120 lines
4.3 KiB
C#
120 lines
4.3 KiB
C#
//
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// Comparison.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.Data;
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using System.Threading;
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using System.Globalization;
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namespace Mono.Data.SqlExpressions {
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internal class Comparison : BinaryOpExpression {
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public Comparison (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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public override bool EvalBoolean (DataRow row)
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{
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IComparable o1 = expr1.Eval (row) as IComparable;
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IComparable o2 = expr2.Eval (row) as IComparable;
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if (o1 == null || o2 == null) {
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if (o1 == null && o2 == null)
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return (op == Operation.EQ);
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else
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return (op == Operation.NE);
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}
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int result = Compare (o1, o2, row.Table.CaseSensitive);
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if (result < 0) {
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return (op == Operation.NE || op == Operation.LE || op == Operation.LT);
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}
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if (result > 0) {
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return (op == Operation.NE || op == Operation.GE || op == Operation.GT);
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}
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// result == 0
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return (op == Operation.EQ || op == Operation.LE || op == Operation.GE);
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}
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// certain trailing whitespace chars (including space) are ignored by .NET when comparing strings. See bug #79695.
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private static readonly char[] IgnoredTrailingChars = { (char) 0x20, (char) 0x3000, (char) 0xFEFF };
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internal static int Compare (IComparable o1, IComparable o2, bool caseSensitive)
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{
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//TODO: turn this "conversion pipeline" into something nicer
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try {
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if (o1 is string && Numeric.IsNumeric (o2))
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o1 = (IComparable) Convert.ChangeType (o1, o2.GetType ());
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else if (o2 is string && Numeric.IsNumeric (o1))
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o2 = (IComparable) Convert.ChangeType (o2, o1.GetType ());
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else if (o1 is string && o2 is Guid)
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o2 = o2.ToString ();
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else if (o2 is string && o1 is Guid)
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o1 = o1.ToString ();
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} catch (FormatException) {
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throw new EvaluateException (String.Format ("Cannot perform compare operation on {0} and {1}.", o1.GetType(), o2.GetType()));
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}
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if (o1 is string && o2 is string) {
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o1 = ((string) o1).TrimEnd (IgnoredTrailingChars);
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o2 = ((string) o2).TrimEnd (IgnoredTrailingChars);
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if (!caseSensitive) {
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o1 = ((string) o1).ToLower ();
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o2 = ((string) o2).ToLower ();
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}
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}
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if (o1 is DateTime && o2 is string && Thread.CurrentThread.CurrentCulture != CultureInfo.InvariantCulture) {
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// DateTime is always CultureInfo.InvariantCulture
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o2 = (IComparable) DateTime.Parse ((string)o2, CultureInfo.InvariantCulture);
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} else if (o2 is DateTime && o1 is string &&
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Thread.CurrentThread.CurrentCulture != CultureInfo.InvariantCulture) {
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// DateTime is always CultureInfo.InvariantCulture
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o1 = (IComparable) DateTime.Parse ((string)o1, CultureInfo.InvariantCulture);
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}
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else if (o2 is DateTime && o1 is string && Thread.CurrentThread.CurrentCulture != CultureInfo.InvariantCulture) {
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// DateTime is always CultureInfo.InvariantCulture
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o1 = (IComparable) DateTime.Parse ((string)o1, CultureInfo.InvariantCulture);
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}
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if (o1.GetType () != o2.GetType ())
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o2 = (IComparable)Convert.ChangeType (o2, o1.GetType ());
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return o1.CompareTo (o2);
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}
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}
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}
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