private Set<String> extractVars(String query) {
log.debug(" {}", query);
Query q = QueryFactory.create(query);
Element element = q.getQueryPattern();
ElementWalker.walk(element, collector);
Set<String> vars = collector.getVariables();
log.debug(" > {}", vars);
return vars;
}
/**
* This method constructs {@link VariablePair} list with old and numeric ones
*
* @param query
* @param finalIndex
*/
private static List<VariablePair> constructVariablePairs(Query query, final int finalIndex) {
final List<VariablePair> variablePairs = new ArrayList<VariablePair>();
ElementVisitorBase visitor =
new ElementVisitorBase() {
@Override
public void visit(ElementFilter el) {
Set<Var> varsMentioned = el.getExpr().getVarsMentioned();
for (Var var : varsMentioned) {
Node numericVariable = Var.createVariable(var.getName() + "_" + finalIndex);
variablePairs.add(new VariablePair(var.getName(), numericVariable.getName()));
}
super.visit(el);
}
};
ElementWalker.walk(query.getQueryPattern(), visitor);
return variablePairs;
}