private IQuery ProcessNode(AstNode root, IQuery qyInput) {
IQuery result = null;
if (root == null)
return null;
switch (root.TypeOfAst) {
case AstNode.QueryType.Axis:
Axis axis = (Axis)root;
result = ProcessAxis(axis, ProcessNode(axis.Input, qyInput));
break;
case AstNode.QueryType.Operator:
result = ProcessOperator((Operator)root, null);
break;
case AstNode.QueryType.Filter:
result = ProcessFilter((Filter)root);
break;
case AstNode.QueryType.ConstantOperand:
result = ProcessOperand((Operand)root);
break;
case AstNode.QueryType.Function:
result = ProcessFunction((Function)root, qyInput);
break;
case AstNode.QueryType.Root:
result = new AbsoluteQuery();
break;
case AstNode.QueryType.Group:
result = new GroupQuery(ProcessNode(((Group)root).GroupNode, qyInput));
break;
default:
Debug.Assert(false, "Unknown QueryType encountered!!");
break;
}
return result;
}