001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018/* Taken from: http://svn.apache.org/viewvc/commons/proper/lang/trunk/src/java/org/apache/commons/lang/Entities.java?revision=636641 */
019package org.openstreetmap.josm.data.validation.util;
020
021import java.util.HashMap;
022import java.util.Map;
023
024/**
025 * <p>
026 * Provides HTML and XML entity utilities.
027 * </p>
028 * @see <a href="http://hotwired.lycos.com/webmonkey/reference/special_characters/">ISO Entities</a>
029 * @see <a href="http://www.w3.org/TR/REC-html32#latin1">HTML 3.2 Character Entities for ISO Latin-1</a>
030 * @see <a href="http://www.w3.org/TR/REC-html40/sgml/entities.html">HTML 4.0 Character entity references</a>
031 * @see <a href="http://www.w3.org/TR/html401/charset.html#h-5.3">HTML 4.01 Character References</a>
032 * @see <a href="http://www.w3.org/TR/html401/charset.html#code-position">HTML 4.01 Code positions</a>
033 */
034public class Entities {
035    private static final String[][] ARRAY = {
036        /* BASIC */
037        {"quot", "34"}, // " - double-quote
038        {"amp", "38"}, // & - ampersand
039        {"lt", "60"}, // < - less-than
040        {"gt", "62"}, // > - greater-than
041        /* XML */
042        {"apos", "39"}, // XML apostrophe
043        /* ISO8859_1 */
044        {"nbsp", "160"}, // non-breaking space
045        {"iexcl", "161"}, // inverted exclamation mark
046        {"cent", "162"}, // cent sign
047        {"pound", "163"}, // pound sign
048        {"curren", "164"}, // currency sign
049        {"yen", "165"}, // yen sign = yuan sign
050        {"brvbar", "166"}, // broken bar = broken vertical bar
051        {"sect", "167"}, // section sign
052        {"uml", "168"}, // diaeresis = spacing diaeresis
053        {"copy", "169"}, // © - copyright sign
054        {"ordf", "170"}, // feminine ordinal indicator
055        {"laquo", "171"}, // left-pointing double angle quotation mark = left pointing guillemet
056        {"not", "172"}, // not sign
057        {"shy", "173"}, // soft hyphen = discretionary hyphen
058        {"reg", "174"}, // ® - registered trademark sign
059        {"macr", "175"}, // macron = spacing macron = overline = APL overbar
060        {"deg", "176"}, // degree sign
061        {"plusmn", "177"}, // plus-minus sign = plus-or-minus sign
062        {"sup2", "178"}, // superscript two = superscript digit two = squared
063        {"sup3", "179"}, // superscript three = superscript digit three = cubed
064        {"acute", "180"}, // acute accent = spacing acute
065        {"micro", "181"}, // micro sign
066        {"para", "182"}, // pilcrow sign = paragraph sign
067        {"middot", "183"}, // middle dot = Georgian comma = Greek middle dot
068        {"cedil", "184"}, // cedilla = spacing cedilla
069        {"sup1", "185"}, // superscript one = superscript digit one
070        {"ordm", "186"}, // masculine ordinal indicator
071        {"raquo", "187"}, // right-pointing double angle quotation mark = right pointing guillemet
072        {"frac14", "188"}, // vulgar fraction one quarter = fraction one quarter
073        {"frac12", "189"}, // vulgar fraction one half = fraction one half
074        {"frac34", "190"}, // vulgar fraction three quarters = fraction three quarters
075        {"iquest", "191"}, // inverted question mark = turned question mark
076        {"Agrave", "192"}, // À - uppercase A, grave accent
077        {"Aacute", "193"}, // Á - uppercase A, acute accent
078        {"Acirc", "194"}, // Â - uppercase A, circumflex accent
079        {"Atilde", "195"}, // Ã - uppercase A, tilde
080        {"Auml", "196"}, // Ä - uppercase A, umlaut
081        {"Aring", "197"}, // Å - uppercase A, ring
082        {"AElig", "198"}, // Æ - uppercase AE
083        {"Ccedil", "199"}, // Ç - uppercase C, cedilla
084        {"Egrave", "200"}, // È - uppercase E, grave accent
085        {"Eacute", "201"}, // É - uppercase E, acute accent
086        {"Ecirc", "202"}, // Ê - uppercase E, circumflex accent
087        {"Euml", "203"}, // Ë - uppercase E, umlaut
088        {"Igrave", "204"}, // Ì - uppercase I, grave accent
089        {"Iacute", "205"}, // Í - uppercase I, acute accent
090        {"Icirc", "206"}, // Î - uppercase I, circumflex accent
091        {"Iuml", "207"}, // Ï - uppercase I, umlaut
092        {"ETH", "208"}, // Ð - uppercase Eth, Icelandic
093        {"Ntilde", "209"}, // Ñ - uppercase N, tilde
094        {"Ograve", "210"}, // Ò - uppercase O, grave accent
095        {"Oacute", "211"}, // Ó - uppercase O, acute accent
096        {"Ocirc", "212"}, // Ô - uppercase O, circumflex accent
097        {"Otilde", "213"}, // Õ - uppercase O, tilde
098        {"Ouml", "214"}, // Ö - uppercase O, umlaut
099        {"times", "215"}, // multiplication sign
100        {"Oslash", "216"}, // Ø - uppercase O, slash
101        {"Ugrave", "217"}, // Ù - uppercase U, grave accent
102        {"Uacute", "218"}, // Ú - uppercase U, acute accent
103        {"Ucirc", "219"}, // Û - uppercase U, circumflex accent
104        {"Uuml", "220"}, // Ü - uppercase U, umlaut
105        {"Yacute", "221"}, // Ý - uppercase Y, acute accent
106        {"THORN", "222"}, // Þ - uppercase THORN, Icelandic
107        {"szlig", "223"}, // ß - lowercase sharps, German
108        {"agrave", "224"}, // à - lowercase a, grave accent
109        {"aacute", "225"}, // á - lowercase a, acute accent
110        {"acirc", "226"}, // â - lowercase a, circumflex accent
111        {"atilde", "227"}, // ã - lowercase a, tilde
112        {"auml", "228"}, // ä - lowercase a, umlaut
113        {"aring", "229"}, // å - lowercase a, ring
114        {"aelig", "230"}, // æ - lowercase ae
115        {"ccedil", "231"}, // ç - lowercase c, cedilla
116        {"egrave", "232"}, // è - lowercase e, grave accent
117        {"eacute", "233"}, // é - lowercase e, acute accent
118        {"ecirc", "234"}, // ê - lowercase e, circumflex accent
119        {"euml", "235"}, // ë - lowercase e, umlaut
120        {"igrave", "236"}, // ì - lowercase i, grave accent
121        {"iacute", "237"}, // í - lowercase i, acute accent
122        {"icirc", "238"}, // î - lowercase i, circumflex accent
123        {"iuml", "239"}, // ï - lowercase i, umlaut
124        {"eth", "240"}, // ð - lowercase eth, Icelandic
125        {"ntilde", "241"}, // ñ - lowercase n, tilde
126        {"ograve", "242"}, // ò - lowercase o, grave accent
127        {"oacute", "243"}, // ó - lowercase o, acute accent
128        {"ocirc", "244"}, // ô - lowercase o, circumflex accent
129        {"otilde", "245"}, // õ - lowercase o, tilde
130        {"ouml", "246"}, // ö - lowercase o, umlaut
131        {"divide", "247"}, // division sign
132        {"oslash", "248"}, // ø - lowercase o, slash
133        {"ugrave", "249"}, // ù - lowercase u, grave accent
134        {"uacute", "250"}, // ú - lowercase u, acute accent
135        {"ucirc", "251"}, // û - lowercase u, circumflex accent
136        {"uuml", "252"}, // ü - lowercase u, umlaut
137        {"yacute", "253"}, // ý - lowercase y, acute accent
138        {"thorn", "254"}, // þ - lowercase thorn, Icelandic
139        {"yuml", "255"}, // ÿ - lowercase y, umlaut
140        /* HTML 40 */
141        // <!-- Latin Extended-B -->
142        {"fnof", "402"}, // latin small f with hook = function= florin, U+0192 ISOtech -->
143        // <!-- Greek -->
144        {"Alpha", "913"}, // greek capital letter alpha, U+0391 -->
145        {"Beta", "914"}, // greek capital letter beta, U+0392 -->
146        {"Gamma", "915"}, // greek capital letter gamma,U+0393 ISOgrk3 -->
147        {"Delta", "916"}, // greek capital letter delta,U+0394 ISOgrk3 -->
148        {"Epsilon", "917"}, // greek capital letter epsilon, U+0395 -->
149        {"Zeta", "918"}, // greek capital letter zeta, U+0396 -->
150        {"Eta", "919"}, // greek capital letter eta, U+0397 -->
151        {"Theta", "920"}, // greek capital letter theta,U+0398 ISOgrk3 -->
152        {"Iota", "921"}, // greek capital letter iota, U+0399 -->
153        {"Kappa", "922"}, // greek capital letter kappa, U+039A -->
154        {"Lambda", "923"}, // greek capital letter lambda,U+039B ISOgrk3 -->
155        {"Mu", "924"}, // greek capital letter mu, U+039C -->
156        {"Nu", "925"}, // greek capital letter nu, U+039D -->
157        {"Xi", "926"}, // greek capital letter xi, U+039E ISOgrk3 -->
158        {"Omicron", "927"}, // greek capital letter omicron, U+039F -->
159        {"Pi", "928"}, // greek capital letter pi, U+03A0 ISOgrk3 -->
160        {"Rho", "929"}, // greek capital letter rho, U+03A1 -->
161        // <!-- there is no Sigmaf, and no U+03A2 character either -->
162        {"Sigma", "931"}, // greek capital letter sigma,U+03A3 ISOgrk3 -->
163        {"Tau", "932"}, // greek capital letter tau, U+03A4 -->
164        {"Upsilon", "933"}, // greek capital letter upsilon,U+03A5 ISOgrk3 -->
165        {"Phi", "934"}, // greek capital letter phi,U+03A6 ISOgrk3 -->
166        {"Chi", "935"}, // greek capital letter chi, U+03A7 -->
167        {"Psi", "936"}, // greek capital letter psi,U+03A8 ISOgrk3 -->
168        {"Omega", "937"}, // greek capital letter omega,U+03A9 ISOgrk3 -->
169        {"alpha", "945"}, // greek small letter alpha,U+03B1 ISOgrk3 -->
170        {"beta", "946"}, // greek small letter beta, U+03B2 ISOgrk3 -->
171        {"gamma", "947"}, // greek small letter gamma,U+03B3 ISOgrk3 -->
172        {"delta", "948"}, // greek small letter delta,U+03B4 ISOgrk3 -->
173        {"epsilon", "949"}, // greek small letter epsilon,U+03B5 ISOgrk3 -->
174        {"zeta", "950"}, // greek small letter zeta, U+03B6 ISOgrk3 -->
175        {"eta", "951"}, // greek small letter eta, U+03B7 ISOgrk3 -->
176        {"theta", "952"}, // greek small letter theta,U+03B8 ISOgrk3 -->
177        {"iota", "953"}, // greek small letter iota, U+03B9 ISOgrk3 -->
178        {"kappa", "954"}, // greek small letter kappa,U+03BA ISOgrk3 -->
179        {"lambda", "955"}, // greek small letter lambda,U+03BB ISOgrk3 -->
180        {"mu", "956"}, // greek small letter mu, U+03BC ISOgrk3 -->
181        {"nu", "957"}, // greek small letter nu, U+03BD ISOgrk3 -->
182        {"xi", "958"}, // greek small letter xi, U+03BE ISOgrk3 -->
183        {"omicron", "959"}, // greek small letter omicron, U+03BF NEW -->
184        {"pi", "960"}, // greek small letter pi, U+03C0 ISOgrk3 -->
185        {"rho", "961"}, // greek small letter rho, U+03C1 ISOgrk3 -->
186        {"sigmaf", "962"}, // greek small letter final sigma,U+03C2 ISOgrk3 -->
187        {"sigma", "963"}, // greek small letter sigma,U+03C3 ISOgrk3 -->
188        {"tau", "964"}, // greek small letter tau, U+03C4 ISOgrk3 -->
189        {"upsilon", "965"}, // greek small letter upsilon,U+03C5 ISOgrk3 -->
190        {"phi", "966"}, // greek small letter phi, U+03C6 ISOgrk3 -->
191        {"chi", "967"}, // greek small letter chi, U+03C7 ISOgrk3 -->
192        {"psi", "968"}, // greek small letter psi, U+03C8 ISOgrk3 -->
193        {"omega", "969"}, // greek small letter omega,U+03C9 ISOgrk3 -->
194        {"thetasym", "977"}, // greek small letter theta symbol,U+03D1 NEW -->
195        {"upsih", "978"}, // greek upsilon with hook symbol,U+03D2 NEW -->
196        {"piv", "982"}, // greek pi symbol, U+03D6 ISOgrk3 -->
197        // <!-- General Punctuation -->
198        {"bull", "8226"}, // bullet = black small circle,U+2022 ISOpub -->
199        // <!-- bullet is NOT the same as bullet operator, U+2219 -->
200        {"hellip", "8230"}, // horizontal ellipsis = three dot leader,U+2026 ISOpub -->
201        {"prime", "8242"}, // prime = minutes = feet, U+2032 ISOtech -->
202        {"Prime", "8243"}, // double prime = seconds = inches,U+2033 ISOtech -->
203        {"oline", "8254"}, // overline = spacing overscore,U+203E NEW -->
204        {"frasl", "8260"}, // fraction slash, U+2044 NEW -->
205        // <!-- Letterlike Symbols -->
206        {"weierp", "8472"}, // script capital P = power set= Weierstrass p, U+2118 ISOamso -->
207        {"image", "8465"}, // blackletter capital I = imaginary part,U+2111 ISOamso -->
208        {"real", "8476"}, // blackletter capital R = real part symbol,U+211C ISOamso -->
209        {"trade", "8482"}, // trade mark sign, U+2122 ISOnum -->
210        {"alefsym", "8501"}, // alef symbol = first transfinite cardinal,U+2135 NEW -->
211        // <!-- alef symbol is NOT the same as hebrew letter alef,U+05D0 although the
212        // same glyph could be used to depict both characters -->
213        // <!-- Arrows -->
214        {"larr", "8592"}, // leftwards arrow, U+2190 ISOnum -->
215        {"uarr", "8593"}, // upwards arrow, U+2191 ISOnum-->
216        {"rarr", "8594"}, // rightwards arrow, U+2192 ISOnum -->
217        {"darr", "8595"}, // downwards arrow, U+2193 ISOnum -->
218        {"harr", "8596"}, // left right arrow, U+2194 ISOamsa -->
219        {"crarr", "8629"}, // downwards arrow with corner leftwards= carriage return, U+21B5 NEW -->
220        {"lArr", "8656"}, // leftwards double arrow, U+21D0 ISOtech -->
221        // <!-- ISO 10646 does not say that lArr is the same as the 'is implied by'
222        // arrow but also does not have any other character for that function.
223        // So ? lArr canbe used for 'is implied by' as ISOtech suggests -->
224        {"uArr", "8657"}, // upwards double arrow, U+21D1 ISOamsa -->
225        {"rArr", "8658"}, // rightwards double arrow,U+21D2 ISOtech -->
226        // <!-- ISO 10646 does not say this is the 'implies' character but does not
227        // have another character with this function so ?rArr can be used for
228        // 'implies' as ISOtech suggests -->
229        {"dArr", "8659"}, // downwards double arrow, U+21D3 ISOamsa -->
230        {"hArr", "8660"}, // left right double arrow,U+21D4 ISOamsa -->
231        // <!-- Mathematical Operators -->
232        {"forall", "8704"}, // for all, U+2200 ISOtech -->
233        {"part", "8706"}, // partial differential, U+2202 ISOtech -->
234        {"exist", "8707"}, // there exists, U+2203 ISOtech -->
235        {"empty", "8709"}, // empty set = null set = diameter,U+2205 ISOamso -->
236        {"nabla", "8711"}, // nabla = backward difference,U+2207 ISOtech -->
237        {"isin", "8712"}, // element of, U+2208 ISOtech -->
238        {"notin", "8713"}, // not an element of, U+2209 ISOtech -->
239        {"ni", "8715"}, // contains as member, U+220B ISOtech -->
240        // <!-- should there be a more memorable name than 'ni'? -->
241        {"prod", "8719"}, // n-ary product = product sign,U+220F ISOamsb -->
242        // <!-- prod is NOT the same character as U+03A0 'greek capital letter pi'
243        // though the same glyph might be used for both -->
244        {"sum", "8721"}, // n-ary summation, U+2211 ISOamsb -->
245        // <!-- sum is NOT the same character as U+03A3 'greek capital letter sigma'
246        // though the same glyph might be used for both -->
247        {"minus", "8722"}, // minus sign, U+2212 ISOtech -->
248        {"lowast", "8727"}, // asterisk operator, U+2217 ISOtech -->
249        {"radic", "8730"}, // square root = radical sign,U+221A ISOtech -->
250        {"prop", "8733"}, // proportional to, U+221D ISOtech -->
251        {"infin", "8734"}, // infinity, U+221E ISOtech -->
252        {"ang", "8736"}, // angle, U+2220 ISOamso -->
253        {"and", "8743"}, // logical and = wedge, U+2227 ISOtech -->
254        {"or", "8744"}, // logical or = vee, U+2228 ISOtech -->
255        {"cap", "8745"}, // intersection = cap, U+2229 ISOtech -->
256        {"cup", "8746"}, // union = cup, U+222A ISOtech -->
257        {"int", "8747"}, // integral, U+222B ISOtech -->
258        {"there4", "8756"}, // therefore, U+2234 ISOtech -->
259        {"sim", "8764"}, // tilde operator = varies with = similar to,U+223C ISOtech -->
260        // <!-- tilde operator is NOT the same character as the tilde, U+007E,although
261        // the same glyph might be used to represent both -->
262        {"cong", "8773"}, // approximately equal to, U+2245 ISOtech -->
263        {"asymp", "8776"}, // almost equal to = asymptotic to,U+2248 ISOamsr -->
264        {"ne", "8800"}, // not equal to, U+2260 ISOtech -->
265        {"equiv", "8801"}, // identical to, U+2261 ISOtech -->
266        {"le", "8804"}, // less-than or equal to, U+2264 ISOtech -->
267        {"ge", "8805"}, // greater-than or equal to,U+2265 ISOtech -->
268        {"sub", "8834"}, // subset of, U+2282 ISOtech -->
269        {"sup", "8835"}, // superset of, U+2283 ISOtech -->
270        // <!-- note that nsup, 'not a superset of, U+2283' is not covered by the
271        // Symbol font encoding and is not included. Should it be, for symmetry?
272        // It is in ISOamsn --> <!ENTITY nsub", "8836"},
273        // not a subset of, U+2284 ISOamsn -->
274        {"sube", "8838"}, // subset of or equal to, U+2286 ISOtech -->
275        {"supe", "8839"}, // superset of or equal to,U+2287 ISOtech -->
276        {"oplus", "8853"}, // circled plus = direct sum,U+2295 ISOamsb -->
277        {"otimes", "8855"}, // circled times = vector product,U+2297 ISOamsb -->
278        {"perp", "8869"}, // up tack = orthogonal to = perpendicular,U+22A5 ISOtech -->
279        {"sdot", "8901"}, // dot operator, U+22C5 ISOamsb -->
280        // <!-- dot operator is NOT the same character as U+00B7 middle dot -->
281        // <!-- Miscellaneous Technical -->
282        {"lceil", "8968"}, // left ceiling = apl upstile,U+2308 ISOamsc -->
283        {"rceil", "8969"}, // right ceiling, U+2309 ISOamsc -->
284        {"lfloor", "8970"}, // left floor = apl downstile,U+230A ISOamsc -->
285        {"rfloor", "8971"}, // right floor, U+230B ISOamsc -->
286        {"lang", "9001"}, // left-pointing angle bracket = bra,U+2329 ISOtech -->
287        // <!-- lang is NOT the same character as U+003C 'less than' or U+2039 'single left-pointing angle quotation
288        // mark' -->
289        {"rang", "9002"}, // right-pointing angle bracket = ket,U+232A ISOtech -->
290        // <!-- rang is NOT the same character as U+003E 'greater than' or U+203A
291        // 'single right-pointing angle quotation mark' -->
292        // <!-- Geometric Shapes -->
293        {"loz", "9674"}, // lozenge, U+25CA ISOpub -->
294        // <!-- Miscellaneous Symbols -->
295        {"spades", "9824"}, // black spade suit, U+2660 ISOpub -->
296        // <!-- black here seems to mean filled as opposed to hollow -->
297        {"clubs", "9827"}, // black club suit = shamrock,U+2663 ISOpub -->
298        {"hearts", "9829"}, // black heart suit = valentine,U+2665 ISOpub -->
299        {"diams", "9830"}, // black diamond suit, U+2666 ISOpub -->
300
301        // <!-- Latin Extended-A -->
302        {"OElig", "338"}, // -- latin capital ligature OE,U+0152 ISOlat2 -->
303        {"oelig", "339"}, // -- latin small ligature oe, U+0153 ISOlat2 -->
304        // <!-- ligature is a misnomer, this is a separate character in some languages -->
305        {"Scaron", "352"}, // -- latin capital letter S with caron,U+0160 ISOlat2 -->
306        {"scaron", "353"}, // -- latin small letter s with caron,U+0161 ISOlat2 -->
307        {"Yuml", "376"}, // -- latin capital letter Y with diaeresis,U+0178 ISOlat2 -->
308        // <!-- Spacing Modifier Letters -->
309        {"circ", "710"}, // -- modifier letter circumflex accent,U+02C6 ISOpub -->
310        {"tilde", "732"}, // small tilde, U+02DC ISOdia -->
311        // <!-- General Punctuation -->
312        {"ensp", "8194"}, // en space, U+2002 ISOpub -->
313        {"emsp", "8195"}, // em space, U+2003 ISOpub -->
314        {"thinsp", "8201"}, // thin space, U+2009 ISOpub -->
315        {"zwnj", "8204"}, // zero width non-joiner,U+200C NEW RFC 2070 -->
316        {"zwj", "8205"}, // zero width joiner, U+200D NEW RFC 2070 -->
317        {"lrm", "8206"}, // left-to-right mark, U+200E NEW RFC 2070 -->
318        {"rlm", "8207"}, // right-to-left mark, U+200F NEW RFC 2070 -->
319        {"ndash", "8211"}, // en dash, U+2013 ISOpub -->
320        {"mdash", "8212"}, // em dash, U+2014 ISOpub -->
321        {"lsquo", "8216"}, // left single quotation mark,U+2018 ISOnum -->
322        {"rsquo", "8217"}, // right single quotation mark,U+2019 ISOnum -->
323        {"sbquo", "8218"}, // single low-9 quotation mark, U+201A NEW -->
324        {"ldquo", "8220"}, // left double quotation mark,U+201C ISOnum -->
325        {"rdquo", "8221"}, // right double quotation mark,U+201D ISOnum -->
326        {"bdquo", "8222"}, // double low-9 quotation mark, U+201E NEW -->
327        {"dagger", "8224"}, // dagger, U+2020 ISOpub -->
328        {"Dagger", "8225"}, // double dagger, U+2021 ISOpub -->
329        {"permil", "8240"}, // per mille sign, U+2030 ISOtech -->
330        {"lsaquo", "8249"}, // single left-pointing angle quotation mark,U+2039 ISO proposed -->
331        // <!-- lsaquo is proposed but not yet ISO standardized -->
332        {"rsaquo", "8250"}, // single right-pointing angle quotation mark,U+203A ISO proposed -->
333        // <!-- rsaquo is proposed but not yet ISO standardized -->
334        {"euro", "8364"}, // -- euro sign, U+20AC NEW -->
335    };
336
337    private static Map<String, String> mapNameToValue = null;
338
339    public String unescape(String str) {
340        int firstAmp = str.indexOf('&');
341        if (firstAmp < 0)
342            return str;
343        String res = str.substring(0, firstAmp);
344        int len = str.length();
345        for (int i = firstAmp; i < len; i++) {
346            char c = str.charAt(i);
347            if (c == '&') {
348                int nextIdx = i + 1;
349                int semiColonIdx = str.indexOf(';', nextIdx);
350                if (semiColonIdx == -1) {
351                    res += c;
352                    continue;
353                }
354                int amphersandIdx = str.indexOf('&', i + 1);
355                if (amphersandIdx != -1 && amphersandIdx < semiColonIdx) {
356                    // Then the text looks like &...&...;
357                    res += c;
358                    continue;
359                }
360                String entityContent = str.substring(nextIdx, semiColonIdx);
361                int entityValue = -1;
362                int entityContentLen = entityContent.length();
363                if (entityContentLen > 0) {
364                    if (entityContent.charAt(0) == '#') { // escaped value content is an integer (decimal or
365                        // hexidecimal)
366                        if (entityContentLen > 1) {
367                            char isHexChar = entityContent.charAt(1);
368                            try {
369                                switch (isHexChar) {
370                                    case 'X' :
371                                    case 'x' : {
372                                        entityValue = Integer.parseInt(entityContent.substring(2), 16);
373                                        break;
374                                    }
375                                    default : {
376                                        entityValue = Integer.parseInt(entityContent.substring(1), 10);
377                                    }
378                                }
379                                if (entityValue > 0xFFFF) {
380                                    entityValue = -1;
381                                }
382                            } catch (NumberFormatException e) {
383                                entityValue = -1;
384                            }
385                        }
386                    } else { // escaped value content is an entity name
387                        if(mapNameToValue == null)
388                        {
389                            mapNameToValue = new HashMap<String, String>();
390                            for (String[] pair : ARRAY)
391                                mapNameToValue.put(pair[0], pair[1]);
392                        }
393                        String value = mapNameToValue.get(entityContent);
394                        entityValue = (value == null ? -1 : Integer.parseInt(value));
395                    }
396                }
397
398                if (entityValue == -1) {
399                    res += '&' + entityContent + ';';
400                } else {
401                    res += (char) entityValue;
402                }
403                i = semiColonIdx; // move index up to the semi-colon
404            } else {
405                res += c;
406            }
407        }
408        return res;
409    }
410}