@NotNull
@SuppressWarnings("unchecked")
public static <D extends CallableDescriptor> Set<D> getAllOverriddenDescriptors(@NotNull D f) {
Set<D> result = new LinkedHashSet<D>();
collectAllOverriddenDescriptors((D) f.getOriginal(), result);
return result;
}
private static <D extends CallableDescriptor> void collectAllOverriddenDescriptors(
@NotNull D current, @NotNull Set<D> result) {
if (result.contains(current)) return;
for (CallableDescriptor callableDescriptor : current.getOriginal().getOverriddenDescriptors()) {
@SuppressWarnings("unchecked")
D descriptor = (D) callableDescriptor;
collectAllOverriddenDescriptors(descriptor, result);
result.add(descriptor);
}
}
/** @return whether f overrides g */
public static <D extends CallableDescriptor> boolean overrides(@NotNull D f, @NotNull D g) {
// In a multi-module project different "copies" of the same class may be present in different
// libraries,
// that's why we use structural equivalence for members (DescriptorEquivalenceForOverrides).
// This first check cover the case of duplicate classes in different modules:
// when B is defined in modules m1 and m2, and C (indirectly) inherits from both versions,
// we'll be getting sets of members that do not override each other, but are structurally
// equivalent.
// As other code relies on no equal descriptors passed here, we guard against f == g, but this
// may not be necessary
// Note that this is needed for the usage of this function in the IDE code
if (!f.equals(g)
&& DescriptorEquivalenceForOverrides.INSTANCE.areEquivalent(
f.getOriginal(), g.getOriginal())) return true;
CallableDescriptor originalG = g.getOriginal();
for (D overriddenFunction : DescriptorUtils.getAllOverriddenDescriptors(f)) {
if (DescriptorEquivalenceForOverrides.INSTANCE.areEquivalent(originalG, overriddenFunction))
return true;
}
return false;
}