#!/usr/bin/env python
#
# $Id: wrap.py,v 1.1 2001/07/12 05:47:15 tlau Exp $
#
import log
import types

class Wrapper:
	attr_dict = {}
	free_ptr = 0
	new_func = None
	del_func = None
	ptr = None
	def __init__(self, ptr = None, new_func = None, del_func = None, attr_dict = None):
		if attr_dict is not None:
			self.__dict__['attr_dict'] = attr_dict
		else:
			self.__dict__['attr_dict'] = {}
                self.free_ptr = 0
                if ptr is None and new_func is not None:
			ptr = new_func()
                        if ptr is None:
				raise MemoryError, "Unable to allocate memory."
                        self.free_ptr = 1
		self.new_func = new_func
		self.del_func = del_func
                self.ptr = ptr


	def __del__(self):
		if self.free_ptr and self.del_func is not None:
			self.del_func(self.ptr)


	def __str__(self):
		return '<%s at 0x%x>' % (self.__class__, id(self))


	def __getattr__(self, name):
		if self.__dict__['attr_dict'].has_key(name):
			attr_data = self.attr_dict[name]
			value = attr_data[0](self.ptr)
			if attr_data[2] is not None:
				value = attr_data[2](value)
			self.__dict__[name] = value
			return value
		raise AttributeError, "%s instance has no attribute '%s'" % (self.__class__, name)


	def __setattr__(self, name, value):
		if self.__dict__.has_key(name):
			self.__dict__[name] = value
		if self.__dict__['attr_dict'].has_key(name):
			attr_data = self.attr_dict[name]
			if type(value) == types.InstanceType:
				attr_data[1](self.ptr, value.ptr)
			else:
				attr_data[1](self.ptr, value)
		self.__dict__[name] = value