IRC-SPHERE/HyperStream

# 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
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#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
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#  The above copyright notice and this permission notice shall be included in all
#  copies or substantial portions of the Software.
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#  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.tool import Tool, check_input_stream_count
from hyperstream.stream import StreamInstance


class AlignedCorrelation(Tool):
    @check_input_stream_count(2)
    def _execute(self, sources, alignment_stream, interval):
        s0 = sources[0].window(interval, force_calculation=True).items()
        s1 = sources[1].window(interval, force_calculation=True).items()

        if len(s0) == 0 or len(s1) == 0:
            return

        i = 0
        j = 0
        while i < len(s0) or j < len(s1):
            if s0[i].timestamp == s1[j].timestamp:
                yield StreamInstance(s0[i].timestamp, float(s0[i].value) / s1[j].value)
                i += 1
                j += 1
            elif s0[i].timestamp < s1[j].timestamp:
                i += 1
            else:
                j += 1