/**
* Returns the upper bound of a type if it has one, or the type itself if not. Correctly handles
* wildcards and capture variables.
*/
public static Type getUpperBound(Type type, Types types) {
if (type.hasTag(TypeTag.WILDCARD)) {
return types.wildUpperBound(type);
}
if (type.hasTag(TypeTag.TYPEVAR) && ((TypeVar) type).isCaptured()) {
return types.cvarUpperBound(type);
}
if (type.getUpperBound() != null) {
return type.getUpperBound();
}
// concrete type, e.g. java.lang.String, or a case we haven't considered
return type;
}
/**
* This routine applies following mappings: - if input type is primitive, apply numeric
* promotion - if input type is either 'void', 'null' or 'String' leave it untouched - otherwise
* return 'Object'
*/
private Type stringPromotion(Type t) {
if (t.isPrimitive()) {
return unaryPromotion(t);
} else if (t.hasTag(TypeTag.VOID)
|| t.hasTag(TypeTag.BOT)
|| types.isSameType(t, syms.stringType)) {
return t;
} else if (t.hasTag(TypeTag.TYPEVAR)) {
return stringPromotion(t.getUpperBound());
} else {
return syms.objectType;
}
}