net.jqwik.engine.providers.OptionalArbitraryProvider Maven / Gradle / Ivy

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package net.jqwik.engine.providers;

import java.util.*;

import net.jqwik.api.*;
import net.jqwik.api.providers.*;
import net.jqwik.api.support.*;

public class OptionalArbitraryProvider implements ArbitraryProvider {
	@Override
	public boolean canProvideFor(TypeUsage targetType) {
		return targetType.isOfType(Optional.class);
	}

	@Override
	public Set> provideFor(TypeUsage targetType, SubtypeProvider subtypeProvider) {
		TypeUsage innerType = targetType.getTypeArguments().get(0);
		return subtypeProvider.apply(innerType).stream() //
							  .map(Arbitrary::optional)
							  .collect(CollectorsSupport.toLinkedHashSet());
	}
}