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//
// Expressions.cs
//
// Author:
// Juraj Skripsky (juraj@hotfeet.ch)
//
// (C) 2004 HotFeet GmbH (http://www.hotfeet.ch)
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Data.Common;
using System.Collections;
using System.Data;
namespace Mono.Data.SqlExpressions {
internal interface IExpression {
object Eval (DataRow row);
bool DependsOn(DataColumn other);
bool EvalBoolean (DataRow row);
void ResetExpression ();
}
internal abstract class BaseExpression : IExpression {
public abstract object Eval (DataRow row);
public abstract bool DependsOn(DataColumn other);
public virtual bool EvalBoolean (DataRow row)
{
throw new EvaluateException ("Not a Boolean Expression");
}
public override bool Equals(object obj)
{
if (obj == null || !(obj is BaseExpression))
return false;
return true;
}
public override int GetHashCode()
{
return 0;
}
public virtual void ResetExpression ()
{
}
}
// abstract base classes
internal abstract class UnaryExpression : BaseExpression {
protected IExpression expr;
public override bool Equals(object obj)
{
if (!base.Equals (obj))
return false;
if (!(obj is UnaryExpression))
return false;
UnaryExpression other = (UnaryExpression) obj;
if (!other.expr.Equals (expr))
return false;
return true;
}
public override int GetHashCode()
{
return base.GetHashCode () ^ expr.GetHashCode ();
}
public UnaryExpression (IExpression e)
{
expr = e;
}
override public bool DependsOn(DataColumn other) {
return expr.DependsOn(other);
}
override public bool EvalBoolean (DataRow row)
{
return (bool) Eval (row);
}
}
internal abstract class BinaryExpression : BaseExpression {
protected IExpression expr1, expr2;
public override bool Equals(object obj)
{
if (!base.Equals (obj))
return false;
if (!(obj is BinaryExpression))
return false;
BinaryExpression other = (BinaryExpression) obj;
if (!other.expr1.Equals (expr1) || !other.expr2.Equals (expr2))
return false;
return true;
}
public override int GetHashCode()
{
int hashCode = base.GetHashCode ();
hashCode ^= expr1.GetHashCode ();
hashCode ^= expr2.GetHashCode ();
return hashCode;
}
protected BinaryExpression (IExpression e1, IExpression e2)
{
expr1 = e1;
expr2 = e2;
}
override public bool DependsOn(DataColumn other)
{
return expr1.DependsOn(other) || expr2.DependsOn(other);
}
override public void ResetExpression ()
{
expr1.ResetExpression ();
expr2.ResetExpression ();
}
}
internal enum Operation {
AND, OR,
EQ, NE, LT, LE, GT, GE,
ADD, SUB, MUL, DIV, MOD
}
internal abstract class BinaryOpExpression : BinaryExpression {
protected Operation op;
public override bool Equals(object obj)
{
if (!base.Equals (obj))
return false;
if (!(obj is BinaryOpExpression))
return false;
BinaryOpExpression other = (BinaryOpExpression) obj;
if (other.op != op)
return false;
return true;
}
public override int GetHashCode()
{
return base.GetHashCode () ^ op.GetHashCode ();
}
protected BinaryOpExpression (Operation op, IExpression e1, IExpression e2) : base (e1, e2)
{
this.op = op;
}
}
}
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