ObjectXmlReader.java 文件源码

@Override
protected AttributeReadingStrategy caseJavaIdentityRefAttribute(final 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(getLastAttribute().getNullableDefault(), mappingKey,
            identityMap);
}