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.
#  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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from hyperstream.tool import SelectorTool
from hyperstream import TimeInterval, StreamMetaInstance
from hyperstream.utils import MIN_DATE


class IndexOfByStream(SelectorTool):
    """
    This tool selects a single plate value from a node (which may consist of multiple streams),
    and places the stream(s) on the appropriate plate
    """
    def __init__(self, index):
        super(IndexOfByStream, self).__init__(index=index, selector_meta_data=None)

    def _execute(self, sources, interval):
        time_interval = TimeInterval(MIN_DATE, interval.end)
        selector_meta_data = sources[0].window(time_interval, force_calculation=True).last().value

        found_source = False
        found_data_in_source = False
        for source in sources[1]:
            if (selector_meta_data, self.index) in source.stream_id.meta_data:
                found_source = True
                for item in map(lambda x: StreamMetaInstance(x, source.stream_id.meta_data),
                                source.window(interval, force_calculation=True)):
                    found_data_in_source = True
                    yield item

        if not found_source:
            raise IndexError("Index {} not found in sources".format(self.index))

        if not found_data_in_source:
            # raise ValueError("No data for index {} in sources".format(self.index))
            pass