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##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Batching support tests
"""
class batch(object):
"""Create a sequence batch"""
def __init__(self, sequence, size, start=0, end=0,
orphan=3, overlap=0):
start = start + 1
start, end, sz = opt(start, end, size, orphan, sequence)
self._last = end - 1
self._first = start - 1
self._sequence = sequence
self._size = size
self._start = start
self._end = end
self._orphan = orphan
self._overlap = overlap
def previous_sequence(self):
return self._first
def next_sequence_end_item(self):
_start, end, _spam = opt(self._end+1-self._overlap, 0,
self._size, self._orphan, self._sequence)
return self._sequence[end-1]
def next_sequence_start_item(self):
start, _end, _spam = opt(self._end+1-self._overlap, 0,
self._size, self._orphan, self._sequence)
return self._sequence[start-1]
def next_sequence(self):
return self._end < len(self._sequence)
# try: self._sequence[self._end]
# except IndexError: return 0
# else: return 1
def __getitem__(self, index):
if index > self._last:
raise IndexError(index)
return self._sequence[index + self._first]
def opt(start, end, size, orphan, sequence):
assert size >= 1
assert start > 0
start = len(sequence) if start - 1 >= len(sequence) else start
assert end <= 0
end = start + size - 1
assert end + orphan - 1 < len(sequence)
return start, end, size
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