/**
* Generate MDX Expression
*
* @return
*/
public Exp generate() {
Exp exp = null;
List<TreeNode<Exp>> nodes = rootNode.getChildren();
// single members (nDimension = 1) are enclosed in set brackets
// collect single members
List<Exp> openSet = new ArrayList<Exp>();
// loop over top level nodes
for (TreeNode<Exp> node : nodes) {
Exp expForNode = genExpForNode(node, nDimension);
boolean closeOpenSet = false;
if (nDimension == 1) {
if (quaxUtil.isMember(expForNode)) {
openSet.add(expForNode);
continue;
} else {
closeOpenSet = true;
}
} else {
if (quaxUtil.isFunCallTo(expForNode, "()")) {
openSet.add(expForNode);
continue;
} else {
closeOpenSet = true;
}
}
if (closeOpenSet && !openSet.isEmpty()) {
// close open set
Exp set = new FunCall("{}", Syntax.Braces, openSet);
if (exp == null) {
exp = set;
} else {
// generate Union
FunCall call = new FunCall("Union", Syntax.Function);
call.getArgs().add(exp);
call.getArgs().add(set);
exp = call;
}
openSet.clear();
}
if (exp == null) {
exp = expForNode;
} else {
// generate Union of Exp and expForNode
FunCall call = new FunCall("Union", Syntax.Function);
call.getArgs().add(exp);
call.getArgs().add(expForNode);
exp = call;
}
}
if (!openSet.isEmpty()) {
// close open set
Exp set = new FunCall("{}", Syntax.Braces, openSet);
if (exp == null) {
exp = set;
} else {
// generate Union
FunCall call = new FunCall("Union", Syntax.Function);
call.getArgs().add(exp);
call.getArgs().add(set);
exp = call;
}
openSet.clear();
}
return exp;
}