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#include "msselection.h"
#include <aocommon/logger.h>
#include <limits>
namespace wsclean {
bool SelectMsChannels(schaapcommon::reordering::MSSelection& selection,
const aocommon::MultiBandData& msBands, size_t dataDescId,
const ImagingTableEntry& entry) {
const aocommon::BandData& band = msBands[dataDescId];
double firstCh = band.ChannelFrequency(0);
double lastCh = band.ChannelFrequency(band.ChannelCount() - 1);
// Some mses have decreasing (i.e. reversed) channel frequencies in them
bool isReversed = false;
if (firstCh > lastCh) {
std::swap(firstCh, lastCh);
isReversed = true;
aocommon::Logger::Debug
<< "Warning: MS has reversed channel frequencies.\n";
}
if (band.ChannelCount() != 0 && entry.lowestFrequency <= lastCh &&
entry.highestFrequency >= firstCh) {
size_t newStart, newEnd;
if (isReversed) {
aocommon::BandData::const_reverse_iterator lowPtr =
std::lower_bound(band.rbegin(), band.rend(), entry.lowestFrequency);
aocommon::BandData::const_reverse_iterator highPtr =
std::lower_bound(lowPtr, band.rend(), entry.highestFrequency);
if (highPtr == band.rend()) --highPtr;
newStart = band.ChannelCount() - 1 - (highPtr - band.rbegin());
newEnd = band.ChannelCount() - (lowPtr - band.rbegin());
} else {
const double *lowPtr, *highPtr;
lowPtr =
std::lower_bound(band.begin(), band.end(), entry.lowestFrequency);
highPtr = std::lower_bound(lowPtr, band.end(), entry.highestFrequency);
if (highPtr == band.end()) --highPtr;
newStart = lowPtr - band.begin();
newEnd = highPtr - band.begin() + 1;
}
selection.SetBandId(dataDescId);
selection.SetChannelRange(newStart, newEnd);
return true;
} else {
return false;
}
}
} // namespace wsclean
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