*/
package org.codelibs.fess.crawler.util;

/**
 * Utility class for character-related operations.
 */
public final class CharUtil {
    /**
     * Private constructor to prevent instantiation of this utility class.
     */
    private CharUtil() {
    }

    /**
     * Checks if the given character is a valid URL character.
     *
     * Valid URL characters include:

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;

import org.codelibs.fess.Constants;
import org.codelibs.fess.crawler.util.CharUtil;
import org.codelibs.fess.taglib.FessFunctions;
import org.lastaflute.web.util.LaRequestUtil;

import jakarta.servlet.http.HttpServletRequest;

/**
 * Utility class for document data manipulation and type conversion.

import org.codelibs.core.net.URLUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.app.web.base.FessSearchAction;
import org.codelibs.fess.app.web.error.ErrorAction;
import org.codelibs.fess.crawler.util.CharUtil;
import org.codelibs.fess.helper.PathMappingHelper;
import org.codelibs.fess.helper.SearchLogHelper;
import org.codelibs.fess.helper.ViewHelper;
import org.codelibs.fess.opensearch.log.exentity.ClickLog;

import org.codelibs.fess.app.service.ScheduledJobService;
import org.codelibs.fess.app.service.WebConfigService;
import org.codelibs.fess.app.web.base.FessAdminAction;
import org.codelibs.fess.crawler.util.CharUtil;
import org.codelibs.fess.helper.ProcessHelper;
import org.codelibs.fess.opensearch.config.exentity.FileConfig;
import org.codelibs.fess.opensearch.config.exentity.ScheduledJob;

import org.codelibs.fess.crawler.exception.CrawlingAccessException;
import org.codelibs.fess.crawler.helper.EncodingHelper;
import org.codelibs.fess.crawler.helper.UrlConvertHelper;
import org.codelibs.fess.crawler.util.CharUtil;
import org.codelibs.fess.crawler.util.XPathAPI;
import org.codelibs.nekohtml.parsers.DOMParser;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.lang.ThreadUtil;
import org.codelibs.core.misc.Pair;
import org.codelibs.fess.Constants;
import org.codelibs.fess.crawler.util.CharUtil;
import org.codelibs.fess.exception.FessSystemException;
import org.codelibs.fess.mylasta.action.FessMessages;
import org.codelibs.fess.mylasta.action.FessUserBean;
import org.codelibs.fess.mylasta.direction.FessConfig;

import org.codelibs.fess.crawler.client.CrawlerClient;
import org.codelibs.fess.crawler.client.CrawlerClientFactory;
import org.codelibs.fess.crawler.entity.ResponseData;
import org.codelibs.fess.crawler.util.CharUtil;
import org.codelibs.fess.entity.FacetQueryView;
import org.codelibs.fess.entity.HighlightInfo;
import org.codelibs.fess.entity.SearchRenderData;
import org.codelibs.fess.exception.FessSystemException;