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A module of the Hibernate Core project
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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. 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 Inc.
 *
 * 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.type;

import java.lang.reflect.Method;

import org.hibernate.EntityMode;
import org.hibernate.FetchMode;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.CascadeStyle;
import org.hibernate.engine.spi.SessionImplementor;

/**
 * Contract for value types to hold collections and have cascades, etc.  The notion is that of composition.  JPA terms
 * this an embeddable.
 *
 * @author Steve Ebersole
 */
public interface CompositeType extends Type {
	/**
	 * Get the types of the component properties
	 *
	 * @return The component property types.
	 */
	public Type[] getSubtypes();

	/**
	 * Get the names of the component properties
	 *
	 * @return The component property names
	 */
	public String[] getPropertyNames();

	/**
	 * Retrieve the indicators regarding which component properties are nullable.
	 * 
	 * An optional operation
	 *
	 * @return nullability of component properties
	 */
	public boolean[] getPropertyNullability();

	/**
	 * Extract the values of the component properties from the given component instance
	 *
	 * @param component The component instance
	 * @param session The session from which the request originates
	 *
	 * @return The property values
	 *
	 * @throws HibernateException Indicates a problem access the property values.
	 */
	public Object[] getPropertyValues(Object component, SessionImplementor session) throws HibernateException;

	/**
	 * Extract the values of the component properties from the given component instance without access to the
	 * session.
	 * 

	 * An optional operation
	 *
	 * @param component The component instance
	 * @param entityMode The entity mode
	 *
	 * @return The property values
	 *
	 * @throws HibernateException Indicates a problem access the property values.
	 */
	public Object[] getPropertyValues(Object component, EntityMode entityMode) throws HibernateException;

	/**
	 * Extract a particular component property value indicated by index.
	 *
	 * @param component The component instance
	 * @param index The index of the property whose value is to be extracted
	 * @param session The session from which the request originates.
	 *
	 * @return The extracted component property value
	 *
	 * @throws HibernateException Indicates a problem access the property value.
	 */
	public Object getPropertyValue(Object component, int index, SessionImplementor session) throws HibernateException;

	/**
	 * Inject property values onto the given component instance
	 * 
	 * An optional operation
	 *
	 * @param component The component instance
	 * @param values The values to inject
	 * @param entityMode The entity mode
	 *
	 * @throws HibernateException Indicates an issue performing the injection
	 */
	public void setPropertyValues(Object component, Object[] values, EntityMode entityMode) throws HibernateException;

	/**
	 * Retrieve the cascade style of the indicated component property.
	 *
	 * @param index The property index,
	 *
	 * @return The cascade style.
	 */
	public CascadeStyle getCascadeStyle(int index);

	/**
	 * Retrieve the fetch mode of the indicated component property.
	 *
	 * @param index The property index,
	 *
	 * @return The fetch mode
	 */
	public FetchMode getFetchMode(int index);

	/**
	 * Is the given method a member of this component's class?
	 *
	 * @param method The method to check
	 *
	 * @return True if the method is a member; false otherwise.
	 */
	public boolean isMethodOf(Method method);

	/**
	 * Is this component embedded?  "embedded" indicates that the component is "virtual", that its properties are
	 * "flattened" onto its owner
	 *
	 * @return True if this component is embedded; false otherwise.
	 */
	public boolean isEmbedded();
}