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 * Java implementation of the SciJava Ops matching engine.
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package org.scijava.ops.engine.util;

import com.google.common.collect.Streams;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.scijava.function.Computers;
import org.scijava.ops.api.OpBuilder;
import org.scijava.ops.engine.AbstractTestEnvironment;
import org.scijava.ops.engine.TestOps;
import org.scijava.types.Nil;

public class LiftTest extends AbstractTestEnvironment {

	@BeforeAll
	public static void AddNeededOps() {
		Object[] objects = objsFromNoArgConstructors(TestOps.class
			.getDeclaredClasses());
		ops.register(objects);
	}

	Nil<Double> nilDouble = new Nil<>() {};

	Nil<double[]> nilDoubleArray = new Nil<>() {};

	@Test
	public void testliftFunction() {
		Function<Double, Double> powFunction = OpBuilder.matchFunction(ops,
			"test.liftFunction", nilDouble, nilDouble);

		Function<Iterable<Double>, Iterable<Double>> liftedToIterable =
			Maps.FunctionMaps.Iterables.liftBoth(powFunction);
		Iterable<Double> res2 = liftedToIterable.apply(Arrays.asList(1.0, 2.0, 3.0,
			4.0));
		Assertions.assertTrue(arrayEquals(toArray(res2), 2.0, 3.0, 4.0, 5.0));

		Function<Double[], Double[]> liftedToArray = Maps.FunctionMaps.Arrays
			.liftBoth(powFunction, Double.class);
		Double[] res3 = liftedToArray.apply(new Double[] { 1.0, 2.0, 3.0, 4.0 });
		Assertions.assertTrue(arrayEquals(Arrays.stream(res3).mapToDouble(d -> d)
			.toArray(), 2.0, 3.0, 4.0, 5.0));
	}

	private static double[] toArray(Iterable<Double> iter) {
		return Streams.stream(iter).mapToDouble(d -> d).toArray();
	}

	@Test
	public void testliftComputer() {

		Computers.Arity1<double[], double[]> powComputer = OpBuilder.matchComputer(
			ops, "test.liftComputer", nilDoubleArray, nilDoubleArray);

		Computers.Arity1<Iterable<double[]>, Iterable<double[]>> liftedToIterable =
			Maps.ComputerMaps.Iterables.liftBoth(powComputer);
		Iterable<double[]> res = wrap(new double[4]);
		liftedToIterable.compute(wrap(new double[] { 1.0, 2.0, 3.0, 4.0 }), res);

		Assertions.assertTrue(arrayEquals(unwrap(res), 2.0, 3.0, 4.0, 5.0));
	}

	private static double[] unwrap(Iterable<double[]> ds) {
		List<Double> wraps = new ArrayList<>();
		for (double[] d : ds) {
			wraps.add(d[0]);
		}
		return wraps.stream().mapToDouble(d -> d).toArray();
	}

	private static Iterable<double[]> wrap(double... ds) {
		List<double[]> wraps = new ArrayList<>();
		for (double d : ds) {
			wraps.add(new double[] { d });
		}
		return wraps;
	}
}
