classtype.java

用Java实现的23个常用设计模式源代码

//$Id: ClassType.java,v 1.4.2.5 2003/11/21 16:06:40 oneovthafew Exp $
package net.sf.hibernate.type;

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

import net.sf.hibernate.Hibernate;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.util.EqualsHelper;
import net.sf.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 boolean equals(Object x, Object y) throws HibernateException {
		return EqualsHelper.equals(x, y);
	}
	
	public String getName() {
		return "class";
	}
	
	public Object fromString(String xml) throws HibernateException {
		try {
			return ReflectHelper.classForName(xml);
		}
		catch (ClassNotFoundException cnfe) {
			throw new HibernateException("could not parse xml", cnfe);
		}
	}
	
}