def testConvertToDataTableJSon(self):
data, _ = utils.InitDataTableInputsWithTimeAxis(freq=1,
chunk_duration_sec=4,
chunk_start=4,
max_samples=10)
json_data = json.loads(utils.ConvertToDataTableJSon(data, ['seconds']))
self.assertEqual([{
'id': 'seconds',
'label': 'seconds',
'type': 'number'
}], json_data['cols'])
self.assertEqual([{
'c': [{
'v': 4
}]
}, {
'c': [{
'v': 5
}]
}, {
'c': [{
'v': 6
}]
}, {
'c': [{
'v': 7
}]
}], json_data['rows'])
def _CreateChunkDataTableJSon(data_source, request, max_samples):
"""Creates a DataTable in JSON format which contains the data specified.
Data can be specified by a list of minuends and subtrahends of montage
standards and/or a list of channel keys.
Args:
data_source: The DataSource for the waveform data.
request: A DataRequest proto instance.
max_samples: The maximum number of samples in one channel response.
Returns:
JSON format DataTable loaded with montage data.
Raises:
ValueError: The requested channels have multiple frequency types.
"""
channel_indices = _GetChannelIndicesInChannelDataIdList(
request.channel_data_ids)
req_channel_freqs = list(
set(
data_source.GetChannelSamplingFrequency(index)
for index in channel_indices))
if len(req_channel_freqs) != 1:
ValueError('The requested channels do not have the same frequency')
sample_freq = req_channel_freqs[0]
# Initialize Dygraph data with a time axis of sampling frequency.
output_data, _ = utils.InitDataTableInputsWithTimeAxis(
sample_freq, request.chunk_duration_secs, request.chunk_start,
max_samples)
columns_order = ['seconds']
channel_data, channel_names = _CreateChannelData(data_source, request,
max_samples)
output_data = _AddDataTableSeries(channel_data, output_data)
columns_order.extend(channel_names)
return (utils.ConvertToDataTableJSon(output_data,
columns_order), sample_freq)
def _CreateChunkDataTableJSon(data_source, request, max_samples):
"""Creates a DataTable in JSON format which contains the data specified.
Data can be specified by a list of minuends and subtrahends of montage
standards and/or a list of channel keys.
Args:
data_source: The DataSource for the waveform data.
request: A DataRequest proto instance.
max_samples: The maximum number of samples in one channel response.
Returns:
JSON format DataTable loaded with montage data.
Raises:
ValueError: The requested channels have multiple frequency types.
"""
sample_freq = GetSamplingFrequency(data_source, request.channel_data_ids)
# Initialize Dygraph data with a time axis of sampling frequency.
output_data, _ = utils.InitDataTableInputsWithTimeAxis(
sample_freq, request.chunk_duration_secs, request.chunk_start,
max_samples)
columns_order = ['seconds']
channel_data, channel_names = _CreateChannelData(
data_source,
request.channel_data_ids,
request.low_cut,
request.high_cut,
request.notch,
start=request.chunk_start,
duration=request.chunk_duration_secs,
max_samples=max_samples)
output_data = _AddDataTableSeries(channel_data, output_data)
columns_order.extend(channel_names)
return (utils.ConvertToDataTableJSon(output_data,
columns_order), sample_freq)