hyperstream/tools/apply/2017-11-27_v0.0.3.py
# The MIT License (MIT) # Copyright (c) 2014-2017 University of Bristol
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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from hyperstream.stream import StreamInstance
from hyperstream.tool import Tool, check_input_stream_count
class Apply(Tool):
"""
Simple tool that applies a function to every data item
"""
def __init__(self, func, include_timestamps=False):
super(Apply, self).__init__(func=func, include_timestamps=include_timestamps)
@check_input_stream_count(1)
def _execute(self, sources, alignment_stream, interval):
for t, d in sources[0].window(interval, force_calculation=True):
if self.include_timestamps:
yield StreamInstance(t, self.func(t, d))
else:
yield StreamInstance(t, self.func(d))