private <N> N getSingleValuedAttribute(
final AttributeDescription attributeDescription,
final Function<ByteString, N, NeverThrowsException> function) {
final Attribute attr = entry.getAttribute(attributeDescription);
if (attr == null || attr.isEmpty()) {
return null;
} else {
return function.apply(attr.firstValue());
}
}
@Override
public KO getKey() {
if (cachedTransformedKey == null) {
try {
cachedTransformedKey = keyTransformer.apply(input.getKey());
} catch (Exception e) {
throw new TransformationException(e, input.getKey(), input.getValue());
}
}
return cachedTransformedKey;
}
/** {@inheritDoc} */
@Override
@SuppressWarnings("unchecked")
public boolean remove(final Object o) {
return collection.remove(funcNtoM.apply((N) o));
}
/** {@inheritDoc} */
@Override
public boolean add(final N e) {
return collection.add(funcNtoM.apply(e));
}