2 // ArithmeticExpressions.cs
5 // Juraj Skripsky (juraj@hotfeet.ch)
7 // (C) 2004 HotFeet GmbH (http://www.hotfeet.ch)
11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
13 // Permission is hereby granted, free of charge, to any person obtaining
14 // a copy of this software and associated documentation files (the
15 // "Software"), to deal in the Software without restriction, including
16 // without limitation the rights to use, copy, modify, merge, publish,
17 // distribute, sublicense, and/or sell copies of the Software, and to
18 // permit persons to whom the Software is furnished to do so, subject to
19 // the following conditions:
21 // The above copyright notice and this permission notice shall be
22 // included in all copies or substantial portions of the Software.
24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
34 using System.Collections;
37 namespace Mono.Data.SqlExpressions {
38 internal class Negative : UnaryExpression {
39 public Negative (IExpression e) : base (e) {}
41 override public object Eval (DataRow row)
43 return Numeric.Negative ((IConvertible)expr.Eval (row));
47 internal class ArithmeticOperation : BinaryOpExpression {
48 public ArithmeticOperation (Operation op, IExpression e1, IExpression e2) : base (op, e1, e2) {}
50 override public object Eval (DataRow row)
52 object obj1 = expr1.Eval (row);
53 if (obj1 == DBNull.Value || obj1 == null)
55 object obj2 = expr2.Eval (row);
56 if (obj2 == DBNull.Value || obj2 == null)
59 if (op == Operation.ADD && (obj1 is string || obj2 is string))
60 return obj1.ToString () + obj2.ToString ();
62 IConvertible o1 = (IConvertible)obj1;
63 IConvertible o2 = (IConvertible)obj2;
67 return Numeric.Add (o1, o2);
69 return Numeric.Subtract (o1, o2);
71 return Numeric.Multiply (o1, o2);
73 return Numeric.Divide (o1, o2);
75 return Numeric.Modulo (o1, o2);