import javax.annotation.Nullable;

/**
 * Visits properties of beans which are inputs, outputs, destroyables, local state, service references or software types.
 */
public interface PropertyVisitor {

    }

    def inputFileProperties() {
        def inputFiles = [:]
        TaskPropertyUtils.visitProperties(walker, task, new PropertyVisitor() {
            @Override
            void visitInputFileProperty(
                String propertyName,
                boolean optional,
                InputBehavior behavior,
                DirectorySensitivity emptyDirectorySensitivity,

                } else {
                    throw new IllegalStateException("Unknown normalization annotation used: " + fileNormalization);
                }
            })
            .orElse(null);
        visitor.visitInputFileProperty(
            propertyName,
            propertyMetadata.isAnnotationPresent(Optional.class),
            determineBehavior(propertyMetadata),
            determineDirectorySensitivity(propertyMetadata),

        TaskPropertyUtils.visitProperties(propertyWalker, task, new PropertyVisitor() {
            @Override
            public void visitInputFileProperty(
                String propertyName,
                boolean optional,
                InputBehavior behavior,
                DirectorySensitivity directorySensitivity,