public static <From, To> To aggregate(
IEntityDefn primary,
IEntityDefnFoldVisitor<From, To> visitor,
IAggregator<From, To> aggregator) {
aggregator.add(visitor.acceptPrimary(primary));
visitChildren(primary, visitor, aggregator);
return aggregator.result();
}
public static <From, To> To fold(
IEntityDefn primary,
To initial,
IEntityDefnFoldVisitor<From, To> visitor,
IFoldFunction<From, To> foldFunction) {
To accumulator = foldFunction.apply(visitor.acceptPrimary(primary), initial);
return visitChildren(primary, accumulator, visitor, foldFunction);
}
private static <To, From> void visitChildren(
IEntityDefn parent,
IEntityDefnFoldVisitor<From, To> visitor,
IAggregator<From, To> aggregator) {
for (IEntityDefn child : parent.getChildren()) {
aggregator.add(visitor.acceptChild(parent, child));
visitChildren(child, visitor, aggregator);
}
}
private static <To, From> To visitChildren(
IEntityDefn parent,
To initial,
IEntityDefnFoldVisitor<From, To> visitor,
IFoldFunction<From, To> foldFunction) {
To accumulator = initial;
for (IEntityDefn child : parent.getChildren()) {
accumulator = foldFunction.apply(visitor.acceptChild(parent, child), accumulator);
accumulator = visitChildren(parent, accumulator, visitor, foldFunction);
}
return accumulator;
}
