IRC-SPHERE/HyperStream

# The MIT License (MIT) # Copyright (c) 2014-2017 University of Bristol
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from hyperstream.stream import StreamInstance
from hyperstream.tool import Tool, check_input_stream_count


class DictValuesToConst(Tool):
    """
    Tool that replaces all the values in a dict by a particular constant.
    For example, could be used to count occurrences of each dict key in the stream, if using constant 1 and then later
    adding the counts with the tool list_dict_sum
    """
    def __init__(self,const=1):
        super(DictValuesToConst, self).__init__(const=const)

    @check_input_stream_count(1)
    def _execute(self, sources, alignment_stream, interval):
        for time, data in sources[0].window(interval, force_calculation=True):
            res = dict()
            for key in data.keys():
                res[key] = self.const
            yield StreamInstance(time, res)