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
#  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.
#  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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from hyperstream.tool import Tool, check_input_stream_count
from hyperstream.stream import StreamInstance


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

        for (d0, d1) in zip(s0, s1):
            if d0.timestamp != d1.timestamp:
                raise ValueError("{} tool expects aligned timestamps".format(self.name))
            yield StreamInstance(d0.timestamp, d0.value * d1.value)