hyperstream/tools/index_of/2016-10-26_v0.1.0.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
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# 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.tool import SelectorTool
from hyperstream.stream import StreamMetaInstance
class IndexOf(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, selector_meta_data):
super(IndexOf, self).__init__(index=index, selector_meta_data=selector_meta_data)
self.index = index
def _execute(self, sources, interval):
found_source = False
found_data_in_source = False
for source in sources:
if (self.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