+ @Override
+ protected AttributeReadingStrategy caseJavaIdentityRefAttribute(OpenType<?> openType) {
+ Preconditions.checkState(openType instanceof CompositeType);
+ Set<String> keys = ((CompositeType) openType).keySet();
+ Preconditions.checkState(keys.size() == 1, "Unexpected number of elements for open type %s, should be 1", openType);
+ String mappingKey = keys.iterator().next();
+ return new SimpleIdentityRefAttributeReadingStrategy(lastAttribute.getNullableDefault(), mappingKey, identityMap);
+ }
+