Hibernate example source code file (InheritanceType.java)

This example Hibernate source code file (InheritanceType.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

inheritancetype, inheritancetype, joinedsubclass, mappingexception, none, persistentclass, single, singletablesubclass, subclass, subclass, table_per_class, unionsubclass, unionsubclass, unknown

The Hibernate InheritanceType.java source code

/*
 * 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.envers.configuration.metadata;
import org.hibernate.MappingException;
import org.hibernate.mapping.JoinedSubclass;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.mapping.SingleTableSubclass;
import org.hibernate.mapping.Subclass;
import org.hibernate.mapping.UnionSubclass;

/**
 * @author Adam Warski (adam at warski dot org)
 */
public enum InheritanceType {
    NONE,
    JOINED,
    SINGLE,
    TABLE_PER_CLASS;

    /**
     * @param pc The class for which to get the inheritance type.
     * @return The inheritance type of this class. NONE, if this class does not inherit from
     * another persisten class.
     */
    public static InheritanceType get(PersistentClass pc) {
        PersistentClass superclass = pc.getSuperclass();
        if (superclass == null) {
            return InheritanceType.NONE;
        }

        // We assume that every subclass is of the same type.
        Subclass subclass = (Subclass) superclass.getSubclassIterator().next();

        if (subclass instanceof SingleTableSubclass) {
            return InheritanceType.SINGLE;
        } else if (subclass instanceof JoinedSubclass) {
            return InheritanceType.JOINED;
        } else if (subclass instanceof UnionSubclass) {
            return InheritanceType.TABLE_PER_CLASS;
        }

        throw new MappingException("Unknown subclass class: " + subclass.getClass());
    }
}