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 * Image processing operations for SciJava Ops.
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package org.scijava.ops.image.threshold.apply;

import java.util.Comparator;
import java.util.function.Function;

import org.scijava.function.Computers;
import org.scijava.ops.spi.OpDependency;

import net.imglib2.type.logic.BitType;
import net.imglib2.type.numeric.RealType;

/**
 * Applies the given threshold value to every element along the given
 * {@link Iterable} input.
 *
 * @author Martin Horn (University of Konstanz)
 * @author Christian Dietz (University of Konstanz)
 * @implNote op names='threshold.apply'
 */
public class ApplyConstantThreshold<T extends RealType<T>> implements
	Computers.Arity3<Iterable<T>, T, Comparator<T>, Iterable<BitType>>
{

	@OpDependency(name = "threshold.apply")
	Computers.Arity3<T, T, Comparator<? super T>, BitType> applyThreshold;

	@OpDependency(name = "engine.adapt")
	Function<Computers.Arity1<T, BitType>, Computers.Arity1<Iterable<T>, Iterable<BitType>>> lifter;

	// TODO can/should the Comparator be of <? super T> instead of just <T>?
	/**
	 * TODO
	 *
	 * @param input
	 * @param threshold
	 * @param comparator
	 * @param output
	 */
	@Override
	public void compute(final Iterable<T> input, final T threshold,
		final Comparator<T> comparator, final Iterable<BitType> output)
	{
		Computers.Arity1<T, BitType> thresholdComputer = (in, out) -> applyThreshold
			.compute(in, threshold, comparator, out);
        var liftedThreshold = lifter
			.apply(thresholdComputer);
		liftedThreshold.accept(input, output);
	}

}

// -- CONVENIENCE OPS -- //

// If people don't want to / don't know how to make a comparator, they can just
// use this Op. The default comparator just returns true if the input is greater
// than the threshold.
/**
 * TODO: Remove in favor of a nullable parameter on the Op above
 *
 * @implNote op names='threshold.apply'
 */
class ApplyConstantThresholdSimple<T extends RealType<T>> implements
	Computers.Arity2<Iterable<T>, T, Iterable<BitType>>
{

	@OpDependency(name = "threshold.apply")
	Computers.Arity3<Iterable<T>, T, Comparator<T>, Iterable<BitType>> applyThreshold;

	// TODO can/should the Comparator be of <? super T> instead of just <T>?
	/**
	 * TODO
	 *
	 * @param input
	 * @param threshold
	 * @param output
	 */
	@Override
	public void compute(final Iterable<T> input, final T threshold,
		final Iterable<BitType> output)
	{

		applyThreshold.compute(input, threshold, Comparable::compareTo, output);
	}

}
