AndSpec<? super TaskInternal> upToDateSpec = task.getOutputs().getUpToDateSpec();
        if (!properties.hasDeclaredOutputs() && upToDateSpec.isEmpty()) {
            if (requiresInputChanges(task)) {
                throw new InvalidUserCodeException("You must declare outputs or use `TaskOutputs.upToDateWhen()` when using the incremental task API");
            } else {

     */
    boolean requiresDependencies();

    /**
     * Whether the transformer requires {@link InputChanges} to be injected.
     */
    boolean requiresInputChanges();

    /**
     * Whether the transformer is cacheable.
     */
    boolean isCacheable();

    }

    @Override
    public boolean requiresDependencies() {
        return requiresDependencies;
    }

    @Override
    public boolean requiresInputChanges() {
        return requiresInputChanges;
    }

    @Override
    public boolean isCacheable() {
        return cacheable;
    }

    @Override

            );
            effectiveEngine = executionEngine;
        } else {
            effectiveEngine = producerProject.getServices().get(ExecutionEngine.class);
            if (!transform.requiresInputChanges()) {
                // Non-incremental project artifact transforms also run in an immutable workspace
                identityCache = immutableWorkspaceServices.getIdentityCache();

    private static File getResultsFile(File workspace) {
        return new File(workspace, "results.bin");
    }

    @Override
    public ExecutionBehavior getExecutionBehavior() {
        return transform.requiresInputChanges()
            ? ExecutionBehavior.INCREMENTAL
            : ExecutionBehavior.NON_INCREMENTAL;
    }

    @Override
    public void visitImplementations(ImplementationVisitor visitor) {