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 ) );
	}
}