org.springframework.data.mongodb.core.convert

Class DefaultDbRefResolver

java.lang.Object

org.springframework.data.mongodb.core.convert.DefaultDbRefResolver

All Implemented Interfaces:

DbRefResolver

public class DefaultDbRefResolver
extends Object
implements DbRefResolver

A DbRefResolver that resolves DBRefs by delegating to a DbRefResolverCallback than is able to generate lazy loading proxies.

Since:

1.4

Author:

Thomas Darimont, Oliver Gierke, Christoph Strobl

Constructor Summary

Constructors

Constructor and Description
DefaultDbRefResolver(MongoDbFactory mongoDbFactory) Creates a new DefaultDbRefResolver with the given MongoDbFactory.

Method Summary

Modifier and Type	Method and Description
List<com.mongodb.DBObject>	bulkFetch(List<com.mongodb.DBRef> refs) Loads a given List of DBRefs from the datasource in one batch.
com.mongodb.DBRef	createDbRef(DBRef annotation, MongoPersistentEntity<?> entity, Object id) Creates a DBRef instance for the given DBRef annotation, MongoPersistentEntity and id.
com.mongodb.DBObject	fetch(com.mongodb.DBRef dbRef) Actually loads the DBRef from the datasource.
Object	resolveDbRef(MongoPersistentProperty property, com.mongodb.DBRef dbref, DbRefResolverCallback callback, DbRefProxyHandler handler) Resolves the given DBRef into an object of the given MongoPersistentProperty's type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultDbRefResolver

public DefaultDbRefResolver(MongoDbFactory mongoDbFactory)

Creates a new DefaultDbRefResolver with the given MongoDbFactory.

Parameters:

mongoDbFactory - must not be null.

Method Detail

resolveDbRef

public Object resolveDbRef(MongoPersistentProperty property,
                           com.mongodb.DBRef dbref,
                           DbRefResolverCallback callback,
                           DbRefProxyHandler handler)

Description copied from interface: DbRefResolver

Resolves the given DBRef into an object of the given MongoPersistentProperty's type. The method might return a proxy object for the DBRef or resolve it immediately. In both cases the DbRefResolverCallback will be used to obtain the actual backing object.

Specified by:

resolveDbRef in interface DbRefResolver

Parameters:

property - will never be null.

dbref - the DBRef to resolve.

callback - will never be null.

Returns:

createDbRef

public com.mongodb.DBRef createDbRef(DBRef annotation,
                                     MongoPersistentEntity<?> entity,
                                     Object id)

Description copied from interface: DbRefResolver

Creates a DBRef instance for the given DBRef annotation, MongoPersistentEntity and id.

Specified by:

createDbRef in interface DbRefResolver

Parameters:

annotation - will never be null.

entity - will never be null.

id - will never be null.

Returns:

fetch

public com.mongodb.DBObject fetch(com.mongodb.DBRef dbRef)

Description copied from interface: DbRefResolver

Actually loads the DBRef from the datasource.

Specified by:

fetch in interface DbRefResolver

Parameters:

dbRef - must not be null.

Returns:

bulkFetch

public List<com.mongodb.DBObject> bulkFetch(List<com.mongodb.DBRef> refs)

Description copied from interface: DbRefResolver

Loads a given List of DBRefs from the datasource in one batch. The resulting List of DBObject will reflect the ordering of the DBRef passed in.
The DBRef elements in the list must not reference different collections.

Specified by:

bulkFetch in interface DbRefResolver

Parameters:

refs - must not be null.

Returns:

never null.