com.jmethods.catatumbo

Class MapperFactory

java.lang.Object

com.jmethods.catatumbo.MapperFactory

public class MapperFactory
extends Object

A factory for producing data mappers that are used for mapping fields of model class to/from the Cloud Datastore.

Author:

Sai Pullabhotla

Method Summary

Modifier and Type	Method and Description
static MapperFactory	getInstance() Returns the singleton instance of this MapperFactory.
Mapper	getMapper(Field field) Returns the mapper for the given field.
Mapper	getMapper(Type type) Returns a mapper for the given type.
void	setDefaultMapper(Type type, Mapper mapper) Sets or registers the given mapper for the given type.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static MapperFactory getInstance()

Returns the singleton instance of this MapperFactory.

Returns:

the singleton instance of this MapperFactory.

getMapper

public Mapper getMapper(Field field)

Returns the mapper for the given field. If the field has a custom mapper, a new instance of the specified mapper will be created and returned. Otherwise, one of the built-in mappers will be returned based on the field type.

Parameters:

field - the field

Returns:

the mapper for the given field.

getMapper

public Mapper getMapper(Type type)

Returns a mapper for the given type. If a mapper that can handle given type exists in the cache, it will be returned. Otherwise, a new mapper will be created.

Parameters:

type - the type of field in the model class

Returns:

a Mapper that is capable of mapping the given type.

setDefaultMapper

public void setDefaultMapper(Type type,
                             Mapper mapper)

Sets or registers the given mapper for the given type. This method must be called before performing any persistence operations, preferrably, during application startup. Entities that were introspected before calling this method will NOT use the new mapper.

Parameters:

type - the type

mapper - the mapper to use for the given type