PostUpdatePruner.java

    private static Set<Path> getAllowedFiles(final Path gameDirectory, final Manifest manifest)
    {
        return manifest.getManifestContent()
            .map(manifestContent -> {
                final List<FileEntry> debugFiles = manifestContent.getDebug();
                final List<FileEntry> releaseFiles = manifestContent.getRelease();
                final Map<String, ArchiveEntry> archives = manifestContent.getArchives();

                final Set<Path> paths = new HashSet<>(debugFiles.size() + releaseFiles.size() + archives.size());

                // Add files to paths set.
                for (final FileEntry fe : debugFiles)
                    paths.add(gameDirectory.resolve(fe.getName()));

                for (final FileEntry fe : releaseFiles)
                    paths.add(gameDirectory.resolve(fe.getName()));

                for (final String p : archives.keySet())
                    paths.add(gameDirectory.resolve(p + ".pak"));

                return paths;
            })
            .orElse(Collections.emptySet());
    }