine();
Console.WriteLine(message);
string input = Console.ReadLine();
return(ConvertExtensions.ChangeType <T>(input));
}
//extends to Int32/Int64/Decimal/Double
internal static IConvertible Unify(IConvertible o)
{
switch (o.GetTypeCode())
{
case TypeCode.Char:
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
return((IConvertible)ConvertExtensions.ChangeType(o, TypeCode.Int32));
case TypeCode.UInt32:
return((IConvertible)ConvertExtensions.ChangeType(o, TypeCode.Int64));
case TypeCode.UInt64:
return((IConvertible)ConvertExtensions.ChangeType(o, TypeCode.Decimal));
case TypeCode.Single:
return((IConvertible)ConvertExtensions.ChangeType(o, TypeCode.Double));
default:
return(o);
}
}
override public object Eval(DataRow row)
{
object val = expr.Eval(row);
// TMPFIX :Eval shud never really return a null.. DBNull.Value but not null
// needs to be done for all expressions .. for now ,just check for null
if (val == null)
{
return(DBNull.Value);
}
if (val == DBNull.Value || val.GetType() == targetType)
{
return(val);
}
//--> String is always allowed
if (targetType == typeof(string))
{
return(val.ToString());
}
//only TimeSpan <--> String is allowed
if (targetType == typeof(TimeSpan))
{
if (val is string)
{
return(TimeSpan.Parse((string)val));
}
else
{
ThrowInvalidCastException(val);
}
}
if (val is TimeSpan)
{
ThrowInvalidCastException(val);
}
//only Char <--> String/Int32/UInt32 is allowed
if (val is Char && !(targetType == typeof(Int32) || targetType == typeof(UInt32)))
{
ThrowInvalidCastException(val);
}
if (targetType == typeof(Char) && !(val is Int32 || val is UInt32))
{
ThrowInvalidCastException(val);
}
//bool <--> Char/Single/Double/Decimal/TimeSpan/DateTime is not allowed
if (val is Boolean && (targetType == typeof(Single) || targetType == typeof(Double) || targetType == typeof(Decimal)))
{
ThrowInvalidCastException(val);
}
if (targetType == typeof(Boolean) && (val is Single || val is Double || val is Decimal))
{
ThrowInvalidCastException(val);
}
//Convert throws the remaining invalid casts
return(ConvertExtensions.ChangeType(val, targetType));
}