net.jqwik.engine.providers.AbstractCollectionArbitraryProvider 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.*;

abstract class AbstractCollectionArbitraryProvider implements ArbitraryProvider {

	@Override
	public boolean canProvideFor(TypeUsage targetType) {
		return targetType.isAssignableFrom(getProvidedType());
	}

	protected abstract Class getProvidedType();

	@Override
	public Set> provideFor(TypeUsage targetType, SubtypeProvider subtypeProvider) {
		TypeUsage elementType = targetType.getTypeArgument(0);
		Set> elementArbitraries = subtypeProvider.apply(elementType);
		return elementArbitraries.stream()
								 .map(this::create)
								 .collect(CollectorsSupport.toLinkedHashSet());
	}

	protected abstract Arbitrary create(Arbitrary innerArbitrary);

}