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//
// ArithmeticExpressions.cs
//
// Author:
// Juraj Skripsky (juraj@hotfeet.ch)
//
// (C) 2004 HotFeet GmbH (http://www.hotfeet.ch)
//
//
// 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;
using System.Data;
namespace Mono.Data.SqlExpressions {
internal class Negative : UnaryExpression {
public Negative (IExpression e) : base (e) {}
override public object Eval (DataRow row)
{
return Numeric.Negative ((IConvertible)expr.Eval (row));
}
}
internal class ArithmeticOperation : BinaryOpExpression {
public ArithmeticOperation (Operation op, IExpression e1, IExpression e2) : base (op, e1, e2) {}
override public object Eval (DataRow row)
{
object obj1 = expr1.Eval (row);
if (obj1 == DBNull.Value || obj1 == null)
return obj1;
object obj2 = expr2.Eval (row);
if (obj2 == DBNull.Value || obj2 == null)
return obj2;
if (op == Operation.ADD && (obj1 is string || obj2 is string))
return obj1.ToString () + obj2.ToString ();
IConvertible o1 = (IConvertible)obj1;
IConvertible o2 = (IConvertible)obj2;
switch (op) {
case Operation.ADD:
return Numeric.Add (o1, o2);
case Operation.SUB:
return Numeric.Subtract (o1, o2);
case Operation.MUL:
return Numeric.Multiply (o1, o2);
case Operation.DIV:
return Numeric.Divide (o1, o2);
case Operation.MOD:
return Numeric.Modulo (o1, o2);
default:
return 0;
}
}
}
}
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