// This is safe because of the type checking
@SuppressWarnings("unchecked")
private SkylarkNestedSet(
Order order,
SkylarkType contentType,
Object item,
Location loc,
List<Object> items,
List<NestedSet<Object>> transitiveItems)
throws EvalException {
// Adding the item
if (item instanceof SkylarkNestedSet) {
SkylarkNestedSet nestedSet = (SkylarkNestedSet) item;
if (!nestedSet.isEmpty()) {
contentType = checkType(contentType, nestedSet.contentType, loc);
transitiveItems.add((NestedSet<Object>) nestedSet.set);
}
} else if (item instanceof SkylarkList) {
// TODO(bazel-team): we should check ImmutableList here but it screws up genrule at line 43
for (Object object : (SkylarkList) item) {
contentType = checkType(contentType, SkylarkType.of(object.getClass()), loc);
checkImmutable(object, loc);
items.add(object);
}
} else {
throw new EvalException(
loc,
String.format("cannot add value of type '%s' to a set", EvalUtils.getDataTypeName(item)));
}
this.contentType = Preconditions.checkNotNull(contentType, "type cannot be null");
// Initializing the real nested set
NestedSetBuilder<Object> builder = new NestedSetBuilder<>(order);
builder.addAll(items);
try {
for (NestedSet<Object> nestedSet : transitiveItems) {
builder.addTransitive(nestedSet);
}
} catch (IllegalStateException e) {
throw new EvalException(loc, e.getMessage());
}
this.set = builder.build();
this.items = ImmutableList.copyOf(items);
this.transitiveItems = ImmutableList.copyOf(transitiveItems);
}
/**
* A not type safe constructor for SkylarkNestedSet, specifying type as a Java class. It's
* discouraged to use it unless type generic safety is guaranteed from the caller side.
*/
public SkylarkNestedSet(Class<?> contentType, NestedSet<?> set) {
this(SkylarkType.of(contentType), set);
}
/** Returns a type safe SkylarkNestedSet. Use this instead of the constructor if possible. */
public static <T> SkylarkNestedSet of(Class<T> contentType, NestedSet<T> set) {
return of(SkylarkType.of(contentType), set);
}