/// <summary>
/// Visits a binary expression, returning a rewritten expression if supported.
/// </summary>
/// <param name="expression">The expression.</param>
/// <returns></returns>
/// <remarks></remarks>
protected override Expression VisitBinaryExpression(BinaryExpression expression)
{
var left = expression.Left;
var right = expression.Right;
//if (RebelExpressionRewriter.IsConvertibleBinary(expression))
// return RebelExpressionRewriter.ConvertToFieldEvaluationExpression(expression);
if (FieldPredicateExpressionRewriter.IsConvertibleBinary(expression, StructureBinder))
{
return(FieldPredicateExpressionRewriter.ConvertToFieldPredicate(expression, StructureBinder));
}
//else make a new binary with the results of visiting deeper in the tree
var visitedLeft = VisitExpression(left);
var visitedRight = VisitExpression(right);
return(Expression.MakeBinary(expression.NodeType, visitedLeft, visitedRight, expression.IsLiftedToNull, expression.Method));
}
protected override Expression VisitUnaryExpression(UnaryExpression expression)
{
// The only type of Unary that we support is "Not", i.e. reversing the inner expression
if (expression.NodeType == ExpressionType.Not)
{
var output = VisitExpression(expression.Operand);
if (typeof(FieldPredicateExpression).IsAssignableFrom(output.GetType()))
{
return(FieldPredicateExpressionRewriter.NegateFieldPredicate(output as FieldPredicateExpression));
}
}
if (expression.NodeType == ExpressionType.Convert &&
(expression.Type == typeof(object) || IsDynamicMemberGetter(expression.Operand)))
{
return(expression.Operand);
}
return(base.VisitUnaryExpression(expression));
}
private FieldSelectorExpression GetFieldSelector(QueryModel queryModel, Expression predicate)
{
return(FieldPredicateExpressionRewriter.GetFieldSelector(predicate, _treeVisitor.StructureBinder));
}
