# Tai Sakuma <tai.sakuma@gmail.com>
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[docs]class NextKeyComposer:
[docs] def __init__(self, binnings):
self._binnings = binnings
def __repr__(self):
return '{}(binnings = {!r})'.format(
self.__class__.__name__,
self._binnings
)
def __call__(self, key):
"""returns a list of the next keys
e.g.,
If key = (11, 8, 20)
it returns ((12, 8, 20), (11, 9, 20), (11, 8, 21))
When the next bin is None, it won't be included.
When the next bin is the same, it won't be included.
"""
ret = [ ]
for i in range(len(self._binnings)):
keyc = list(key)
thisbin = keyc[i]
nextbin = self._binnings[i].next(thisbin)
if nextbin is None: continue
if nextbin == thisbin: continue
keyc[i] = nextbin
ret.append(tuple(keyc))
return tuple(ret)
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