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The core O/RM functionality as provided by Hibernate
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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.loader.entity;
import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.MappingException;
import org.hibernate.engine.spi.LoadQueryInfluencers;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.persister.entity.OuterJoinLoadable;
import org.hibernate.type.Type;

/**
 * Loads an entity instance using outerjoin fetching to fetch associated entities.
 * 

 * The EntityPersister must implement Loadable. For other entities,
 * create a customized subclass of Loader.
 *
 * @author Gavin King
 */
public class EntityLoader extends AbstractEntityLoader {

	private final boolean batchLoader;
	private final int[][] compositeKeyManyToOneTargetIndices;

	public EntityLoader(
			OuterJoinLoadable persister,
			LockMode lockMode,
			SessionFactoryImplementor factory,
			LoadQueryInfluencers loadQueryInfluencers) throws MappingException {
		this( persister, 1, lockMode, factory, loadQueryInfluencers );
	}

	public EntityLoader(
			OuterJoinLoadable persister,
			LockOptions lockOptions,
			SessionFactoryImplementor factory,
			LoadQueryInfluencers loadQueryInfluencers) throws MappingException {
		this( persister, 1, lockOptions, factory, loadQueryInfluencers );
	}

	public EntityLoader(
			OuterJoinLoadable persister,
			int batchSize,
			LockMode lockMode,
			SessionFactoryImplementor factory,
			LoadQueryInfluencers loadQueryInfluencers) throws MappingException {
		this(
				persister,
				persister.getIdentifierColumnNames(),
				persister.getIdentifierType(),
				batchSize,
				lockMode,
				factory,
				loadQueryInfluencers
			);
	}

	public EntityLoader(
			OuterJoinLoadable persister,
			int batchSize,
			LockOptions lockOptions,
			SessionFactoryImplementor factory,
			LoadQueryInfluencers loadQueryInfluencers) throws MappingException {
		this(
				persister,
				persister.getIdentifierColumnNames(),
				persister.getIdentifierType(),
				batchSize,
				lockOptions,
				factory,
				loadQueryInfluencers
			);
	}

	public EntityLoader(
			OuterJoinLoadable persister,
			String[] uniqueKey,
			Type uniqueKeyType,
			int batchSize,
			LockMode lockMode,
			SessionFactoryImplementor factory,
			LoadQueryInfluencers loadQueryInfluencers) throws MappingException {
		super( persister, uniqueKeyType, factory, loadQueryInfluencers );

		EntityJoinWalker walker = new EntityJoinWalker(
				persister,
				uniqueKey,
				batchSize,
				lockMode,
				factory,
				loadQueryInfluencers
		);
		initFromWalker( walker );
		this.compositeKeyManyToOneTargetIndices = walker.getCompositeKeyManyToOneTargetIndices();
		postInstantiate();

		batchLoader = batchSize > 1;

		if ( LOG.isDebugEnabled() ) {
			LOG.debugf( "Static select for entity %s [%s]: %s", entityName, lockMode, getSQLString() );
		}
	}

	public EntityLoader(
			OuterJoinLoadable persister,
			String[] uniqueKey,
			Type uniqueKeyType,
			int batchSize,
			LockOptions lockOptions,
			SessionFactoryImplementor factory,
			LoadQueryInfluencers loadQueryInfluencers) throws MappingException {
		super( persister, uniqueKeyType, factory, loadQueryInfluencers );

		EntityJoinWalker walker = new EntityJoinWalker(
				persister,
				uniqueKey,
				batchSize,
				lockOptions,
				factory,
				loadQueryInfluencers
		);
		initFromWalker( walker );
		this.compositeKeyManyToOneTargetIndices = walker.getCompositeKeyManyToOneTargetIndices();
		postInstantiate();

		batchLoader = batchSize > 1;

		if ( LOG.isDebugEnabled() ) {
			LOG.debugf( "Static select for entity %s [%s:%s]: %s",
					entityName,
					lockOptions.getLockMode(),
					lockOptions.getTimeOut(),
					getSQLString() );
		}
	}

	public Object loadByUniqueKey(SessionImplementor session,Object key) {
		return load( session, key, null, null, LockOptions.NONE );
	}

	@Override
    protected boolean isSingleRowLoader() {
		return !batchLoader;
	}

	@Override
    public int[][] getCompositeKeyManyToOneTargetIndices() {
		return compositeKeyManyToOneTargetIndices;
	}
}