/**
* Copyright (c) 2007, Ritu Jain, Chinmay Nagarkar and Sahi Technologies Pvt Ltd
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Sahi Technologies Pvt. Ltd./Esahi.com nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using BaseEvaluatororg.drools.base.BaseEvaluator;
using Evaluatororg.drools.spi.Evaluator;
namespace org.drools.dotnet.evaluator{
public class StringFactory
{
public static Evaluator getStringEvaluator(int operator_Renamed)
{
switch (operator_Renamed)
{
case Evaluator.__Fields.EQUAL:
return StringEqualEvaluator.INSTANCE;
case Evaluator.__Fields.NOT_EQUAL:
return StringNotEqualEvaluator.INSTANCE;
case Evaluator.__Fields.MATCHES:
return StringMatchesEvaluator.INSTANCE;
default:
throw new System.SystemException("Operator '" + operator_Renamed + "' does not exist for StringEvaluator");
}
}
internal class StringEqualEvaluator:BaseEvaluator
{
private const long serialVersionUID = 5282693491345148054L;
public static readonly Evaluator INSTANCE = new StringEqualEvaluator();
internal StringEqualEvaluator():base(Evaluator.__Fields.STRING_TYPE, Evaluator.__Fields.EQUAL)
{
}
public override bool evaluate(System.Object object1, System.Object object2)
{
if (object1 == null)
{
return object2 == null;
}
return object1.Equals(object2);
}
public virtual System.String toString()
{
return "String ==";
}
}
internal class StringNotEqualEvaluator:BaseEvaluator
{
private const long serialVersionUID = - 3385245390840913608L;
public static readonly Evaluator INSTANCE = new StringNotEqualEvaluator();
internal StringNotEqualEvaluator():base(Evaluator.__Fields.STRING_TYPE, Evaluator.__Fields.NOT_EQUAL)
{
}
public override bool evaluate(System.Object object1, System.Object object2)
{
if (object1 == null)
{
return !(object2 == null);
}
return !object1.Equals(object2);
}
public virtual System.String toString()
{
return "String !=";
}
}
internal class StringMatchesEvaluator:BaseEvaluator
{
private const long serialVersionUID = 5934192092501066510L;
public static readonly Evaluator INSTANCE = new StringMatchesEvaluator();
internal StringMatchesEvaluator():base(Evaluator.__Fields.STRING_TYPE, Evaluator.__Fields.MATCHES)
{
}
public override bool evaluate(object object1, object object2)
{
System.String pattern = (System.String) object2;
System.String target = (System.String) object1;
if (object1 == null)
{
return false;
}
//TODO: possibly use a WeakHashMap cache of regex expressions
//downside is could cause a lot of hashing if the patterns are dynamic
//if the patterns are static, then it will not be a problem. Perhaps compiler can recognise patterns
//in the input string using /pattern/ etc.. and precompile it, in which case object2 will be a Pattern.
return target.Equals(pattern); // target.matches(pattern);
}
public virtual System.String toString()
{
return "String !=";
}
}
}
}
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