return Optional.ofNullable(beforeExecutionState);
    }

    @Override
    public ImmutableSortedMap<String, ValueSnapshot> getInputProperties() {
        return getBeforeExecutionState()
            .map(BeforeExecutionState::getInputProperties)
            .orElseGet(super::getInputProperties);
    }

    @Override
    public ImmutableSortedMap<String, CurrentFileCollectionFingerprint> getInputFileProperties() {

            lastExecution.getInputProperties().keySet(),
            thisExecution.getInputProperties().keySet(),
            "Input",
            executable);
        ChangeContainer inputPropertyValueChanges = new InputValueChanges(
            lastExecution.getInputProperties(),
            thisExecution.getInputProperties(),
            executable);

        // Capture input files state

    }

    protected IdentityContext(IdentityContext parent) {
        this(parent, parent.getInputProperties(), parent.getInputFileProperties(), parent.getIdentity());
    }

    /**
     * All currently known input properties.
     */
    public ImmutableSortedMap<String, ValueSnapshot> getInputProperties() {
        return inputProperties;
    }

    /**
     * All currently known input file properties.

    }

    @Override
    public File asFile() {
        throw new UnsupportedOperationException("Cannot create file for char source " + charSource);
    }

    @Override
    public Object getInputProperties() {
        return null;
    }

    @Override
    public FileCollection getInputFiles() {
        return null;
    }

    @Override
    public TaskDependency getBuildDependencies() {

     */
    ImmutableList<ImplementationSnapshot> getAdditionalImplementations();

    /**
     * The non-file inputs.
     */
    ImmutableSortedMap<String, ValueSnapshot> getInputProperties();

    /**
     * The file inputs.
     */
    ImmutableSortedMap<String, ? extends FileCollectionFingerprint> getInputFileProperties();

        ImmutableSortedMap<String, ValueSnapshot> previousInputPropertySnapshots = previousExecutionState
            .map(ExecutionInputState::getInputProperties)
            .orElse(ImmutableSortedMap.of());
        ImmutableSortedMap<String, ? extends FileCollectionFingerprint> previousInputFileFingerprints = previousExecutionState

            return beforeExecutionState.getAdditionalImplementations();
        }

        @Override
        public ImmutableSortedMap<String, ValueSnapshot> getInputProperties() {
            return beforeExecutionState.getInputProperties();
        }

        @Override
        public ImmutableSortedMap<String, CurrentFileCollectionFingerprint> getInputFileProperties() {

    /**
     * The lifecycle aware values.
     */
    Iterable<? extends LifecycleAwareValue> getLifecycleAwareValues();

    /**
     * Input properties.
     */
    ImmutableSortedSet<InputPropertySpec> getInputProperties();

    /**
     * Input file properties.
     *
     * It is guaranteed that all the {@link InputFilePropertySpec}s have a name and that the names are unique.
     */

     * Not typically used directly.
     *
     * @return the input properties registered when this resource is used as task input
     */
    @Nullable
    @Optional
    @Input
    Object getInputProperties();

    /**
     * Returns the input files registered when this resource is used as task input.
     * Not typically used directly.
     *

    @Override
    public ImmutableList<ImplementationSnapshot> getAdditionalImplementations() {
        return additionalImplementations;
    }

    @Override
    public ImmutableSortedMap<String, ValueSnapshot> getInputProperties() {
        return inputProperties;
    }

    @Override
    public ImmutableSortedMap<String, C> getInputFileProperties() {
        return inputFileProperties;
    }