73 lines
2.2 KiB
C#
73 lines
2.2 KiB
C#
//
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// BooleanExpressions.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 Negation : UnaryExpression {
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public Negation (IExpression e) : base (e) {}
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override public object Eval (DataRow row)
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{
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object o = expr.Eval (row);
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if (o == DBNull.Value)
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return o;
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return !((bool)o);
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}
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override public bool EvalBoolean (DataRow row)
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{
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return !expr.EvalBoolean (row);
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}
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}
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internal class BoolOperation : BinaryOpExpression {
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public BoolOperation (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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return EvalBoolean (row);
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}
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override public bool EvalBoolean (DataRow row)
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{
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if (op == Operation.OR)
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return (expr1.EvalBoolean (row)) || (expr2.EvalBoolean (row));
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if (op == Operation.AND)
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return (expr1.EvalBoolean (row)) && (expr2.EvalBoolean (row));
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return false;
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}
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}
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}
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