classtype.java

一个Java持久层类库

//$Id: ClassType.java 4582 2004-09-25 11:22:20Z oneovthafew $
package org.hibernate.type;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.util.ReflectHelper;

/**
 * <tt>class</tt>: A type that maps an SQL VARCHAR to a Java Class.
 * @author Gavin King
 */
public class ClassType extends ImmutableType {

	public Object get(ResultSet rs, String name) throws HibernateException, SQLException {
		String str = (String) Hibernate.STRING.get(rs, name);
		if (str == null) {
			return null;
		}
		else {
			try {
				return ReflectHelper.classForName(str);
			}
			catch (ClassNotFoundException cnfe) {
				throw new HibernateException("Class not found: " + str);
			}
		}
	}

	public void set(PreparedStatement st, Object value, int index) throws HibernateException, SQLException {
		//TODO: would be nice to handle proxy classes elegantly!
		Hibernate.STRING.set(st, ( (Class) value ).getName(), index);
	}

	public int sqlType() {
		return Hibernate.STRING.sqlType();
	}

	public String toString(Object value) throws HibernateException {
		return ( (Class) value ).getName();
	}

	public Class getReturnedClass() {
		return Class.class;
	}

	public String getName() {
		return "class";
	}

	public Object fromStringValue(String xml) throws HibernateException {
		try {
			return ReflectHelper.classForName(xml);
		}
		catch (ClassNotFoundException cnfe) {
			throw new HibernateException("could not parse xml", cnfe);
		}
	}

}