org.yamj.core.tools.web.HTMLTools.java Source code

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/*
 *      Copyright (c) 2004-2013 YAMJ Members
 *      https://github.com/organizations/YAMJ/teams
 *
 *      This file is part of the Yet Another Media Jukebox (YAMJ).
 *
 *      YAMJ is free software: you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation, either version 3 of the License, or
 *      any later version.
 *
 *      YAMJ is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with YAMJ.  If not, see <http://www.gnu.org/licenses/>.
 *
 *      Web: https://github.com/YAMJ/yamj-v3
 *
 */
package org.yamj.core.tools.web;

import org.apache.commons.lang3.StringUtils;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class HTMLTools {

    private static final Map<Character, String> AGGRESSIVE_HTML_ENCODE_MAP = new HashMap<Character, String>();
    private static final Map<Character, String> DEFENSIVE_HTML_ENCODE_MAP = new HashMap<Character, String>();
    private static final Map<String, Character> HTML_DECODE_MAP = new HashMap<String, Character>();
    private static final Logger LOG = LoggerFactory.getLogger(HTMLTools.class);

    static {
        /*
         * Html encoding mapping according to the HTML 4.0 spec
         * http://www.w3.org/TR/REC-html40/sgml/entities.html
         */

        // Special characters for HTML
        AGGRESSIVE_HTML_ENCODE_MAP.put('\u0026', "&amp;");
        AGGRESSIVE_HTML_ENCODE_MAP.put('\u003C', "&lt;");
        AGGRESSIVE_HTML_ENCODE_MAP.put('\u003E', "&gt;");
        AGGRESSIVE_HTML_ENCODE_MAP.put('\u0022', "&quot;");

        DEFENSIVE_HTML_ENCODE_MAP.put('\u0152', "&OElig;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0153', "&oelig;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0160', "&Scaron;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0161', "&scaron;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0178', "&Yuml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u02C6', "&circ;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u02DC', "&tilde;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2002', "&ensp;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2003', "&emsp;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2009', "&thinsp;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u200C', "&zwnj;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u200D', "&zwj;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u200E', "&lrm;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u200F', "&rlm;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2013', "&ndash;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2014', "&mdash;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2018', "&lsquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2019', "&rsquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u201A', "&sbquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u201C', "&ldquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u201D', "&rdquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u201E', "&bdquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2020', "&dagger;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2021', "&Dagger;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2030', "&permil;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2039', "&lsaquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u203A', "&rsaquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u20AC', "&euro;");

        // Character entity references for ISO 8859-1 characters
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A0', "&nbsp;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A1', "&iexcl;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A2', "&cent;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A3', "&pound;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A4', "&curren;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A5', "&yen;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A6', "&brvbar;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A7', "&sect;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A8', "&uml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00A9', "&copy;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00AA', "&ordf;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00AB', "&laquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00AC', "&not;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00AD', "&shy;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00AE', "&reg;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00AF', "&macr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B0', "&deg;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B1', "&plusmn;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B2', "&sup2;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B3', "&sup3;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B4', "&acute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B5', "&micro;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B6', "&para;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B7', "&middot;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B8', "&cedil;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00B9', "&sup1;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00BA', "&ordm;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00BB', "&raquo;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00BC', "&frac14;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00BD', "&frac12;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00BE', "&frac34;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00BF', "&iquest;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C0', "&Agrave;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C1', "&Aacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C2', "&Acirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C3', "&Atilde;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C4', "&Auml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C5', "&Aring;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C6', "&AElig;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C7', "&Ccedil;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C8', "&Egrave;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00C9', "&Eacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00CA', "&Ecirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00CB', "&Euml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00CC', "&Igrave;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00CD', "&Iacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00CE', "&Icirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00CF', "&Iuml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D0', "&ETH;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D1', "&Ntilde;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D2', "&Ograve;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D3', "&Oacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D4', "&Ocirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D5', "&Otilde;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D6', "&Ouml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D7', "&times;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D8', "&Oslash;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00D9', "&Ugrave;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00DA', "&Uacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00DB', "&Ucirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00DC', "&Uuml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00DD', "&Yacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00DE', "&THORN;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00DF', "&szlig;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E0', "&agrave;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E1', "&aacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E2', "&acirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E3', "&atilde;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E4', "&auml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E5', "&aring;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E6', "&aelig;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E7', "&ccedil;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E8', "&egrave;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00E9', "&eacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00EA', "&ecirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00EB', "&euml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00EC', "&igrave;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00ED', "&iacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00EE', "&icirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00EF', "&iuml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F0', "&eth;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F1', "&ntilde;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F2', "&ograve;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F3', "&oacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F4', "&ocirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F5', "&otilde;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F6', "&ouml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F7', "&divide;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F8', "&oslash;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00F9', "&ugrave;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00FA', "&uacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00FB', "&ucirc;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00FC', "&uuml;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00FD', "&yacute;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00FE', "&thorn;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u00FF', "&yuml;");

        // Mathematical, Greek and Symbolic characters for HTML
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0192', "&fnof;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0391', "&Alpha;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0392', "&Beta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0393', "&Gamma;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0394', "&Delta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0395', "&Epsilon;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0396', "&Zeta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0397', "&Eta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0398', "&Theta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u0399', "&Iota;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u039A', "&Kappa;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u039B', "&Lambda;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u039C', "&Mu;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u039D', "&Nu;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u039E', "&Xi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u039F', "&Omicron;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A0', "&Pi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A1', "&Rho;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A3', "&Sigma;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A4', "&Tau;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A5', "&Upsilon;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A6', "&Phi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A7', "&Chi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A8', "&Psi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03A9', "&Omega;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B1', "&alpha;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B2', "&beta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B3', "&gamma;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B4', "&delta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B5', "&epsilon;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B6', "&zeta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B7', "&eta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B8', "&theta;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03B9', "&iota;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03BA', "&kappa;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03BB', "&lambda;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03BC', "&mu;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03BD', "&nu;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03BE', "&xi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03BF', "&omicron;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C0', "&pi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C1', "&rho;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C2', "&sigmaf;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C3', "&sigma;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C4', "&tau;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C5', "&upsilon;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C6', "&phi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C7', "&chi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C8', "&psi;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03C9', "&omega;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03D1', "&thetasym;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03D2', "&upsih;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u03D6', "&piv;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2022', "&bull;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2026', "&hellip;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2032', "&prime;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2033', "&Prime;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u203E', "&oline;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2044', "&frasl;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2118', "&weierp;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2111', "&image;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u211C', "&real;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2122', "&trade;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2135', "&alefsym;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2190', "&larr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2191', "&uarr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2192', "&rarr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2193', "&darr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2194', "&harr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u21B5', "&crarr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u21D0', "&lArr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u21D1', "&uArr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u21D2', "&rArr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u21D3', "&dArr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u21D4', "&hArr;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2200', "&forall;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2202', "&part;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2203', "&exist;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2205', "&empty;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2207', "&nabla;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2208', "&isin;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2209', "&notin;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u220B', "&ni;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u220F', "&prod;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2211', "&sum;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2212', "&minus;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2217', "&lowast;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u221A', "&radic;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u221D', "&prop;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u221E', "&infin;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2220', "&ang;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2227', "&and;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2228', "&or;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2229', "&cap;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u222A', "&cup;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u222B', "&int;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2234', "&there4;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u223C', "&sim;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2245', "&cong;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2248', "&asymp;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2260', "&ne;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2261', "&equiv;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2264', "&le;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2265', "&ge;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2282', "&sub;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2283', "&sup;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2284', "&nsub;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2286', "&sube;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2287', "&supe;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2295', "&oplus;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2297', "&otimes;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u22A5', "&perp;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u22C5', "&sdot;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2308', "&lceil;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2309', "&rceil;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u230A', "&lfloor;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u230B', "&rfloor;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2329', "&lang;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u232A', "&rang;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u25CA', "&loz;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2660', "&spades;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2663', "&clubs;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2665', "&hearts;");
        DEFENSIVE_HTML_ENCODE_MAP.put('\u2666', "&diams;");

        Set<Map.Entry<Character, String>> aggresiveEntries = AGGRESSIVE_HTML_ENCODE_MAP.entrySet();
        for (Map.Entry<Character, String> entry : aggresiveEntries) {
            HTML_DECODE_MAP.put(entry.getValue(), entry.getKey());
        }

        Set<Map.Entry<Character, String>> defensiveEntries = DEFENSIVE_HTML_ENCODE_MAP.entrySet();
        for (Map.Entry<Character, String> entry : defensiveEntries) {
            HTML_DECODE_MAP.put(entry.getValue(), entry.getKey());
        }
    }

    private HTMLTools() {
        throw new UnsupportedOperationException("Utility class");
    }

    public static String decodeHtml(String source) {
        if (null == source || 0 == source.length()) {
            return source;
        }

        int currentIndex = 0;
        int delimiterStartIndex;
        int delimiterEndIndex;

        StringBuilder result = null;

        while (currentIndex <= source.length()) {
            delimiterStartIndex = source.indexOf('&', currentIndex);
            if (delimiterStartIndex != -1) {
                delimiterEndIndex = source.indexOf(';', delimiterStartIndex + 1);
                if (delimiterEndIndex != -1) {
                    // ensure that the string builder is setup correctly
                    if (null == result) {
                        result = new StringBuilder();
                    }

                    // add the text that leads up to this match
                    if (delimiterStartIndex > currentIndex) {
                        result.append(source.substring(currentIndex, delimiterStartIndex));
                    }

                    // add the decoded entity
                    String entity = source.substring(delimiterStartIndex, delimiterEndIndex + 1);

                    currentIndex = delimiterEndIndex + 1;

                    // try to decoded numeric entities
                    if (entity.charAt(1) == '#') {
                        int start = 2;
                        int radix = 10;
                        // check if the number is hexadecimal
                        if (entity.charAt(2) == 'X' || entity.charAt(2) == 'x') {
                            start++;
                            radix = 16;
                        }
                        try {
                            Character c = Character.valueOf(
                                    (char) Integer.parseInt(entity.substring(start, entity.length() - 1), radix));
                            result.append(c);
                        } // when the number of the entity can't be parsed, add the entity as-is
                        catch (NumberFormatException error) {
                            result.append(entity);
                        }
                    } else {
                        // try to decode the entity as a literal
                        Character decoded = HTML_DECODE_MAP.get(entity);
                        if (decoded != null) {
                            result.append(decoded);
                        } // if there was no match, add the entity as-is
                        else {
                            result.append(entity);
                        }
                    }
                } else {
                    break;
                }
            } else {
                break;
            }
        }

        if (null == result) {
            return source;
        } else if (currentIndex < source.length()) {
            result.append(source.substring(currentIndex));
        }

        return result.toString();
    }

    public static String decodeUrl(String url) {
        if (url != null && url.length() != 0) {
            try {
                return URLDecoder.decode(url, "UTF-8");
            } catch (UnsupportedEncodingException ignored) {
                LOG.info("Could not decode URL string '{}', will proceed with undecoded string.", url);
            }
        }
        return url;
    }

    public static String encodeUrl(String url) {
        String returnUrl = url;

        if (url != null && url.length() != 0) {
            try {
                returnUrl = URLEncoder.encode(url, "UTF-8");
                returnUrl = returnUrl.replace((CharSequence) "+", (CharSequence) "%20"); // why does URLEncoder do that??!!
            } catch (UnsupportedEncodingException ignored) {
                LOG.info("Could not decode URL string '{}', will proceed with undecoded string.", returnUrl);
            }
        }
        return returnUrl;
    }

    public static String encodeUrlPath(String url) {
        if (url != null && url.length() != 0) {
            int slash = url.lastIndexOf('/');
            String parentPart = "";
            if (slash != -1) {
                parentPart = encodeUrlPath(url.substring(0, slash)) + '/';
            }
            return parentPart + encodeUrl(url.substring(slash + 1));
        }
        return url;
    }

    public static List<String> extractHtmlTags(String src, String sectionStart, String sectionEnd, String startTag,
            String endTag) {
        ArrayList<String> tags = new ArrayList<String>();
        int index = src.indexOf(sectionStart);
        if (index == -1) {
            return tags;
        }
        index += sectionStart.length();
        int endIndex = src.indexOf(sectionEnd, index);
        if (endIndex == -1) {
            return tags;
        }

        String sectionText = src.substring(index, endIndex);
        int lastIndex = sectionText.length();
        index = 0;
        int endLen = endTag.length();

        if (startTag != null) {
            index = sectionText.indexOf(startTag);
        }

        while (index != -1) {
            endIndex = sectionText.indexOf(endTag, index);
            if (endIndex == -1) {
                endIndex = lastIndex;
            }
            endIndex += endLen;
            String text = sectionText.substring(index, endIndex);
            tags.add(text);
            if (endIndex > lastIndex) {
                break;
            }
            if (startTag != null) {
                index = sectionText.indexOf(startTag, endIndex);
            } else {
                index = endIndex;
            }
        }
        return tags;
    }

    public static String extractTag(String src, String findStr) {
        return extractTag(src, findStr, 0);
    }

    public static String extractTag(String src, String findStr, int skip) {
        return extractTag(src, findStr, skip, "><");
    }

    public static String extractTag(String src, String findStr, int skip, String separator) {
        return extractTag(src, findStr, skip, separator, true);
    }

    public static String extractTag(String src, String findStr, int skip, String separator, boolean checkDirty) {
        int beginIndex = src.indexOf(findStr);

        String value = StringUtils.EMPTY;

        if (beginIndex >= 0) {
            StringTokenizer st = new StringTokenizer(src.substring(beginIndex + findStr.length()), separator);
            for (int i = 0; i < skip; i++) {
                st.nextToken();
            }

            value = HTMLTools.decodeHtml(st.nextToken().trim());

            if (checkDirty && value.indexOf("uiv=\"content-ty") != -1 || value.indexOf("cast") != -1
                    || value.indexOf("title") != -1 || value.indexOf('<') != -1) {
                value = StringUtils.EMPTY;
            }
        }

        return value;
    }

    public static String extractTag(String src, String startStr, String endStr) {
        int beginIndex = src.indexOf(startStr);

        if (beginIndex < 0) {
            return StringUtils.EMPTY;
        }

        try {
            String subString = src.substring(beginIndex + startStr.length());
            int endIndex = subString.indexOf(endStr);
            if (endIndex < 0) {
                return StringUtils.EMPTY;
            }
            subString = subString.substring(0, endIndex);
            return HTMLTools.decodeHtml(subString.trim());
        } catch (Exception error) {
            return StringUtils.EMPTY;
        }
    }

    public static List<String> extractTags(String src, String sectionStart) {
        return extractTags(src, sectionStart, "</div>");
    }

    public static List<String> extractTags(String src, String sectionStart, String sectionEnd) {
        return extractTags(src, sectionStart, sectionEnd, null, "|");
    }

    public static List<String> extractTags(String src, String sectionStart, String sectionEnd, String startTag,
            String endTag) {
        return extractTags(src, sectionStart, sectionEnd, startTag, endTag, true);
    }

    public static List<String> extractTags(String src, String sectionStart, String sectionEnd, String startTag,
            String endTag, boolean forceCloseTag) {
        ArrayList<String> tags = new ArrayList<String>();
        int startIndex = src.indexOf(sectionStart);
        if (startIndex == -1) {
            return tags;
        }
        startIndex += sectionStart.length();
        int endIndex = src.indexOf(sectionEnd, startIndex);
        if (endIndex == -1) {
            return tags;
        }

        String sectionText = src.substring(startIndex, endIndex);
        int lastIndex = sectionText.length();
        startIndex = 0;
        int startLen = 0;
        int endLen = endTag.length();

        if (startTag != null) {
            startIndex = sectionText.indexOf(startTag);
            startLen = startTag.length();
        }

        while (startIndex != -1) {
            startIndex += startLen;
            if (forceCloseTag) {
                int close = sectionText.indexOf('>', startIndex);
                if (close != -1) {
                    startIndex = close + 1;
                }
            }
            endIndex = sectionText.indexOf(endTag, startIndex);
            if (endIndex == -1) {
                endIndex = lastIndex;
            }
            String text = sectionText.substring(startIndex, endIndex);

            tags.add(HTMLTools.decodeHtml(text.trim()));
            endIndex += endLen;
            if (endIndex > lastIndex) {
                break;
            }
            if (startTag != null) {
                startIndex = sectionText.indexOf(startTag, endIndex);
            } else {
                startIndex = endIndex;
            }
        }
        return tags;
    }

    public static String getTextAfterElem(String src, String findStr) {
        return getTextAfterElem(src, findStr, 0);
    }

    public static String getTextAfterElem(String src, String findStr, int skip) {
        return getTextAfterElem(src, findStr, skip, 0);
    }

    /**
     * Example: src = "<a id="specialID"><br/> <img src="a.gif"/>my text</a> findStr = "specialID" result = "my text"
     *
     * @param src html text
     * @param findStr string to find in src
     * @param skip count of found texts to skip
     * @param fromIndex begin index in src
     * @return string from html text which is plain text without html tags
     */
    public static String getTextAfterElem(String src, String findStr, int skip, int fromIndex) {
        int beginIndex = src.indexOf(findStr, fromIndex);
        if (beginIndex == -1) {
            return StringUtils.EMPTY;
        }
        StringTokenizer st = new StringTokenizer(src.substring(beginIndex + findStr.length()), "<");
        int i = 0;
        while (st.hasMoreElements()) {
            String elem = st.nextToken().replaceAll("&nbsp;|&#160;", "").trim();
            if (elem.length() != 0 && !elem.endsWith(">") && i++ >= skip) {
                String[] elems = elem.split(">");
                if (elems.length > 1) {
                    return HTMLTools.decodeHtml(elems[1].trim());
                } else {
                    return HTMLTools.decodeHtml(elems[0].trim());
                }
            }
        }
        return StringUtils.EMPTY;
    }

    public static String removeHtmlTags(String src) {
        return replaceHtmlTags(src, "");
    }

    public static String replaceHtmlTags(String src, String replacement) {
        return src.replaceAll("\\<.*?>", replacement);
    }

    public static String stripTags(String s) {
        Pattern stripTagsRegex = Pattern.compile("([^\\<]*)(?:\\<[^\\>]*\\>)?");
        Matcher m = stripTagsRegex.matcher(s);

        StringBuilder res = new StringBuilder();
        while (m.find()) {
            res.append(m.group(1));
        }

        // Replace escaped spaces
        String finalRes = res.toString().replaceAll("&nbsp;", " ");

        return finalRes.trim();
    }
}