Hibernate example source code file (ClassificationType.java)

This example Hibernate source code file (ClassificationType.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

class, classification, classification, classificationtype, enhancedusertype, hibernateexception, hibernateexception, integer, io, jdbc, object, object, sessionimplementor, sql, sqlexception, string, string

The Hibernate ClassificationType.java source code

package org.hibernate.test.hql;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.usertype.EnhancedUserType;

/**
 * A custom type for mapping {@link org.hibernate.test.hql.Classification} instances
 * to the respective db column.
 * </p>
 * THis is largely intended to mimic JDK5 enum support in JPA.  Here we are
 * using the approach of storing the ordinal values, rather than the names.
 *
 * @author Steve Ebersole
 */
public class ClassificationType implements EnhancedUserType {

	public int[] sqlTypes() {
		return new int[] { Types.TINYINT };
	}

	public Class returnedClass() {
		return Classification.class;
	}

	public boolean equals(Object x, Object y) throws HibernateException {
		if ( x == null && y == null ) {
			return false;
		}
		else if ( x != null ) {
			return x.equals( y );
		}
		else {
			return y.equals( x );
		}
	}

	public int hashCode(Object x) throws HibernateException {
		return x.hashCode();
	}

	public Object nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner) throws HibernateException, SQLException {
		Integer ordinal = StandardBasicTypes.INTEGER.nullSafeGet( rs, names[0], session );
		return Classification.valueOf( ordinal );
	}

	public void nullSafeSet(PreparedStatement st, Object value, int index, SessionImplementor session) throws HibernateException, SQLException {
		Integer ordinal = value == null ? null : new Integer( ( ( Classification ) value ).ordinal() );
		StandardBasicTypes.INTEGER.nullSafeSet( st, ordinal, index, session );
	}

	public Object deepCopy(Object value) throws HibernateException {
		return value;
	}

	public boolean isMutable() {
		return false;
	}

	public Serializable disassemble(Object value) throws HibernateException {
		return ( Classification ) value;
	}

	public Object assemble(Serializable cached, Object owner) throws HibernateException {
		return cached;
	}

	public Object replace(Object original, Object target, Object owner) throws HibernateException {
		return original;
	}

	public String objectToSQLString(Object value) {
		return extractOrdinalString( value );
	}

	public String toXMLString(Object value) {
		return extractName( value );
	}

	public Object fromXMLString(String xmlValue) {
		return Classification.valueOf( xmlValue );
	}

	private String extractName(Object obj) {
		return ( ( Classification ) obj ).name();
	}

	private int extractOrdinal(Object value) {
		return ( ( Classification ) value ).ordinal();
	}

	private String extractOrdinalString(Object value) {
		return Integer.toString( extractOrdinal( value ) );
	}
}