public Exp validate(Exp exp, boolean scalar) {
Exp resolved;
try {
resolved = (Exp) resolvedNodes.get(exp);
} catch (ClassCastException e) {
// A classcast exception will occur if there is a String
// placeholder in the map. This is an internal error -- should
// not occur for any query, valid or invalid.
throw Util.newInternal(
e, "Infinite recursion encountered while validating '" + Util.unparse(exp) + "'");
}
if (resolved == null) {
try {
stack.push((QueryPart) exp);
// To prevent recursion, put in a placeholder while we're
// resolving.
resolvedNodes.put((QueryPart) exp, placeHolder);
resolved = exp.accept(this);
Util.assertTrue(resolved != null);
resolvedNodes.put((QueryPart) exp, (QueryPart) resolved);
} finally {
stack.pop();
}
}
if (scalar) {
final Type type = resolved.getType();
if (!TypeUtil.canEvaluate(type)) {
String exprString = Util.unparse(resolved);
throw MondrianResource.instance().MdxMemberExpIsSet.ex(exprString);
}
}
return resolved;
}
@Override
public void accept(GrammarItemVisitor visitor) {
visitor.visitAssignStm(this);
if (exp.handleProceedWith(visitor)) {
exp.accept(visitor);
}
visitor.leaveAssignStm(this);
}
/**
* {@inheritDoc}
*
* <p>Overriding isJoinRequired() for native filters because we have to force a join to the fact
* table if the filter expression references a measure.
*/
protected boolean isJoinRequired() {
// Use a visitor and check all member expressions.
// If any of them is a measure, we will have to
// force the join to the fact table. If it is something
// else then we don't really care. It will show up in
// the evaluator as a non-all member and trigger the
// join when we call RolapNativeSet.isJoinRequired().
final AtomicBoolean mustJoin = new AtomicBoolean(false);
filterExpr.accept(
new MdxVisitorImpl() {
public Object visit(MemberExpr memberExpr) {
if (memberExpr.getMember().isMeasure()) {
mustJoin.set(true);
return null;
}
return super.visit(memberExpr);
}
});
return mustJoin.get() || (getEvaluator().isNonEmpty() && super.isJoinRequired());
}
