import org.gradle.api.Describable;
import org.gradle.internal.snapshot.impl.ClassImplementationSnapshot;
import org.gradle.internal.snapshot.impl.ImplementationSnapshot;

public class ImplementationChanges implements ChangeContainer {
    private final ClassImplementationSnapshot previousImplementation;
    private final ImmutableList<ImplementationSnapshot> previousAdditionalImplementations;

        ImmutableList<ImplementationSnapshot> currentAdditionalImplementations = Cast.uncheckedNonnullCast(thisExecution.getAdditionalImplementations());
        ChangeContainer implementationChanges = new ImplementationChanges(
            previousImplementation, lastExecution.getAdditionalImplementations(),
            currentImplementation, currentAdditionalImplementations,
            executable);

        ClassImplementationSnapshot currentImpl, List<ClassImplementationSnapshot> currentAdditionalImpls
    ) {
        def visitor = new CollectingChangeVisitor()
        new ImplementationChanges(
                previousImpl, ImmutableList.copyOf(previousAdditionalImpls),
                currentImpl, ImmutableList.copyOf(currentAdditionalImpls),
                executable
        ).accept(visitor)