public static AttributeMap getMeta(final Path parentDir) {
        final List<Path> metaPaths = FileUtil.listChildPaths(parentDir, path ->
                Files.isRegularFile(path)
                && StroomZipFileType.META.hasExtension(path));
        if (metaPaths.isEmpty()) {
            return null;
        } else if (metaPaths.size() > 1) {
            throw new RuntimeException("Found >1 meta files in " + parentDir);
        } else {
            final AttributeMap attributeMap = new AttributeMap();
            try {
                AttributeMapUtil.read(metaPaths.getFirst(), attributeMap);
                return attributeMap;
            } catch (IOException e) {
                throw new UncheckedIOException(e);
            }
        }
    }
Get the {@link AttributeMap} for the single .meta file in parentDir, or null
if not found
stroom-proxy/stroom-proxy-app/src/test/java/stroom/proxy/app/handler/TestDataUtil.java