public void setInitialBufferSize(final int initialBufferSize) {
        this.initialBufferSize = initialBufferSize;
    }

    /**
     * Sets whether duplicated terms are replaced.
     * @param replaceDuplication If true, duplicated terms are replaced.
     */
    public void setReplaceDuplication(final boolean replaceDuplication) {
        this.replaceDuplication = replaceDuplication;
    }

    /**

   APPENDIX: How to apply the Apache License to your work.

      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "[]"
      replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
      comment syntax for the file format. We also recommend that a

     * where '*' is replaced with '.*' for pattern matching, and stored case-insensitively.
     *
     * @param directive The directive to add to the robots.txt rules
     */
    public void addDirective(final Directive directive) {
        directiveMap.put(Pattern.compile(directive.getUserAgent().replace("*", ".*"), Pattern.CASE_INSENSITIVE), directive);
    }

    /**

    }

    /**
     * Replaces credentials in the given value.
     * @param credentials The credentials.
     * @param value The value to replace.
     * @return The value with credentials replaced.
     */
    protected String replaceCredentials(final Credentials credentials, final String value) {
        if (StringUtil.isNotBlank(value)) {

   APPENDIX: How to apply the Apache License to your work.

      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "[]"
      replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
      comment syntax for the file format. We also recommend that a

        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to replace with new index.", e);
            }
            throw new SuggesterException("Failed to replace with new index.", e);
        }
    }

    /**
     * Switches the search alias to the current update index.
     */
    public void switchIndex() {

     */
    protected String path;

    /**
     * A string to replace ?.
     */
    protected String questionStr = "_QUEST_";

    /**
     * A string to replace :.
     */
    protected String colonStr = "_CLN_";

    /**
     * A string to replace ;.
     */
    protected String semicolonStr = "_SCLN_";

    /**
     * A string to replace &.
     */
    protected String ampersandStr = "_AMP_";

        final File targetFile = ResourceUtil.getResourceAsFile("test");
        String path = targetFile.getAbsolutePath();
        if (!path.startsWith("/")) {
            path = "/" + path.replace('\\', '/');
        }
        final String url = "file:" + path;

        final int maxCount = 3;
        final int numOfThread = 2;

        final File file = File.createTempFile("crawler-", "");

     * @return the escaped query string
     */
    public static String escapeWildcardQuery(final String query) {
        return query.replace("*", "\\*").replace("?", "\\?");
    }

            final String text = source.get(FieldNames.TEXT).toString();
            if (skipDuplicateWords) {
                final String duplicateCheckStr = text.replace(" ", "");
                if (words.stream().map(word -> word.replace(" ", "")).anyMatch(word -> word.equals(duplicateCheckStr))) {
                    // skip duplicate word.
                    continue;
                }
            }