public interface GradleApiSpecProvider {

    Spec get();

    interface Spec {
        /**
         * Set of classes which should be visible from the Gradle API ClassLoader.
         */
        Set<Class<?>> getExportedClasses();

        /**
         * Set of packages and enclosing sub-packages which should be visible from the Gradle API ClassLoader.
         *
         * Resources in those packages will also be visible.
         */

        for (Class<? extends GradleApiSpecProvider> provider : providers) {
            Spec spec = specFrom(provider);
            exportedClasses.addAll(spec.getExportedClasses());
            exportedPackages.addAll(spec.getExportedPackages());
            exportedResources.addAll(spec.getExportedResources());
            exportedResourcePrefixes.addAll(spec.getExportedResourcePrefixes());

import java.util.Set;

public class DefaultGradleApiSpecProvider extends GradleApiSpecProvider.SpecAdapter implements GradleApiSpecProvider {

    @Override
    public Set<Class<?>> getExportedClasses() {
        return ImmutableSet.<Class<?>>of(
            FastStringServiceFactory.class,
            DefaultFastStringServiceFactory.class
        );
    }

    @Override

        }
        for (String resourcePrefix : apiAggregate.getExportedResourcePrefixes()) {
            apiSpec.allowResources(resourcePrefix);
        }
        for (Class<?> clazz : apiAggregate.getExportedClasses()) {
            apiSpec.allowClass(clazz);
        }
        for (String packageName : apiAggregate.getExportedPackages()) {
            apiSpec.allowPackage(packageName);
        }
        return apiSpec;