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# R overlay --
# -*- coding: utf-8 -*-
# Copyright (C) 2013 André Erdmann <dywi@mailerd.de>
# Distributed under the terms of the GNU General Public License;
# either version 2 of the License, or (at your option) any later version.
import itertools
import roverlay.util.objects
try:
_LONG = long
except NameError:
_LONG = int
class CounterException ( Exception ):
pass
# --- end of CounterException ---
class CounterUnderflow ( CounterException ):
pass
# --- end of CounterUnderflow ---
class AbstractCounter ( object ):
def __init__ ( self, first_value=0, use_long=False ):
super ( AbstractCounter, self ).__init__()
self._initial_value = ( _LONG if use_long else int ) ( first_value - 1 )
self._current_value = self._initial_value
# --- end of __init__ (...) ---
@roverlay.util.objects.abstractmethod
def set_value ( self, value ):
pass
# --- end of set_value (...) ---
@roverlay.util.objects.abstractmethod
def reset ( self ):
pass
# --- end of reset (...) ---
def change_value ( self, delta ):
return self.set_value ( self._current_value + delta )
# --- end of change_value (...) ---
def get_value ( self, value ):
return self._current_value
# --- end of get_value (...) ---
def get_value_unsafe ( self, value ):
return self._current_value
# --- end of get_value_unsafe (...) ---
def inc ( self, step=1 ):
return self.change_value ( step )
# --- end of inc (...) ---
def dec ( self, step=1 ):
return self.change_value ( (-1) * step )
# --- end of dec (...) ---
def __next__ ( self ):
return self.inc()
# --- end of __next__ (...) ---
def next ( self ):
# python 2
return self.__next__()
# --- end of next (...) ---
def __iter__ ( self ):
return self
# --- end of __iter__ (...) ---
# --- end of AbstractCounter ---
class UnsafeCounter ( AbstractCounter ):
def reset ( self ):
self.current_value = self._initial_value
# --- end of reset (...) ---
def set_value ( self, value ):
if value <= self._initial_value:
raise CounterUnderflow ( value )
else:
self._current_value = value
return value
# --- end of set_value (...) ---
# --- end of UnsafeCounter ---
class SkippingPriorityGenerator ( AbstractCounter ):
def __init__ ( self, first_value=0, skip=None, use_long=False ):
super ( SkippingPriorityGenerator, self ).__init__ (
first_value=first_value, use_long=use_long
)
self._nums_available = None
self._generated = None
self._reset_generated ( skip )
# --- end of __init__ (...) ---
def _calculate_nums_available ( self ):
self._nums_available = None
if self._generated:
generated = set ( self._generated )
self._nums_available = [
k for k in range ( max ( generated ), self._initial_value, -1 )
if k not in generated
]
# --- end of _calculate_nums_available (...) ---
def _reset_generated ( self, skip ):
self._nums_available = None
if skip is None:
self._generated = []
else:
self._generated = list ( skip )
self._calculate_nums_available()
# --- end of _reset_generated (...) ---
def reset ( self, skip=None ):
self.current_value = self._initial_value
self._reset_generated ( skip )
# --- end of reset (...) ---
def add_generated ( self, numbers ):
self._generated.extend ( numbers )
self._calculate_nums_available()
# --- end of add_generated (...) ---
def inc ( self ):
if self._nums_available:
value = self._nums_available.pop()
else:
value = self._current_value + 1
self._current_value = value
self._generated.append ( value )
return value
# --- end of inc (...) ---
def set_value ( self, value ):
raise NotImplementedError()
# --- end of set_value (...) ---
def change_value ( self ):
raise NotImplementedError()
# --- end of change_value (...) ---
def dec ( self ):
raise NotImplementedError()
# --- end of dec (...) ---
# --- end of SkippingPriorityGenerator ---
class IDGenerator ( UnsafeCounter ):
pass
# --- end of IDGenerator ---
|
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