Package com.googlecode.objectify.impl

Class EntityMetadata<P>

java.lang.Object

com.googlecode.objectify.impl.EntityMetadata<P>

public class EntityMetadata<P>
extends Object

Holds basic information about POJO entities, and can translate back and forth to the datastore representation.

Author:

Jeff Schnitzer

Constructor Summary

Constructors

Constructor	Description
EntityMetadata(ObjectifyFactory fact, Class<P> clazz)

Method Summary

Modifier and Type	Method	Description
Integer	getCacheExpirySeconds()	Get the expiry associated with this kind, defined by the @Cached annotation.
Class<P>	getEntityClass()	Gets the class associated with this entity.
KeyMetadata<P>	getKeyMetadata()	Get specific metadata about the key for this type.
Translator<P,com.google.appengine.api.datastore.PropertyContainer>	getTranslator()	= * @return the translator that will convert between native datastore representation and pojo for this type.
P	load(com.google.appengine.api.datastore.Entity ent, LoadContext ctx)	Converts an entity to an object of the appropriate type for this metadata structure.
com.google.appengine.api.datastore.Entity	save(P pojo, SaveContext ctx)	Converts an object to a datastore Entity with the appropriate Key type.

Methods inherited from class java.lang.Object

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

Constructor Details

EntityMetadata

public EntityMetadata(ObjectifyFactory fact,
 Class<P> clazz)

Parameters:

clazz - must have @Entity in its hierarchy

Method Details

getCacheExpirySeconds

public Integer getCacheExpirySeconds()

Get the expiry associated with this kind, defined by the @Cached annotation. For polymorphic types, this is always the instruction on the root @Entity - you cannot provide per-type caching.

Returns:

null means DO NOT CACHE, 0 means "no limit", otherwise # of seconds

load

public P load(com.google.appengine.api.datastore.Entity ent,
 LoadContext ctx)

Converts an entity to an object of the appropriate type for this metadata structure. Does not check that the entity is appropriate; that should be done when choosing which EntityMetadata to call.

save

public com.google.appengine.api.datastore.Entity save(P pojo,
 SaveContext ctx)

Converts an object to a datastore Entity with the appropriate Key type.

getEntityClass

public Class<P> getEntityClass()

Gets the class associated with this entity.

getKeyMetadata

public KeyMetadata<P> getKeyMetadata()

Get specific metadata about the key for this type.

getTranslator

public Translator<P,com.google.appengine.api.datastore.PropertyContainer> getTranslator()

= * @return the translator that will convert between native datastore representation and pojo for this type.