[Hibernate求助]如何构造自己的映射类型？

/**
* 从java对象Boolean到sql中的TINYINT的映射
*/
public class BooleanMappingType implements UserType
{
   private static final int [] TYPE = {Types.TINYINT}; 
   
   public int[] sqlTypes()
   {
       return TYPE;
   }
   
   public Class returnedClass()
   {
       return Boolean.class;
   }
   
   public boolean equals(Object x, Object y) throws net.sf.hibernate.HibernateException
   {
       if( x.equals(y) ) return true;
       if( x == y)  return true;        
       return false;        
   }
   
   public Object nullSafeGet(ResultSet rs, String[] names, Object owner) throws net.sf.hibernate.HibernateException, java.sql.SQLException
   {
       Byte b = (Byte)Hibernate.BYTE.nullSafeGet(rs, names[0]);
       if( b == null)
           return Boolean.FALSE;
       if(b.intValue() != 0)
           return Boolean.TRUE;
       return Boolean.FALSE;
   }
   
   public void nullSafeSet(PreparedStatement psmt, Object value, int index) throws net.sf.hibernate.HibernateException, java.sql.SQLException
   {
       Boolean b = (value == null) ? Boolean.FALSE : (Boolean)value;
       Hibernate.BYTE.nullSafeSet(psmt, b, index);
   }
   
   public Object deepCopy(Object x) throws net.sf.hibernate.HibernateException
   {
       if(x.equals(Boolean.TRUE))
           return new Boolean(true);
       if(x.equals(Boolean.FALSE))
           return new Boolean(false);
       return null;
   }
   
   public boolean isMutable()
   {
       return true;
   }
}
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