protected long getFileLength(Path p) {
        if (p != null && Files.isRegularFile(p)) {
            try {
                return Files.size(p);
            } catch (IOException e) {
                //swallow
            }
        }
        return NON_EXISTENT_FILE_LENGTH;
    }
@param extractRootDir
@param relativeSourceFilePath
@return extractFile or null if couldn't find one.
tika-eval/tika-eval-app/src/main/java/org/apache/tika/eval/app/AbstractProfiler.java