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//# Associated Universities, Inc. Washington DC, USA.
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#include <imageanalysis/ImageAnalysis/LinearPolarizationCalculator.h>

using namespace casacore;
namespace casa {

const String LinearPolarizationCalculator::CLASS_NAME = "LinearPolarizationCalculator";

LinearPolarizationCalculator::LinearPolarizationCalculator(
    const SPCIIF image, const String& outname, Bool overwrite
) : ImagePolTask(image, outname, overwrite) {}

LinearPolarizationCalculator::~LinearPolarizationCalculator() {}

SPIIF LinearPolarizationCalculator::compute() {
    *_getLog() << LogOrigin(CLASS_NAME, __func__, WHERE);
    auto q = _getStokesImage(Q);
    auto u = _getStokesImage(U);
    ThrowIf(
        ! q || ! u,
        "This image does not have Stokes Q and/or U so cannot compute linear polarization"
    );
    _checkQUBeams(false);
    auto node = _makePolIntNode(_debias, _clip, _sigma, True, False);
    // Make expression
    LatticeExpr<Float> le(node);
    ImageExpr<Float> ie(le, String("LinearlyPolarizedIntensity"));
    ie.setUnits(_getImage()->units());
    _setInfo(ie, Q);
    // Fiddle Stokes coordinate in ImageExpr
    _fiddleStokesCoordinate(ie, Stokes::Plinear);
    auto out = _prepareOutputImage(ie);
    if (_debias) {
        _maskAndZeroNaNs(out);
    }
    return out;
}

String LinearPolarizationCalculator::getClass() const {
    return CLASS_NAME;
}


void LinearPolarizationCalculator::setClip(Float clip) {
    _clip = clip;
}

void LinearPolarizationCalculator::setDebias(Bool debias) {
    _debias = debias;
}

void LinearPolarizationCalculator::setSigma(Float sigma) {
    _sigma = sigma;
}

}