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//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
namespace Mono.Data.SqlExpressions {
internal class Numeric {
internal static bool IsNumeric (object o) {
if (o is IConvertible) {
TypeCode tc = ((IConvertible)o).GetTypeCode();
if(TypeCode.Char < tc && tc <= TypeCode.Decimal)
return true;
}
return false;
}
//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)Convert.ChangeType (o, TypeCode.Int32);
case TypeCode.UInt32:
return (IConvertible)Convert.ChangeType (o, TypeCode.Int64);
case TypeCode.UInt64:
return (IConvertible)Convert.ChangeType (o, TypeCode.Decimal);
case TypeCode.Single:
return (IConvertible)Convert.ChangeType (o, TypeCode.Double);
default:
return o;
}
}
//(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)Convert.ChangeType (o1, tc2);
return tc2;
}
else
{
o2 = (IConvertible)Convert.ChangeType (o2, tc1);
return tc1;
}
}
internal static IConvertible Add (IConvertible o1, IConvertible o2)
{
switch (ToSameType (ref o1, ref o2)) {
case TypeCode.Int32:
return (long)((int)o1 + (int)o2);
case TypeCode.Int64:
return (long)o1 + (long)o2;
case TypeCode.Double:
return (double)o1 + (double)o2;
case TypeCode.Decimal:
return (decimal)o1 + (decimal)o2;
default:
return DBNull.Value;
}
}
internal static IConvertible Subtract (IConvertible o1, IConvertible o2)
{
switch (ToSameType (ref o1, ref o2)) {
case TypeCode.Int32:
return (int)o1 - (int)o2;
case TypeCode.Int64:
return (long)o1 - (long)o2;
case TypeCode.Double:
return (double)o1 - (double)o2;
case TypeCode.Decimal:
return (decimal)o1 - (decimal)o2;
default:
return DBNull.Value;
}
}
internal static IConvertible Multiply (IConvertible o1, IConvertible o2)
{
switch (ToSameType (ref o1, ref o2)) {
case TypeCode.Int32:
return (int)o1 * (int)o2;
case TypeCode.Int64:
return (long)o1 * (long)o2;
case TypeCode.Double:
return (double)o1 * (double)o2;
case TypeCode.Decimal:
return (decimal)o1 * (decimal)o2;
default:
return DBNull.Value;
}
}
internal static IConvertible Divide (IConvertible o1, IConvertible o2)
{
switch (ToSameType (ref o1, ref o2)) {
case TypeCode.Int32:
return (int)o1 / (int)o2;
case TypeCode.Int64:
return (long)o1 / (long)o2;
case TypeCode.Double:
return (double)o1 / (double)o2;
case TypeCode.Decimal:
return (decimal)o1 / (decimal)o2;
default:
return DBNull.Value;
}
}
internal static IConvertible Modulo (IConvertible o1, IConvertible o2)
{
switch (ToSameType (ref o1, ref o2)) {
case TypeCode.Int32:
return (int)o1 % (int)o2;
case TypeCode.Int64:
return (long)o1 % (long)o2;
case TypeCode.Double:
return (double)o1 % (double)o2;
case TypeCode.Decimal:
return (decimal)o1 % (decimal)o2;
default:
return DBNull.Value;
}
}
internal static IConvertible Negative (IConvertible o)
{
switch (o.GetTypeCode()) {
case TypeCode.Int32:
return -((int)o);
case TypeCode.Int64:
return -((long)o);
case TypeCode.Double:
return -((double)o);
case TypeCode.Decimal:
return -((decimal)o);
default:
return DBNull.Value;
}
}
internal static IConvertible Min (IConvertible o1, IConvertible o2)
{
switch (ToSameType (ref o1, ref o2)) {
case TypeCode.Int32:
return System.Math.Min ((int)o1, (int)o2);
case TypeCode.Int64:
return System.Math.Min ((long)o1, (long)o2);
case TypeCode.Double:
return System.Math.Min ((double)o1, (double)o2);
case TypeCode.Decimal:
return System.Math.Min ((decimal)o1, (decimal)o2);
case TypeCode.String:
int result = String.Compare ((string)o1, (string)o2);
if (result <= 0)
return o1;
return o2;
default:
return DBNull.Value;
}
}
internal static IConvertible Max (IConvertible o1, IConvertible o2)
{
switch (ToSameType (ref o1, ref o2)) {
case TypeCode.Int32:
return System.Math.Max ((int)o1, (int)o2);
case TypeCode.Int64:
return System.Math.Max ((long)o1, (long)o2);
case TypeCode.Double:
return System.Math.Max ((double)o1, (double)o2);
case TypeCode.Decimal:
return System.Math.Max ((decimal)o1, (decimal)o2);
case TypeCode.String:
int result = String.Compare ((string)o1, (string)o2);
if (result >= 0)
return o1;
return o2;
default:
return DBNull.Value;
}
}
}
}
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