//$Id: EntityTuplizer.java 7516 2005-07-16 22:20:48Z oneovthafew $
package org.hibernate.tuple.entity;
import java.io.Serializable;
import java.util.Map;
import org.hibernate.HibernateException;
import org.hibernate.EntityNameResolver;
import org.hibernate.EntityMode;
import org.hibernate.tuple.Tuplizer;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.SessionFactoryImplementor;
/**
* Defines further responsibilities reagarding tuplization based on
* a mapped entity.
* <p/>
* EntityTuplizer implementations should have the following constructor signature:
* (org.hibernate.tuple.entity.EntityMetamodel, org.hibernate.mapping.PersistentClass)
*
* @author Gavin King
* @author Steve Ebersole
*/
public interface EntityTuplizer extends Tuplizer {
/**
* Return the entity-mode handled by this tuplizer instance.
*
* @return The entity-mode
*/
public EntityMode getEntityMode();
/**
* Create an entity instance initialized with the given identifier.
*
* @param id The identifier value for the entity to be instantiated.
* @return The instantiated entity.
* @throws HibernateException
*/
public Object instantiate(Serializable id) throws HibernateException;
/**
* Extract the identifier value from the given entity.
*
* @param entity The entity from which to extract the identifier value.
* @return The identifier value.
* @throws HibernateException If the entity does not define an identifier property, or an
* error occurrs accessing its value.
*/
public Serializable getIdentifier(Object entity) throws HibernateException;
/**
* Inject the identifier value into the given entity.
* </p>
* Has no effect if the entity does not define an identifier property
*
* @param entity The entity to inject with the identifier value.
* @param id The value to be injected as the identifier.
* @throws HibernateException
*/
public void setIdentifier(Object entity, Serializable id) throws HibernateException;
/**
* Inject the given identifier and version into the entity, in order to
* "roll back" to their original values.
*
* @param currentId The identifier value to inject into the entity.
* @param currentVersion The version value to inject into the entity.
*/
public void resetIdentifier(Object entity, Serializable currentId, Object currentVersion);
/**
* Extract the value of the version property from the given entity.
*
* @param entity The entity from which to extract the version value.
* @return The value of the version property, or null if not versioned.
* @throws HibernateException
*/
public Object getVersion(Object entity) throws HibernateException;
/**
* Inject the value of a particular property.
*
* @param entity The entity into which to inject the value.
* @param i The property's index.
* @param value The property value to inject.
* @throws HibernateException
*/
public void setPropertyValue(Object entity, int i, Object value) throws HibernateException;
/**
* Inject the value of a particular property.
*
* @param entity The entity into which to inject the value.
* @param propertyName The name of the property.
* @param value The property value to inject.
* @throws HibernateException
*/
public void setPropertyValue(Object entity, String propertyName, Object value) throws HibernateException;
/**
* Extract the values of the insertable properties of the entity (including backrefs)
*
* @param entity The entity from which to extract.
* @param mergeMap a map of instances being merged to merged instances
* @param session The session in which the resuest is being made.
* @return The insertable property values.
* @throws HibernateException
*/
public Object[] getPropertyValuesToInsert(Object entity, Map mergeMap, SessionImplementor session)
throws HibernateException;
/**
* Extract the value of a particular property from the given entity.
*
* @param entity The entity from which to extract the property value.
* @param propertyName The name of the property for which to extract the value.
* @return The current value of the given property on the given entity.
* @throws HibernateException
*/
public Object getPropertyValue(Object entity, String propertyName) throws HibernateException;
/**
* Called just after the entities properties have been initialized.
*
* @param entity The entity being initialized.
* @param lazyPropertiesAreUnfetched Are defined lazy properties currently unfecthed
* @param session The session initializing this entity.
*/
public void afterInitialize(Object entity, boolean lazyPropertiesAreUnfetched, SessionImplementor session);
/**
* Does this entity, for this mode, present a possibility for proxying?
*
* @return True if this tuplizer can generate proxies for this entity.
*/
public boolean hasProxy();
/**
* Generates an appropriate proxy representation of this entity for this
* entity-mode.
*
* @param id The id of the instance for which to generate a proxy.
* @param session The session to which the proxy should be bound.
* @return The generate proxies.
* @throws HibernateException Indicates an error generating the proxy.
*/
public Object createProxy(Serializable id, SessionImplementor session) throws HibernateException;
/**
* Does the {@link #getMappedClass() class} managed by this tuplizer implement
* the {@link org.hibernate.classic.Lifecycle} interface.
*
* @return True if the Lifecycle interface is implemented; false otherwise.
*/
public boolean isLifecycleImplementor();
/**
* Does the {@link #getMappedClass() class} managed by this tuplizer implement
* the {@link org.hibernate.classic.Validatable} interface.
*
* @return True if the Validatable interface is implemented; false otherwise.
*/
public boolean isValidatableImplementor();
/**
* Returns the java class to which generated proxies will be typed.
* <p/>
* todo : look at fully encapsulating {@link org.hibernate.engine.PersistenceContext#narrowProxy} here,
* since that is the only external use of this method
*
* @return The java class to which generated proxies will be typed
*/
public Class getConcreteProxyClass();
/**
* Does the given entity instance have any currently uninitialized lazy properties?
*
* @param entity The entity to be check for uninitialized lazy properties.
* @return True if uninitialized lazy properties were found; false otherwise.
*/
public boolean hasUninitializedLazyProperties(Object entity);
/**
* Is it an instrumented POJO?
*/
public boolean isInstrumented();
/**
* Get any {@link EntityNameResolver EntityNameResolvers} associated with this {@link Tuplizer}.
*
* @return The associated resolvers. May be null or empty.
*/
public EntityNameResolver[] getEntityNameResolvers();
/**
* Given an entity instance, determine the most appropriate (most targeted) entity-name which represents it.
* This is called in situations where we already know an entity name for the given entityInstance; we are being
* asked to determine if there is a more appropriate entity-name to use, specifically within an inheritence
* hierarchy.
* <p/>
* For example, consider a case where a user calls <tt>session.update( "Animal", cat );</tt>. Here, the
* user has explicitly provided <tt>Animal</tt> as the entity-name. However, they have passed in an instance
* of <tt>Cat</tt> which is a subclass of <tt>Animal</tt>. In this case, we would return <tt>Cat</tt> as the
* entity-name.
* <p/>
* <tt>null</tt> may be returned from calls to this method. The meaining of <tt>null</tt> in that case is assumed
* to be that we should use whatever explicit entity-name the user provided (<tt>Animal</tt> rather than <tt>Cat</tt>
* in the example above).
*
* @param entityInstance The entity instance.
* @param factory Reference to the SessionFactory.
*
* @return The most appropriate entity name to use.
*
* @throws HibernateException If we are unable to determine an entity-name within the inheritence hierarchy.
*/
public String determineConcreteSubclassEntityName(Object entityInstance, SessionFactoryImplementor factory);
}
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