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The core O/RM functionality as provided by Hibernate
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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.engine.spi;

import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.hibernate.LockMode;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.persister.entity.EntityPersister;

/**
 * We need an entry to tell us all about the current state of an object with respect to its persistent state
 *
 * Implementation Warning: Hibernate needs to instantiate a high amount of instances of this class,
 * therefore we need to take care of its impact on memory consumption.
 *
 * @author Gavin King
 * @author Emmanuel Bernard 
 * @author Gunnar Morling
 * @author Sanne Grinovero  
 */
public interface EntityEntry {
	LockMode getLockMode();

	void setLockMode(LockMode lockMode);

	Status getStatus();

	void setStatus(Status status);

	Serializable getId();

	Object[] getLoadedState();

	Object getLoadedValue(String propertyName);

	void overwriteLoadedStateCollectionValue(String propertyName, PersistentCollection collection);

	Object[] getDeletedState();

	void setDeletedState(Object[] deletedState);

	boolean isExistsInDatabase();

	Object getVersion();

	EntityPersister getPersister();

	/**
	 * Get the EntityKey based on this EntityEntry.
	 * @return the EntityKey
	 * @throws  IllegalStateException if getId() is null
	 */
	EntityKey getEntityKey();

	String getEntityName();

	boolean isBeingReplicated();

	Object getRowId();

	/**
	 * Handle updating the internal state of the entry afterQuery actually performing
	 * the database update.  Specifically we update the snapshot information and
	 * escalate the lock mode
	 *
	 * @param entity The entity instance
	 * @param updatedState The state calculated afterQuery the update (becomes the
	 * new {@link #getLoadedState() loaded state}.
	 * @param nextVersion The new version.
	 */
	void postUpdate(Object entity, Object[] updatedState, Object nextVersion);

	/**
	 * After actually deleting a row, record the fact that the instance no longer
	 * exists in the database
	 */
	void postDelete();

	/**
	 * After actually inserting a row, record the fact that the instance exists on the
	 * database (needed for identity-column key generation)
	 */
	void postInsert(Object[] insertedState);

	boolean isNullifiable(boolean earlyInsert, SharedSessionContractImplementor session);

	/**
	 * Not sure this is the best method name, but the general idea here is to return {@code true} if the entity can
	 * possibly be dirty.  This can only be the case if it is in a modifiable state (not read-only/deleted) and it
	 * either has mutable properties or field-interception is not telling us it is dirty.  Clear as mud? :/
	 *
	 * A name like canPossiblyBeDirty might be better
	 *
	 * @param entity The entity to test
	 *
	 * @return {@code true} indicates that the entity could possibly be dirty and that dirty check
	 * should happen; {@code false} indicates there is no way the entity can be dirty
	 */
	boolean requiresDirtyCheck(Object entity);

	/**
	 * Can the entity be modified?
	 *
	 * The entity is modifiable if all of the following are true:
	 * 
	 * the entity class is mutable
	 * the entity is not read-only
	 * if the current status is Status.DELETED, then the entity was not read-only when it was deleted
	 * 
	 * @return true, if the entity is modifiable; false, otherwise,
	 */
	boolean isModifiableEntity();

	void forceLocked(Object entity, Object nextVersion);

	boolean isReadOnly();

	void setReadOnly(boolean readOnly, Object entity);

	@Override
	String toString();

	/**
	 * Custom serialization routine used during serialization of a
	 * Session/PersistenceContext for increased performance.
	 *
	 * @param oos The stream to which we should write the serial data.
	 *
	 * @throws java.io.IOException If a stream error occurs
	 */
	void serialize(ObjectOutputStream oos) throws IOException;

	//the following methods are handling extraState contracts.
	//they are not shared by a common superclass to avoid alignment padding
	//we are trading off duplication for padding efficiency
	void addExtraState(EntityEntryExtraState extraState);

	 T getExtraState(Class extraStateType);
}