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

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package net.jqwik.engine.providers;

import java.util.*;

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

public class NullableArbitraryProvider implements ArbitraryProvider {
	@Override
	public boolean canProvideFor(TypeUsage targetType) {
		return targetType.isNullable() && !targetType.isAnnotated(WithNull.class);
	}

	@Override
	public Set> provideFor(
		TypeUsage targetType,
		SubtypeProvider subtypeProvider
	) {
		TypeUsage nonNullType = targetType.asNotNullable();
		Set> rawArbitraries = subtypeProvider.apply(nonNullType);
		return rawArbitraries.stream()
				   .map(a -> a.injectNull(0.05))
				   .collect(CollectorsSupport.toLinkedHashSet());
	}

	@Override
	public int priority() {
		// Replace most providers if type is nullable
		return 101;
	}
}