com.googlecode.objectify.impl.translate

Class ClassPopulator<P>

java.lang.Object

com.googlecode.objectify.impl.translate.ClassPopulator<P>

All Implemented Interfaces:

Populator<P>

public class ClassPopulator<P>
extends Object
implements Populator<P>

Used by translators to populate properties between POJO and PropertiesContainer. Unlike translators, this does not create the POJO or container, it just copies translated properties between them.

Always excludes the key fields, @Id and @Parent.

Author:

Jeff Schnitzer

Constructor Summary

Constructors

Constructor and Description
ClassPopulator(Class<P> clazz, CreateContext ctx, Path path)

Method Summary

Modifier and Type	Method and Description
KeyMetadata<P>	getKeyMetadata() Gets the key metadata but only if this was an @Entity annotated class.
void	load(com.google.cloud.datastore.FullEntity<?> node, LoadContext ctx, Path path, P into) Loads the content of the specified datastore node into an existing POJO.
void	save(P pojo, boolean index, SaveContext ctx, Path path, com.google.cloud.datastore.FullEntity.Builder<?> into) Saves data from the POJO into the entity builder.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassPopulator

public ClassPopulator(Class<P> clazz,
                      CreateContext ctx,
                      Path path)

Method Detail

load

public void load(com.google.cloud.datastore.FullEntity<?> node,
                 LoadContext ctx,
                 Path path,
                 P into)

Description copied from interface: Populator

Loads the content of the specified datastore node into an existing POJO.

Specified by:

load in interface Populator<P>

Parameters:

node - is the part of the native datastore entity tree we are transforming.

ctx - holds state information during an entity load.

path - is the current path to this POJO

save

public void save(P pojo,
                 boolean index,
                 SaveContext ctx,
                 Path path,
                 com.google.cloud.datastore.FullEntity.Builder<?> into)

Description copied from interface: Populator

Saves data from the POJO into the entity builder.

Specified by:

save in interface Populator<P>

Parameters:

pojo - is an object from the pojo entity graph; possibly the whole graph or possibly just a leaf field.

index - is whether the instruction so far is to index or not index property values

path - is the path that we have taken to get here, which could be long due to re-entrant translators (ie, an embedded pojo that also has a reference to the same class).

getKeyMetadata

public KeyMetadata<P> getKeyMetadata()

Gets the key metadata but only if this was an @Entity annotated class. Should not be called if not.