import javax.annotation.Nullable;

public class InputParameterUtils {
    @Nullable
    public static Object prepareInputParameterValue(InputPropertySpec inputProperty, Task task) {
        String propertyName = inputProperty.getPropertyName();
        try {
            return prepareInputParameterValue(inputProperty.getValue());
        } catch (Exception ex) {
            throw new PropertyEvaluationException(task, propertyName, ex);

        def visitor = new GetInputPropertiesVisitor()
        TaskPropertyUtils.visitProperties(walker, task, visitor)
        return visitor.properties.collectEntries { [it.propertyName, InputParameterUtils.prepareInputParameterValue(it.value)] }
    }

    def inputFileProperties() {
        def inputFiles = [:]
        TaskPropertyUtils.visitProperties(walker, task, new PropertyVisitor() {
            @Override

        Map<String, Object> result = new HashMap<>();
        for (InputPropertySpec inputProperty : visitor.getProperties()) {
            result.put(inputProperty.getPropertyName(), InputParameterUtils.prepareInputParameterValue(inputProperty, task));
        }
        return Collections.unmodifiableMap(result);
    }

    @Override
    public TaskInputPropertyBuilder property(final String name, @Nullable final Object value) {

        for (InputPropertySpec inputProperty : taskProperties.getInputProperties()) {
            visitor.visitInputProperty(
                inputProperty.getPropertyName(),
                () -> InputParameterUtils.prepareInputParameterValue(inputProperty, task));
        }
        for (InputFilePropertySpec inputFileProperty : taskProperties.getInputFileProperties()) {
            // SkipWhenEmpty implies incremental.

                        //   see https://github.com/gradle/gradle/issues/10846
                        Object preparedValue = InputParameterUtils.prepareInputParameterValue(value);

                        if (preparedValue == null && !optional) {
                            reportValueNotSet(propertyName, validationContext, true);
                        }