104 lines
3.0 KiB
C#
104 lines
3.0 KiB
C#
//
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// Like.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 Like : UnaryExpression {
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readonly IExpression _pattern;
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public Like (IExpression e, IExpression pattern) : base (e)
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{
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_pattern = pattern;
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}
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public override bool Equals(object obj)
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{
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if (!base.Equals (obj))
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return false;
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if (!(obj is Like))
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return false;
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Like other = (Like) obj;
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return _pattern.Equals (other._pattern);
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}
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public override int GetHashCode()
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{
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return _pattern.GetHashCode () ^ base.GetHashCode ();
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}
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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 == null || o == DBNull.Value)
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return false;
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string str = (string)o;
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bool openStart, openEnd;
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string pattern = (string) _pattern.Eval (row);
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string original = pattern;
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int len = pattern.Length;
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openStart = (pattern [0] == '*' || pattern [0] == '%');
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openEnd = (pattern [len - 1] == '*' || pattern [len - 1] == '%');
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pattern = pattern.Trim ('*', '%');
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pattern = pattern.Replace ("[*]", "[[0]]");
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pattern = pattern.Replace ("[%]", "[[1]]");
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if (pattern.IndexOf ('*') != -1 || pattern.IndexOf ('%') != -1)
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throw new EvaluateException (String.Format ("Pattern '{0}' is invalid.", original));
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pattern = pattern.Replace ("[[0]]", "*");
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pattern = pattern.Replace ("[[1]]", "%");
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pattern = pattern.Replace ("[[]", "[");
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pattern = pattern.Replace ("[]]", "]");
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if (!row.Table.CaseSensitive) {
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str = str.ToLower();
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pattern = pattern.ToLower();
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}
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int idx = str.IndexOf (pattern);
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if (idx == -1)
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return false;
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return (idx == 0 || openStart) && (idx + pattern.Length == str.Length || openEnd);
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}
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override public bool EvalBoolean (DataRow row)
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{
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return (bool)Eval (row);
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}
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}
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}
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