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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) 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.mapping;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * Represents a @MappedSuperclass.
 * A @MappedSuperclass can be a superclass of an @Entity (root or not)
 *
 * This class primary goal is to give a representation to @MappedSuperclass
 * in the metamodel in order to reflect them in the JPA 2 metamodel.
 *
 * Do not use outside this use case.
 *
 * 
 * A proper redesign will be evaluated in Hibernate 4
 *
 * Implementation details:
 * properties are copies of their closest sub-persistentClass versions
 *
 * @author Emmanuel Bernard
 */
public class MappedSuperclass {
	private final MappedSuperclass superMappedSuperclass;
	private final PersistentClass superPersistentClass;
	private final List declaredProperties;
	private Class mappedClass;
	private Property identifierProperty;
	private Property version;
	private Component identifierMapper;

	public MappedSuperclass(MappedSuperclass superMappedSuperclass, PersistentClass superPersistentClass) {
		this.superMappedSuperclass = superMappedSuperclass;
		this.superPersistentClass = superPersistentClass;
		this.declaredProperties = new ArrayList();
	}

	/**
	 * Returns the first superclass marked as @MappedSuperclass or null if:
	 *  - none exists
	 *  - or the first persistent superclass found is an @Entity
	 *
	 * @return the super MappedSuperclass
	 */
	public MappedSuperclass getSuperMappedSuperclass() {
		return superMappedSuperclass;
	}

	public boolean hasIdentifierProperty() {
		return getIdentifierProperty() != null;
	}

	public boolean isVersioned() {
		return getVersion() != null;
	}

	/**
	 * Returns the PersistentClass of the first superclass marked as @Entity
	 * or null if none exists
	 *
	 * @return the PersistentClass of the superclass
	 */
	public PersistentClass getSuperPersistentClass() {
		return superPersistentClass;
	}

	public Iterator getDeclaredPropertyIterator() {
		return declaredProperties.iterator();
	}

	public void addDeclaredProperty(Property p) {
		//Do not add duplicate properties
		//TODO is it efficient enough?
		String name = p.getName();
		Iterator it = declaredProperties.iterator();
		while (it.hasNext()) {
			if ( name.equals( ((Property)it.next()).getName() ) ) {
				return;
			}
		}
		declaredProperties.add(p);
	}

	public Class getMappedClass() {
		return mappedClass;
	}

	public void setMappedClass(Class mappedClass) {
		this.mappedClass = mappedClass;
	}

	public Property getIdentifierProperty() {
		//get direct identifiermapper or the one from the super mappedSuperclass
		// or the one from the super persistentClass
		Property propagatedIdentifierProp = identifierProperty;
		if ( propagatedIdentifierProp == null ) {
			if ( superMappedSuperclass != null ) {
				propagatedIdentifierProp = superMappedSuperclass.getIdentifierProperty();
			}
			if (propagatedIdentifierProp == null && superPersistentClass != null){
				propagatedIdentifierProp = superPersistentClass.getIdentifierProperty();
			}
		}
		return propagatedIdentifierProp;
	}

	public Property getDeclaredIdentifierProperty() {
		return identifierProperty;
	}

	public void setDeclaredIdentifierProperty(Property prop) {
		this.identifierProperty = prop;
	}

	public Property getVersion() {
		//get direct version or the one from the super mappedSuperclass
		// or the one from the super persistentClass
		Property propagatedVersion = version;
		if (propagatedVersion == null) {
			if ( superMappedSuperclass != null ) {
				propagatedVersion = superMappedSuperclass.getVersion();
			}
			if (propagatedVersion == null && superPersistentClass != null){
				propagatedVersion = superPersistentClass.getVersion();
			}
		}
		return propagatedVersion;
	}

	public Property getDeclaredVersion() {
		return version;
	}

	public void setDeclaredVersion(Property prop) {
		this.version = prop;
	}

	public Component getIdentifierMapper() {
		//get direct identifiermapper or the one from the super mappedSuperclass
		// or the one from the super persistentClass
		Component propagatedMapper = identifierMapper;
		if ( propagatedMapper == null ) {
			if ( superMappedSuperclass != null ) {
				propagatedMapper = superMappedSuperclass.getIdentifierMapper();
			}
			if (propagatedMapper == null && superPersistentClass != null){
				propagatedMapper = superPersistentClass.getIdentifierMapper();
			}
		}
		return propagatedMapper;
	}

	public Component getDeclaredIdentifierMapper() {
		return identifierMapper;
	}

	public void setDeclaredIdentifierMapper(Component identifierMapper) {
		this.identifierMapper = identifierMapper;
	}
}