public ISqlFragment Build(WhereClause clause)
{
_holder = this;
Where = null;
Visit(clause.Predicate);
if (Where == null)
{
throw new BadLinqExpressionException($"Unsupported Where clause: '{clause.Predicate}'");
}
return(Where);
}
protected override Expression VisitUnary(UnaryExpression node)
{
if (node.NodeType == ExpressionType.Not)
{
var original = _holder;
_holder = new NotWhereFragment(original);
var returnValue = Visit(node.Operand);
_holder = original;
return(returnValue);
}
return(base.VisitUnary(node));
}
private void buildCompoundWhereFragment(BinaryExpression node, string separator)
{
var original = _holder;
var compound = CompoundWhereFragment.For(separator);
_holder.Register(compound);
_holder = compound;
Visit(node.Left);
_holder = compound;
Visit(node.Right);
_holder = original;
}
protected override Expression VisitUnary(UnaryExpression node)
{
if (node.NodeType == ExpressionType.Not)
{
var original = _holder;
if (original is IReversibleWhereFragment r)
{
_holder.Register(r.Reverse());
return(Visit(node.Operand));
}
else
{
_holder = new NotWhereFragment(original);
var returnValue = Visit(node.Operand);
_holder = original;
return(returnValue);
}
}
return(base.VisitUnary(node));
}
public WhereClauseParser(IMartenSession session, Statement statement)
{
_session = session;
_statement = statement;
_holder = this;
}
public NotWhereFragment(IWhereFragmentHolder parent)
{
_parent = parent;
}
