Hibernate example source code file (OneToOne.java)

This example Hibernate source code file (OneToOne.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

arraylist, foreignkeydirection, foreignkeydirection, iterator, keyvalue, mappingexception, mappingexception, onetoone, onetoone, string, string, table, toone, type, util

The Hibernate OneToOne.java source code

/*
 * 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 org.hibernate.MappingException;
import org.hibernate.cfg.Mappings;
import org.hibernate.type.EntityType;
import org.hibernate.type.ForeignKeyDirection;
import org.hibernate.type.Type;

/**
 * A one-to-one association mapping
 * @author Gavin King
 */
public class OneToOne extends ToOne {

	private boolean constrained;
	private ForeignKeyDirection foreignKeyType;
	private KeyValue identifier;
	private String propertyName;
	private String entityName;

	public OneToOne(Mappings mappings, Table table, PersistentClass owner) throws MappingException {
		super( mappings, table );
		this.identifier = owner.getKey();
		this.entityName = owner.getEntityName();
	}

	public String getPropertyName() {
		return propertyName;
	}

	public void setPropertyName(String propertyName) {
		this.propertyName = propertyName==null ? null : propertyName.intern();
	}
	
	public String getEntityName() {
		return entityName;
	}

	public void setEntityName(String propertyName) {
		this.entityName = entityName==null ? null : entityName.intern();
	}
	
	public Type getType() throws MappingException {
		if ( getColumnIterator().hasNext() ) {
			return getMappings().getTypeResolver().getTypeFactory().specialOneToOne(
					getReferencedEntityName(), 
					foreignKeyType, 
					referencedPropertyName,
					isLazy(),
					isUnwrapProxy(),
					entityName,
					propertyName
			);
		}
		else {
			return getMappings().getTypeResolver().getTypeFactory().oneToOne(
					getReferencedEntityName(), 
					foreignKeyType, 
					referencedPropertyName,
					isLazy(),
					isUnwrapProxy(),
					isEmbedded(),
					entityName,
					propertyName
			);
		}
	}

	public void createForeignKey() throws MappingException {
		if ( constrained && referencedPropertyName==null) {
			//TODO: handle the case of a foreign key to something other than the pk
			createForeignKeyOfEntity( ( (EntityType) getType() ).getAssociatedEntityName() );
		}
	}

	public java.util.List getConstraintColumns() {
		ArrayList list = new ArrayList();
		Iterator iter = identifier.getColumnIterator();
		while ( iter.hasNext() ) list.add( iter.next() );
		return list;
	}
	/**
	 * Returns the constrained.
	 * @return boolean
	 */
	public boolean isConstrained() {
		return constrained;
	}

	/**
	 * Returns the foreignKeyType.
	 * @return AssociationType.ForeignKeyType
	 */
	public ForeignKeyDirection getForeignKeyType() {
		return foreignKeyType;
	}

	/**
	 * Returns the identifier.
	 * @return Value
	 */
	public KeyValue getIdentifier() {
		return identifier;
	}

	/**
	 * Sets the constrained.
	 * @param constrained The constrained to set
	 */
	public void setConstrained(boolean constrained) {
		this.constrained = constrained;
	}

	/**
	 * Sets the foreignKeyType.
	 * @param foreignKeyType The foreignKeyType to set
	 */
	public void setForeignKeyType(ForeignKeyDirection foreignKeyType) {
		this.foreignKeyType = foreignKeyType;
	}

	/**
	 * Sets the identifier.
	 * @param identifier The identifier to set
	 */
	public void setIdentifier(KeyValue identifier) {
		this.identifier = identifier;
	}

	public boolean isNullable() {
		return !constrained;
	}

	public Object accept(ValueVisitor visitor) {
		return visitor.accept(this);
	}
	
}