public static final String TIKA_TESSERACT_CONFIG = "tika.tesseract.config";

    public static final String TIKA_PDF_CONFIG = "tika.pdf.config";

    public static final String NORMALIZE_TEXT = "normalize_text";

    private static final String FILE_PASSWORD = "fess.file.password";

    protected String outputEncoding = Constants.UTF_8;

    protected boolean readAsTextIfFailed = false;

        if (configParam != null) {
            final String keepOriginalBody = configParam.get(Config.KEEP_ORIGINAL_BODY);
            if (StringUtil.isNotBlank(keepOriginalBody)) {
                params.put(TikaExtractor.NORMALIZE_TEXT,
                        Constants.TRUE.equalsIgnoreCase(keepOriginalBody) ? Constants.FALSE : Constants.TRUE);
            }
        }
        return params;
    }

        assertEquals("", normalizeText(" ", 100, -1, 2, false));
        assertEquals("", normalizeText("  ", 100, -1, 2, false));
        assertEquals("", normalizeText("\t", 100, -1, 2, false));
        assertEquals("", normalizeText("\t\t", 100, -1, 2, false));
        assertEquals("", normalizeText("\t \t", 100, -1, 2, false));
        assertEquals("123 abc", normalizeText(" 123 abc ", 100, -1, 2, false));

            return StringUtil.EMPTY; // empty
        }

        final int[] spaceChars = getSpaceChars();
        try (final Reader reader = new StringReader(title)) {
            return TextUtil.normalizeText(reader).initialCapacity(title.length()).spaceChars(spaceChars).execute();
        } catch (final IOException e) {
            return StringUtil.EMPTY; // empty
        }
    }

        public TextNormalizeContext spaceChars(final int[] spaceChars) {
            this.spaceChars = spaceChars;
            return this;
        }
    }

    public static TextNormalizeContext normalizeText(final Reader reader) {
        return new TextNormalizeContext(reader);
    }

    private static boolean isLastSpaceChar(final StringBuilder buf) {
        if (buf.length() == 0) {
            return false;