private void AddLogicalOperator(AdoQueryPayload queryPayload, DslLogicalOperator logicalOperator)
{
if (logicalOperator == DslLogicalOperator.And)
{
queryPayload.Append("AND ");
}
else if (logicalOperator == DslLogicalOperator.Or)
{
queryPayload.Append("OR ");
}
}
public static Expression <Func <T, bool> > BuildExpression <T>(this IEnumerable <T> source, IList <MatchCondition> conditions, ParameterExpression pe = null)
{
Expression <Func <T, bool> > returnCondition = null;
Expression cond1 = null;
Expression currentCond = null;
DslLogicalOperator currentOperator = DslLogicalOperator.NotDefined;
if (pe == null)
{
pe = Expression.Parameter(typeof(T), "s");
}
foreach (var x in conditions)
{
switch (x.Operator)
{
case DslOperator.Like:
currentCond = Expression.Call(typeof(LinqExtension).GetMethod("RegexMatch", new Type[] { typeof(string), typeof(string) }), new Expression[] {
GetExpressionFromIValue(pe, x.Value1, typeof(string)),
GetExpressionFromIValue(pe, x.Value2, typeof(string))
});
break;
case DslOperator.Is:
if (!(x.Value1 is VariableValue))
{
throw new ArgumentException("Left Side Value of IS must be a Variable");
}
if ((x.Value2 as NullValue).value != null)
{
throw new ArgumentException("IS Operator only Supports NULL");
}
currentCond = Expression.Equal(Expression.Convert(GetExpressionFromIValue(pe, x.Value1, GetTargetType(x, typeof(T))), typeof(object)), Expression.Constant(null));
break;
case DslOperator.In:
currentCond = Expression.Call(typeof(LinqExtension).GetMethod("InMethod"), new Expression[] {
GetExpressionFromIValue(pe, x.Value1, typeof(string)),
GetExpressionFromIValue(pe, x.Value2, typeof(IList <string>))
});
break;
case DslOperator.NotEquals:
currentCond = Expression.NotEqual(GetExpressionFromIValue(pe, x.Value1, GetTargetType(x, typeof(T))), GetExpressionFromIValue(pe, x.Value2, GetTargetType(x, typeof(T))));
//currentCond = Expression.NotEqual(Expression.Property(pe, x.VariableName), Expression.Constant(GetStringAsObject(x.Value, GetPropertType(x.VariableName, typeof(T)))));
break;
case DslOperator.Equals:
currentCond = Expression.Equal(GetExpressionFromIValue(pe, x.Value1, GetTargetType(x, typeof(T))), GetExpressionFromIValue(pe, x.Value2, GetTargetType(x, typeof(T))));
//currentCond = Expression.Equal(Expression.Property(pe, x.VariableName), Expression.Constant(GetStringAsObject(x.Value, GetPropertType(x.VariableName, typeof(T)))));
break;
case DslOperator.Greater:
currentCond = Expression.GreaterThan(GetExpressionFromIValue(pe, x.Value1, GetTargetType(x, typeof(T))), GetExpressionFromIValue(pe, x.Value2, GetTargetType(x, typeof(T))));
//currentCond = Expression.GreaterThan(Expression.Property(pe, x.VariableName), Expression.Constant(GetStringAsObject(x.Value, GetPropertType(x.VariableName, typeof(T)))));
break;
case DslOperator.GreaterOrEqual:
currentCond = Expression.GreaterThanOrEqual(GetExpressionFromIValue(pe, x.Value1, GetTargetType(x, typeof(T))), GetExpressionFromIValue(pe, x.Value2, GetTargetType(x, typeof(T))));
//currentCond = Expression.GreaterThanOrEqual(Expression.Property(pe, x.VariableName), Expression.Constant(GetStringAsObject(x.Value, GetPropertType(x.VariableName, typeof(T)))));
break;
case DslOperator.Lower:
currentCond = Expression.LessThan(GetExpressionFromIValue(pe, x.Value1, GetTargetType(x, typeof(T))), GetExpressionFromIValue(pe, x.Value2, GetTargetType(x, typeof(T))));
//currentCond = Expression.LessThan(Expression.Property(pe, x.VariableName), Expression.Constant(GetStringAsObject(x.Value, GetPropertType(x.VariableName, typeof(T)))));
break;
case DslOperator.LowerOrEqual:
currentCond = Expression.LessThanOrEqual(GetExpressionFromIValue(pe, x.Value1, GetTargetType(x, typeof(T))), GetExpressionFromIValue(pe, x.Value2, GetTargetType(x, typeof(T))));
//currentCond = Expression.LessThanOrEqual(Expression.Property(pe, x.VariableName), Expression.Constant(GetStringAsObject(x.Value, GetPropertType(x.VariableName, typeof(T)))));
break;
case DslOperator.OpenParenthesis:
currentCond = BuildExpression(source, x.SubConditions, pe).Body;
break;
}
if (x.Not)
{
currentCond = Expression.Not(currentCond);
}
if (currentOperator == DslLogicalOperator.And)
{
currentCond = Expression.AndAlso(cond1, currentCond);
}
else if (currentOperator == DslLogicalOperator.Or)
{
currentCond = Expression.OrElse(cond1, currentCond);
}
cond1 = currentCond;
currentOperator = x.NextLogOperator;
}
returnCondition = Expression.Lambda <Func <T, bool> >(currentCond, new[] { pe });
return(returnCondition);
}
