Package com.google.cloud.spring.data.datastore.core.convert

Class TwoStepsConversions

java.lang.Object

com.google.cloud.spring.data.datastore.core.convert.TwoStepsConversions

All Implemented Interfaces:

ReadWriteConversions

public class TwoStepsConversions
extends Object
implements ReadWriteConversions

In order to support CustomConversions, this class applies 2-step conversions. The first step produces one of SimpleTypeHolder's simple types. The second step converts simple types to Datastore-native types. The second step is skipped if the first one produces a Datastore-native type.

Since:

1.1

Constructor Summary

Constructors

Constructor	Description
TwoStepsConversions(org.springframework.data.convert.CustomConversions customConversions, ObjectToKeyFactory objectToKeyFactory, DatastoreMappingContext datastoreMappingContext)

Method Summary

Modifier and Type	Method	Description
<T> T	convertCollection(Object collection, Class<?> target)
<T> T	convertOnRead(Object val, EmbeddedType embeddedType, org.springframework.data.util.TypeInformation targetTypeInformation)	Converts a given object to an object of a target type that is possibly an embedded entity.
<T> T	convertOnRead(Object val, Class targetCollectionType, Class targetComponentType)	Converts a given object to an object of a target type.
com.google.cloud.datastore.Value	convertOnWrite(Object proppertyVal, DatastorePersistentProperty persistentProperty)	Converts an object to a Cloud Datastore Value; supports collections.
com.google.cloud.datastore.Value	convertOnWriteSingle(Object propertyVal)	Converts an object to a Cloud Datastore Value, for non-collection objects.
Optional<Class<?>>	getDatastoreCompatibleType(Class inputType)	Get the Cloud Datastore-compatible native Java type that can be used to store the given type.
void	registerEntityConverter(DatastoreEntityConverter datastoreEntityConverter)	Registers DatastoreEntityConverter to be used for embedded entities.

Methods inherited from class java.lang.Object

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

Constructor Details

TwoStepsConversions

public TwoStepsConversions(org.springframework.data.convert.CustomConversions customConversions,
 ObjectToKeyFactory objectToKeyFactory,
 DatastoreMappingContext datastoreMappingContext)

Method Details

convertOnRead

public <T> T convertOnRead(Object val,
 Class targetCollectionType,
 Class targetComponentType)

Description copied from interface: ReadWriteConversions

Converts a given object to an object of a target type.

Specified by:

convertOnRead in interface ReadWriteConversions

Type Parameters:

T - the type of the object that is produced by reading

Parameters:

val - the simple type or Iterable value to convert. Arrays are not supported.

targetCollectionType - the type of the collection to be converted into. null if the property is a singular object.

targetComponentType - the type of the property to convert. For collection-like properties this refers to the individual items' type.

Returns:

an object of a target type.

convertOnRead

public <T> T convertOnRead(Object val,
 EmbeddedType embeddedType,
 org.springframework.data.util.TypeInformation targetTypeInformation)

Description copied from interface: ReadWriteConversions

Converts a given object to an object of a target type that is possibly an embedded entity.

Specified by:

convertOnRead in interface ReadWriteConversions

Type Parameters:

T - the type of the object that is produced by reading

Parameters:

val - the simple type or Iterable value to convert. Arrays are not supported.

embeddedType - contains the type of embedded entity conversion should produce.

targetTypeInformation - type metadata information for the desired type.

Returns:

an object of a target type.

convertOnWrite

public com.google.cloud.datastore.Value convertOnWrite(Object proppertyVal,
 DatastorePersistentProperty persistentProperty)

Description copied from interface: ReadWriteConversions

Converts an object to a Cloud Datastore Value; supports collections.

Specified by:

convertOnWrite in interface ReadWriteConversions

Parameters:

proppertyVal - the objects to convert.

persistentProperty - the source field information.

Returns:

a Cloud Datastore value.

convertOnWriteSingle

public com.google.cloud.datastore.Value convertOnWriteSingle(Object propertyVal)

Description copied from interface: ReadWriteConversions

Converts an object to a Cloud Datastore Value, for non-collection objects.

Specified by:

convertOnWriteSingle in interface ReadWriteConversions

Parameters:

propertyVal - the object to convert.

Returns:

a Cloud Datastore value.

convertCollection

public <T> T convertCollection(Object collection,
 Class<?> target)

getDatastoreCompatibleType

public Optional<Class<?>> getDatastoreCompatibleType(Class inputType)

Description copied from interface: ReadWriteConversions

Get the Cloud Datastore-compatible native Java type that can be used to store the given type.

Specified by:

getDatastoreCompatibleType in interface ReadWriteConversions

Parameters:

inputType - the given type to test.

Returns:

the Cloud Datastore-compatible native Java type, if it exists.

registerEntityConverter

public void registerEntityConverter(DatastoreEntityConverter datastoreEntityConverter)

Description copied from interface: ReadWriteConversions

Registers DatastoreEntityConverter to be used for embedded entities.

Specified by:

registerEntityConverter in interface ReadWriteConversions

Parameters:

datastoreEntityConverter - the DatastoreEntityConverter.