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Hibernate's core ORM functionality

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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 http://www.gnu.org/licenses/lgpl-2.1.html
 */
package org.hibernate.metamodel.model.domain.internal;

import java.io.Serializable;
import javax.persistence.metamodel.EntityType;

import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.graph.internal.SubGraphImpl;
import org.hibernate.graph.spi.SubGraphImplementor;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.metamodel.model.domain.spi.EntityTypeDescriptor;
import org.hibernate.metamodel.model.domain.spi.IdentifiableTypeDescriptor;

/**
 * Defines the Hibernate implementation of the JPA {@link EntityType} contract.
 *
 * @author Steve Ebersole
 * @author Emmanuel Bernard
 */
public class EntityTypeImpl
		extends AbstractIdentifiableType
		implements EntityTypeDescriptor, Serializable {
	private final String jpaEntityName;

	@SuppressWarnings("unchecked")
	public EntityTypeImpl(
			Class javaType,
			IdentifiableTypeDescriptor superType,
			PersistentClass persistentClass,
			SessionFactoryImplementor sessionFactory) {
		super(
				javaType,
				persistentClass.getEntityName(),
				superType,
				persistentClass.getDeclaredIdentifierMapper() != null || ( superType != null && superType.hasIdClass() ),
				persistentClass.hasIdentifierProperty(),
				persistentClass.isVersioned(),
				sessionFactory
		);
		this.jpaEntityName = persistentClass.getJpaEntityName();
	}

	@Override
	public String getName() {
		return jpaEntityName;
	}

	@Override
	public BindableType getBindableType() {
		return BindableType.ENTITY_TYPE;
	}

	@Override
	public Class getBindableJavaType() {
		return getJavaType();
	}

	@Override
	public PersistenceType getPersistenceType() {
		return PersistenceType.ENTITY;
	}

	@Override
	public IdentifiableTypeDescriptor getSuperType() {
		return super.getSuperType();
	}

	@Override
	@SuppressWarnings("unchecked")
	public  SubGraphImplementor makeSubGraph(Class subType) {
		if ( ! getBindableJavaType().isAssignableFrom( subType ) ) {
			throw new IllegalArgumentException(
					String.format(
							"Entity type [%s] cannot be treated as requested sub-type [%s]",
							getName(),
							subType.getName()
					)
			);
		}

		return new SubGraphImpl( this, true, sessionFactory() );
	}

	@Override
	public SubGraphImplementor makeSubGraph() {
		return makeSubGraph( getBindableJavaType() );
	}

	@Override
	public String toString() {
		return getName();
	}
}