org.hibernate.tuple.entity.EntityTuplizer Maven / Gradle / Ivy

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.tuple.entity;

import java.io.Serializable;
import java.util.Map;

import org.hibernate.EntityMode;
import org.hibernate.EntityNameResolver;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.property.access.spi.Getter;
import org.hibernate.proxy.ProxyFactory;
import org.hibernate.tuple.Tuplizer;

/**
 * Defines further responsibilities regarding tuplization based on
 * a mapped entity.
 * 
 * EntityTuplizer implementations should have the following constructor signatures:
 *      (org.hibernate.tuple.entity.EntityMetamodel, org.hibernate.mapping.PersistentClass)
 *      (org.hibernate.tuple.entity.EntityMetamodel, org.hibernate.metamodel.binding.EntityBinding)
 *
 * @author Gavin King
 * @author Steve Ebersole
 */
public interface EntityTuplizer extends Tuplizer {
	/**
	 * Return the entity-mode handled by this tuplizer instance.
	 *
	 * @return The entity-mode
	 */
	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
	 *
	 * @deprecated Use {@link #instantiate(Serializable, SharedSessionContractImplementor)} instead.
     */
	@Deprecated
	@SuppressWarnings( {"JavaDoc"})
	Object instantiate(Serializable id) throws HibernateException;

    /**
     * Create an entity instance initialized with the given identifier.
     *
     * @param id The identifier value for the entity to be instantiated.
	 * @param session The session from which is requests originates
	 *
     * @return The instantiated entity.
     */
	Object instantiate(Serializable id, SharedSessionContractImplementor session);

    /**
     * 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 occurs accessing its value.
	 *
	 * @deprecated Use {@link #getIdentifier(Object,SharedSessionContractImplementor)} instead.
     */
	@Deprecated
	Serializable getIdentifier(Object entity) throws HibernateException;

    /**
     * Extract the identifier value from the given entity.
     *
     * @param entity The entity from which to extract the identifier value.
	 * @param session The session from which is requests originates
	 *
     * @return The identifier value.
     */
	Serializable getIdentifier(Object entity, SharedSessionContractImplementor session);

    /**
     * Inject the identifier value into the given entity.
     * 
     * 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.
	 *
	 * @deprecated Use {@link #setIdentifier(Object, Serializable, SharedSessionContractImplementor)} instead.
     */
	@Deprecated
	@SuppressWarnings( {"JavaDoc"})
	void setIdentifier(Object entity, Serializable id) throws HibernateException;

    /**
     * Inject the identifier value into the given entity.
     * 
     * 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.
	 * @param session The session from which is requests originates
     */
	void setIdentifier(Object entity, Serializable id, SharedSessionContractImplementor session);

	/**
	 * Inject the given identifier and version into the entity, in order to
	 * "roll back" to their original values.
	 *
	 * @param entity The entity for which to reset the id/version values
	 * @param currentId The identifier value to inject into the entity.
	 * @param currentVersion The version value to inject into the entity.
	 *
	 * @deprecated Use {@link #resetIdentifier(Object, Serializable, Object, SharedSessionContractImplementor)} instead
	 */
	@Deprecated
	@SuppressWarnings( {"UnusedDeclaration"})
	void resetIdentifier(Object entity, Serializable currentId, Object currentVersion);

	/**
	 * Inject the given identifier and version into the entity, in order to
	 * "roll back" to their original values.
	 *
	 * @param entity The entity for which to reset the id/version values
	 * @param currentId The identifier value to inject into the entity.
	 * @param currentVersion The version value to inject into the entity.
	 * @param session The session from which the request originated
	 */
	void resetIdentifier(Object entity, Serializable currentId, Object currentVersion, SharedSessionContractImplementor session);

    /**
     * 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 Indicates a problem accessing the version property
     */
	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 Indicates a problem access the property
	 */
	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 Indicates a problem access the property
	 */
	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 result set is being made.
	 * @return The insertable property values.
	 * @throws HibernateException Indicates a problem access the properties
	 */
	Object[] getPropertyValuesToInsert(Object entity, Map mergeMap, SharedSessionContractImplementor 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 Indicates a problem access the property
	 */
	Object getPropertyValue(Object entity, String propertyName) throws HibernateException;

    /**
     * Called just after the entities properties have been initialized.
     *
     * @param entity The entity being initialized.
     * @param session The session initializing this entity.
     */
	void afterInitialize(Object entity, SharedSessionContractImplementor session);

	/**
	 * Does this entity, for this mode, present a possibility for proxying?
	 *
	 * @return True if this tuplizer can generate proxies for this entity.
	 */
	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.
	 */
	Object createProxy(Serializable id, SharedSessionContractImplementor 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.
	 */
	boolean isLifecycleImplementor();

	/**
	 * Returns the java class to which generated proxies will be typed.
	 * 
	 * todo : look at fully encapsulating {@link org.hibernate.engine.spi.PersistenceContext#narrowProxy} here,
	 * since that is the only external use of this method
	 *
	 * @return The java class to which generated proxies will be typed
	 */
	Class getConcreteProxyClass();

	/**
	 * Get any {@link EntityNameResolver EntityNameResolvers} associated with this {@link Tuplizer}.
	 *
	 * @return The associated resolvers.  May be null or empty.
	 */
	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 inheritance
	 * hierarchy.
	 * 

	 * For example, consider a case where a user calls session.update( "Animal", cat );.  Here, the
	 * user has explicitly provided Animal as the entity-name.  However, they have passed in an instance
	 * of Cat which is a subclass of Animal.  In this case, we would return Cat as the
	 * entity-name.
	 * 
	 * null may be returned from calls to this method.  The meaning of null in that case is assumed
	 * to be that we should use whatever explicit entity-name the user provided (Animal rather than Cat
	 * 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 inheritance hierarchy.
	 */
	String determineConcreteSubclassEntityName(Object entityInstance, SessionFactoryImplementor factory);

	/**
	 * Retrieve the getter for the identifier property.  May return null.
	 *
	 * @return The getter for the identifier property.
	 */
	Getter getIdentifierGetter();

	/**
	 * Retrieve the getter for the version property.  May return null.
	 *
	 * @return The getter for the version property.
	 */
	Getter getVersionGetter();

	default ProxyFactory getProxyFactory() {
		return null;
	}
}