82 lines
2.5 KiB
C#
82 lines
2.5 KiB
C#
//
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// ArithmeticExpressions.cs
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//
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// Author:
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// Juraj Skripsky (juraj@hotfeet.ch)
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//
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// (C) 2004 HotFeet GmbH (http://www.hotfeet.ch)
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Data;
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namespace Mono.Data.SqlExpressions {
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internal class Negative : UnaryExpression {
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public Negative (IExpression e) : base (e) {}
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override public object Eval (DataRow row)
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{
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return Numeric.Negative ((IConvertible)expr.Eval (row));
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}
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}
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internal class ArithmeticOperation : BinaryOpExpression {
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public ArithmeticOperation (Operation op, IExpression e1, IExpression e2) : base (op, e1, e2) {}
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override public object Eval (DataRow row)
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{
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object obj1 = expr1.Eval (row);
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if (obj1 == DBNull.Value || obj1 == null)
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return obj1;
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object obj2 = expr2.Eval (row);
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if (obj2 == DBNull.Value || obj2 == null)
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return obj2;
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if (op == Operation.ADD && (obj1 is string || obj2 is string))
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return obj1.ToString () + obj2.ToString ();
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IConvertible o1 = (IConvertible)obj1;
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IConvertible o2 = (IConvertible)obj2;
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switch (op) {
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case Operation.ADD:
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return Numeric.Add (o1, o2);
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case Operation.SUB:
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return Numeric.Subtract (o1, o2);
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case Operation.MUL:
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return Numeric.Multiply (o1, o2);
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case Operation.DIV:
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return Numeric.Divide (o1, o2);
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case Operation.MOD:
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return Numeric.Modulo (o1, o2);
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default:
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return 0;
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}
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}
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}
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}
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