setSupplier(new FixedSupplier<>(value.getFixedValue(), Cast.uncheckedCast(value.getSideEffect())));
        } else {
            CollectingProvider<T, C> asCollectingProvider = Cast.uncheckedNonnullCast(value.getChangingValue());
            setSupplier(new CollectingSupplier(new ElementsFromCollectionProvider<>(asCollectingProvider)));
        }
    }

    @Override

            this.provider = ignoreAbsent ? neverMissing(Cast.uncheckedNonnullCast(provider)) : provider;
            this.ignoreAbsent = ignoreAbsent;
        }

        @Nonnull
        private static <T> ProviderInternal<? extends Iterable<? extends T>> neverMissing(ProviderInternal<Iterable<? extends T>> provider) {
            return Cast.uncheckedNonnullCast(provider.orElse(ImmutableList.of()));
        }

        @Override

            setSupplier(noValueSupplier());
        } else if (value.hasFixedValue()) {
            setSupplier(new FixedSupplier<>(uncheckedNonnullCast(value.getFixedValue()), uncheckedCast(value.getSideEffect())));
        } else {
            CollectingProvider<K, V> asCollectingProvider = uncheckedNonnullCast(value.getChangingValue());
            setSupplier(new CollectingSupplier(new EntriesFromMapProvider<>(asCollectingProvider)));
        }

        Class<? extends BuildCacheServiceFactory<C>> castFactoryType = Cast.uncheckedNonnullCast(
            buildCacheConfiguration.getBuildCacheServiceFactoryType(configuration.getClass())
        );

        BuildCacheServiceFactory<C> factory = instantiator.newInstance(castFactoryType);
        Describer describer = new Describer();
        S service = Cast.uncheckedNonnullCast(factory.createBuildCacheService(configuration, describer));

    }

    public BroadcastDispatch<T> add(String methodName, Action<?> action) {
        assertIsMethod(methodName);
        return add(action, new ActionInvocationHandler(methodName, Cast.<Action<Object>>uncheckedNonnullCast(action)));
    }

    abstract BroadcastDispatch<T> add(Object handler, Dispatch<MethodInvocation> dispatch);

    private void assertIsMethod(String methodName) {
        for (Method method : type.getMethods()) {

        final Element<T> element = new Element<>(provider.getType(), new ElementFromProvider<>(provider), this::doAddRealized);
        if (provider instanceof ChangingValue) {
            Cast.<ChangingValue<T>>uncheckedNonnullCast(provider).onValueChange(previousValue -> clearCachedElement(element));
        }
        return element;
    }

    Element<T> cachingElement(CollectionProviderInternal<T, ? extends Iterable<T>> provider) {

import java.util.Optional;
import java.util.Set;

import static org.gradle.internal.Cast.cast;
import static org.gradle.internal.Cast.castNullable;
import static org.gradle.internal.Cast.uncheckedNonnullCast;

@SuppressWarnings("join_with_collect")
public abstract class CollectionUtils {

    /**
     * Returns null if the collection is empty otherwise expects a {@link #single(Iterable)} element to be found.

    public static <T extends Collection<?>> T flattenElements(Object... elements) {
        Collection<T> out = new LinkedList<T>();
        flatten(elements, out, true);
        return Cast.uncheckedNonnullCast(out);
    }

    public static <T extends Collection<?>> T flatten(Collection<?> elements, T addTo, boolean flattenMapsAndArrays) {
        return flatten(elements, addTo, flattenMapsAndArrays, flattenMapsAndArrays);

        return Cast.uncheckedNonnullCast(super.respondsTo(obj, name, argTypes));
    }

    /**
     * This is overridden just to make the compiler happy about the unchecked conversions.
     */
    @Override
    public List<MetaMethod> respondsTo(Object obj, String name) {
        return Cast.uncheckedNonnullCast(super.respondsTo(obj, name));
    }
    //endregion

            testServices.get(IdGenerator.class),
            testServices.get(ActorFactory.class),
            testServices.get(Clock.class)
        );
        IdGenerator<Object> idGenerator = Cast.uncheckedNonnullCast(testServices.get(IdGenerator.class));

        targetProcessor = new WorkerTestClassProcessor(targetProcessor, idGenerator.generateId(),
                workerProcessContext.getDisplayName(), testServices.get(Clock.class));