JpaResourceFieldInformationProvider.java 文件源码

@Override
public Optional<ResourceFieldType> getFieldType(BeanAttributeInformation attributeDesc) {
    Optional<OneToOne> oneToOne = attributeDesc.getAnnotation(OneToOne.class);
    Optional<OneToMany> oneToMany = attributeDesc.getAnnotation(OneToMany.class);
    Optional<ManyToOne> manyToOne = attributeDesc.getAnnotation(ManyToOne.class);
    Optional<ManyToMany> manyToMany = attributeDesc.getAnnotation(ManyToMany.class);
    if (oneToOne.isPresent() || oneToMany.isPresent() || manyToOne.isPresent() || manyToMany.isPresent()) {
        return Optional.of(ResourceFieldType.RELATIONSHIP);
    }

    Optional<Id> id = attributeDesc.getAnnotation(Id.class);
    Optional<EmbeddedId> embeddedId = attributeDesc.getAnnotation(EmbeddedId.class);
    if (id.isPresent() || embeddedId.isPresent()) {
        return Optional.of(ResourceFieldType.ID);
    }
    return Optional.empty();
}