if (!PART_CHAR_MATCHER.matchesAllOf(asciiChars)) {
      return false;
    }

    // No initial or final dashes or underscores.

    if (DASH_MATCHER.matches(part.charAt(0))
        || DASH_MATCHER.matches(part.charAt(part.length() - 1))) {
      return false;
    }

    /*
     * Note that we allow (in contravention of a strict interpretation of the relevant RFCs) domain

                if (_klen == key.length()) {
                    match = _key.equals(key);
                } else if (_klen < key.length()) {
                    match = _key.regionMatches(0, key, 0, _klen) && key.charAt(_klen) == '\\';
                }

                if (match) {
                    dr = (DfsReferral) referrals.map.get(_key);
                }
            }
        }

        return dr;
    }

    }

    private static final String[] LLM_LOG_PACKAGES =
            { "org.codelibs.fess.llm", "org.codelibs.fess.chat", "org.codelibs.fess.api.chat", "org.codelibs.fess.app.web.chat" };

    /**
     * Sets the log level for LLM-related packages.
     *
     * @param level the log level to set
     */
    public void setLlmLogLevel(final String level) {

    // read char by char
    CharSequenceReader reader = new CharSequenceReader(charSequence);
    for (int i = 0; i < expected.length(); i++) {
      assertEquals(expected.charAt(i), reader.read());
    }
    assertFullyRead(reader);

    // read all to one array
    reader = new CharSequenceReader(charSequence);
    char[] buf = new char[expected.length()];

        final int strLen = str != null ? str.length() : 0;
        if (strLen > 0) {
            for (int i = 0; i < strLen; i++) {
                if (!Character.isWhitespace(str.charAt(i))) {
                    return;
                }
            }
        }
        throw new IllegalArgumentException(message);
    }

            int i = 0;
            do {
                if (i >= buf.length) {
                    final char[] nb = new char[buf.length * 2];
                    System.arraycopy(buf, 0, nb, 0, buf.length);
                    buf = nb;
                }
                buf[i++] = (char) peekc;
                peekc = read();
                peekct = peekc < 0 ? CT_WHITESPACE : peekc < 256 ? ctype[peekc] : CT_ALPHA;

     * @param hostname the hostname to check
     * @return whether this is an IP address
     */
    public static boolean isDotQuadIP(final String hostname) {
        if (Character.isDigit(hostname.charAt(0))) {
            int i, len, dots;
            char[] data;

            i = dots = 0; /* quick IP address validation */
            len = hostname.length();
            data = hostname.toCharArray();

  }

  private static void assertPutString(char[] chars) {
    Hasher h1 = new NonStreamingVersion().newHasher();
    Hasher h2 = new NonStreamingVersion().newHasher();
    String s = new String(chars);
    // this is the correct implementation of the spec
    for (int i = 0; i < s.length(); i++) {
      h1.putChar(s.charAt(i));
    }
    h2.putUnencodedChars(s);
    assertEquals(h1.hash(), h2.hash());
  }

            final int batchCount, final int batchSize) {
        super(config, SMB_COM_TRANSACTION2, TRANS2_FIND_FIRST2);
        if (filename.equals("\\") || (filename.charAt(filename.length() - 1) == '\\')) {
            this.path = filename;
        } else {
            this.path = filename + "\\";
        }
        this.wildcard = wildcard;

        if (cs == null || cs.isEmpty()) {
            return false;
        }
        final int sz = cs.length();
        for (int i = 0; i < sz; i++) {
            if (!Character.isDigit(cs.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    private static Integer getNextIntegerToken(String s) {
        if ((s.length() > 1) && s.startsWith("0")) {