public override void Handle(UnaryExpression expression, VisitorContext context)
{
context.Visit(expression.Operand);
var val = context.GetResult();
var result = new QueryObject();
result.Add("$not", val);
context.SetResult(result);
}
public override void Handle(MethodCallExpression expression, VisitorContext context)
{
context.Visit(expression.Arguments[1]);
var matchCriteria = context.GetResult();
var regex = new QueryObject {
{ "$elemMatch", matchCriteria }
};
var query = CreateQuery(expression.Arguments[0], regex, context);
context.SetResult(query);
}
public override void Handle(BinaryExpression expression, VisitorContext context)
{
var isAnd = expression.NodeType == ExpressionType.AndAlso ||
expression.NodeType == ExpressionType.And;
context.Visit(expression.Left);
context.Visit(expression.Right);
var right = context.GetResult();
var left = context.GetResult();
var @operator = isAnd
? "$and"
: "$or";
var query = new QueryObject {
{ @operator, new List <IDictionary <string, object> > {
left, right
} }
};
context.SetResult(query);
}