问题描述
是否可以在接口或表象类或它们的字段上从SpringData Neo4j
添加@NodeEntity
(甚至是@RelationshipEntity
)注释?如果没有,您如何处理这些情况?
Is it possible to add @NodeEntity
(or even @RelationshipEntity
) annotation from SpringData Neo4j
on an interface or abstact class or their fields? If not, how do you manage these situations?
推荐答案
您当然可以在Abstract classes
上执行此操作,在某些常见情况下,我认为这是一个好习惯.让我给你一个我在图形模型中使用的例子:
Definitely you can do that on Abstract classes
, and I think it's a good practice in some common cases. Let me give you an example that I'm using in my graph model:
@NodeEntity
public abstract class BasicNodeEntity implements Serializable {
@GraphId
private Long nodeId;
public Long getNodeId() {
return nodeId;
}
@Override
public abstract boolean equals(Object o);
@Override
public abstract int hashCode();
}
public abstract class IdentifiableEntity extends BasicNodeEntity {
@Indexed(unique = true)
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof IdentifiableEntity)) return false;
IdentifiableEntity entity = (IdentifiableEntity) o;
if (id != null ? !id.equals(entity.id) : entity.id != null) return false;
return true;
}
@Override
public int hashCode() {
return id != null ? id.hashCode() : 0;
}
}
可识别实体的示例.
public class User extends IdentifiableEntity {
private String firstName;
// ...
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
}
据我所知,
OTOH,如果用@NodeEntity
注释接口,则实现该接口的那些类不要继承该注释.为了确保我已经进行了测试以检查它并明确地spring-data-neo4j
引发了异常,因为它既不能识别继承的类,也不能识别NodeEntity
或RelationshipEntity
.
OTOH, as far as I know, if you annotate an interface with @NodeEntity
, those classes who implement the interface DON'T inherite the annotation. To be sure I've made a test to check it and definately spring-data-neo4j
throws an Exception because don't recognize the inherited class neither an NodeEntity
nor a RelationshipEntity
.
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'neo4jMappingContext' defined in class org.springframework.data.neo4j.config.Neo4jConfiguration: Invocation of init method failed; nested exception is org.springframework.data.neo4j.mapping.InvalidEntityTypeException: Type class com.xxx.yyy.rest.user.domain.User is neither a @NodeEntity nor a @RelationshipEntity
希望有帮助
这篇关于在接口/抽象类上使用@NodeEntity的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!