/**
* Copyright 2005-2014 Restlet
*
* The contents of this file are subject to the terms of one of the following
* open source licenses: Apache 2.0 or or EPL 1.0 (the "Licenses"). You can
* select the license that you prefer but you may not use this file except in
* compliance with one of these Licenses.
*
* You can obtain a copy of the Apache 2.0 license at
* http://www.opensource.org/licenses/apache-2.0
*
* You can obtain a copy of the EPL 1.0 license at
* http://www.opensource.org/licenses/eclipse-1.0
*
* See the Licenses for the specific language governing permissions and
* limitations under the Licenses.
*
* Alternatively, you can obtain a royalty free commercial license with less
* limitations, transferable or non-transferable, directly at
* http://restlet.com/products/restlet-framework
*
* Restlet is a registered trademark of Restlet S.A.S.
*/
package org.restlet.engine.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
/**
* String manipulation utilities.
*
* @author Jerome Louvel
*/
public class StringUtils {
/**
* Represents an XML or HTML character entity reference.
*
* @author Thierry Boileau
*
*/
private static class CharacterEntity {
/** Character reference. */
private String name;
/** Numeric character reference. */
private Integer numericValue;
/**
* Constructor.
*
* @param numericValue
* The numeric value of the entity.
* @param name
* the name of the entity.
*/
public CharacterEntity(Integer numericValue, String name) {
super();
this.numericValue = numericValue;
this.name = name;
}
/**
* Returns the name of the entity.
*
* @return The name of the entity.
*/
public String getName() {
return name;
}
/**
* Returns the numeric value of the entity.
*
* @return The numeric value of the entity.
*/
public Integer getNumericValue() {
return numericValue;
}
}
/**
* Stores a list en entities and is able to return one given its numeric
* value or name.
*
* @author Thierry Boileau
*
*/
private static class CharacterEntitySolver {
/** Map of names of entities according to their numeric value. */
private String[] toName;
/** Map of numeric values of entities according to their name. */
private Map<String, Integer> toValue;
/**
* Constructor.
*/
public CharacterEntitySolver() {
toName = new String[10000];
toValue = new HashMap<String, Integer>();
}
/**
* Adds an entity to solve.
*
* @param value
* The numeric value of the entity.
* @param name
* The name of the entity.
* @return The solver.
*/
public void add(Integer value, String name) {
toName[value] = name;
toValue.put(name, value);
}
/**
* Returns the entity name according to its numeric value.
*
* @param value
* The numeric value of the entity.
* @return The entity name according to its numeric value.
*/
public String getName(int value) {
return toName[value];
}
/**
* Returns the numeric value of an entity according to its name.
*
* @param name
* The name of the entity.
* @return The numeric value of an entity according to its name.
*/
public Integer getValue(String name) {
return toValue.get(name);
}
}
/** Entities defined for HTML 4.0. */
private static CharacterEntitySolver html40Entities;
/** Entities defined in http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent. */
private static List<CharacterEntity> htmlLat1;
/** Entities defined in http://www.w3.org/TR/xhtml1/DTD/xhtml-special.ent. */
private static List<CharacterEntity> htmlSpecial;
/** Entities defined in http://www.w3.org/TR/xhtml1/DTD/xhtml-symbol.ent. */
private static List<CharacterEntity> htmlSymbol;
/** Basic entities. */
private static List<CharacterEntity> xml10;
static {
xml10 = new ArrayList<CharacterEntity>();
xml10.add(new CharacterEntity(34, "quot"));
xml10.add(new CharacterEntity(38, "amp"));
xml10.add(new CharacterEntity(62, "gt"));
xml10.add(new CharacterEntity(60, "lt"));
htmlLat1 = new ArrayList<CharacterEntity>();
htmlLat1.add(new CharacterEntity(160, "nbsp"));
htmlLat1.add(new CharacterEntity(161, "iexcl"));
htmlLat1.add(new CharacterEntity(162, "cent"));
htmlLat1.add(new CharacterEntity(163, "pound"));
htmlLat1.add(new CharacterEntity(164, "curren"));
htmlLat1.add(new CharacterEntity(165, "yen"));
htmlLat1.add(new CharacterEntity(166, "brvbar"));
htmlLat1.add(new CharacterEntity(167, "sect"));
htmlLat1.add(new CharacterEntity(168, "uml"));
htmlLat1.add(new CharacterEntity(169, "copy"));
htmlLat1.add(new CharacterEntity(170, "ordf"));
htmlLat1.add(new CharacterEntity(171, "laquo"));
htmlLat1.add(new CharacterEntity(172, "not"));
htmlLat1.add(new CharacterEntity(173, "shy"));
htmlLat1.add(new CharacterEntity(174, "reg"));
htmlLat1.add(new CharacterEntity(175, "macr"));
htmlLat1.add(new CharacterEntity(176, "deg"));
htmlLat1.add(new CharacterEntity(177, "plusmn"));
htmlLat1.add(new CharacterEntity(178, "sup2"));
htmlLat1.add(new CharacterEntity(179, "sup3"));
htmlLat1.add(new CharacterEntity(180, "acute"));
htmlLat1.add(new CharacterEntity(181, "micro"));
htmlLat1.add(new CharacterEntity(182, "para"));
htmlLat1.add(new CharacterEntity(183, "middot"));
htmlLat1.add(new CharacterEntity(184, "cedil"));
htmlLat1.add(new CharacterEntity(185, "sup1"));
htmlLat1.add(new CharacterEntity(186, "ordm"));
htmlLat1.add(new CharacterEntity(187, "raquo"));
htmlLat1.add(new CharacterEntity(188, "frac14"));
htmlLat1.add(new CharacterEntity(189, "frac12"));
htmlLat1.add(new CharacterEntity(190, "frac34"));
htmlLat1.add(new CharacterEntity(191, "iquest"));
htmlLat1.add(new CharacterEntity(192, "Agrave"));
htmlLat1.add(new CharacterEntity(193, "Aacute"));
htmlLat1.add(new CharacterEntity(194, "Acirc"));
htmlLat1.add(new CharacterEntity(195, "Atilde"));
htmlLat1.add(new CharacterEntity(196, "Auml"));
htmlLat1.add(new CharacterEntity(197, "Aring"));
htmlLat1.add(new CharacterEntity(198, "AElig"));
htmlLat1.add(new CharacterEntity(199, "Ccedil"));
htmlLat1.add(new CharacterEntity(200, "Egrave"));
htmlLat1.add(new CharacterEntity(201, "Eacute"));
htmlLat1.add(new CharacterEntity(202, "Ecirc"));
htmlLat1.add(new CharacterEntity(203, "Euml"));
htmlLat1.add(new CharacterEntity(204, "Igrave"));
htmlLat1.add(new CharacterEntity(205, "Iacute"));
htmlLat1.add(new CharacterEntity(206, "Icirc"));
htmlLat1.add(new CharacterEntity(207, "Iuml"));
htmlLat1.add(new CharacterEntity(208, "ETH"));
htmlLat1.add(new CharacterEntity(209, "Ntilde"));
htmlLat1.add(new CharacterEntity(210, "Ograve"));
htmlLat1.add(new CharacterEntity(211, "Oacute"));
htmlLat1.add(new CharacterEntity(212, "Ocirc"));
htmlLat1.add(new CharacterEntity(213, "Otilde"));
htmlLat1.add(new CharacterEntity(214, "Ouml"));
htmlLat1.add(new CharacterEntity(215, "times"));
htmlLat1.add(new CharacterEntity(216, "Oslash"));
htmlLat1.add(new CharacterEntity(217, "Ugrave"));
htmlLat1.add(new CharacterEntity(218, "Uacute"));
htmlLat1.add(new CharacterEntity(219, "Ucirc"));
htmlLat1.add(new CharacterEntity(220, "Uuml"));
htmlLat1.add(new CharacterEntity(221, "Yacute"));
htmlLat1.add(new CharacterEntity(222, "THORN"));
htmlLat1.add(new CharacterEntity(223, "szlig"));
htmlLat1.add(new CharacterEntity(224, "agrave"));
htmlLat1.add(new CharacterEntity(225, "aacute"));
htmlLat1.add(new CharacterEntity(226, "acirc"));
htmlLat1.add(new CharacterEntity(227, "atilde"));
htmlLat1.add(new CharacterEntity(228, "auml"));
htmlLat1.add(new CharacterEntity(229, "aring"));
htmlLat1.add(new CharacterEntity(230, "aelig"));
htmlLat1.add(new CharacterEntity(231, "ccedil"));
htmlLat1.add(new CharacterEntity(232, "egrave"));
htmlLat1.add(new CharacterEntity(233, "eacute"));
htmlLat1.add(new CharacterEntity(234, "ecirc"));
htmlLat1.add(new CharacterEntity(235, "euml"));
htmlLat1.add(new CharacterEntity(236, "igrave"));
htmlLat1.add(new CharacterEntity(237, "iacute"));
htmlLat1.add(new CharacterEntity(238, "icirc"));
htmlLat1.add(new CharacterEntity(239, "iuml"));
htmlLat1.add(new CharacterEntity(240, "eth"));
htmlLat1.add(new CharacterEntity(241, "ntilde"));
htmlLat1.add(new CharacterEntity(242, "ograve"));
htmlLat1.add(new CharacterEntity(243, "oacute"));
htmlLat1.add(new CharacterEntity(244, "ocirc"));
htmlLat1.add(new CharacterEntity(245, "otilde"));
htmlLat1.add(new CharacterEntity(246, "ouml"));
htmlLat1.add(new CharacterEntity(247, "divide"));
htmlLat1.add(new CharacterEntity(248, "oslash"));
htmlLat1.add(new CharacterEntity(249, "ugrave"));
htmlLat1.add(new CharacterEntity(250, "uacute"));
htmlLat1.add(new CharacterEntity(251, "ucirc"));
htmlLat1.add(new CharacterEntity(252, "uuml"));
htmlLat1.add(new CharacterEntity(253, "yacute"));
htmlLat1.add(new CharacterEntity(254, "thorn"));
htmlLat1.add(new CharacterEntity(255, "yuml"));
htmlSymbol = new ArrayList<CharacterEntity>();
htmlSymbol.add(new CharacterEntity(402, "fnof"));
htmlSymbol.add(new CharacterEntity(913, "Alpha"));
htmlSymbol.add(new CharacterEntity(914, "Beta"));
htmlSymbol.add(new CharacterEntity(915, "Gamma"));
htmlSymbol.add(new CharacterEntity(916, "Delta"));
htmlSymbol.add(new CharacterEntity(917, "Epsilon"));
htmlSymbol.add(new CharacterEntity(918, "Zeta"));
htmlSymbol.add(new CharacterEntity(919, "Eta"));
htmlSymbol.add(new CharacterEntity(920, "Theta"));
htmlSymbol.add(new CharacterEntity(921, "Iota"));
htmlSymbol.add(new CharacterEntity(922, "Kappa"));
htmlSymbol.add(new CharacterEntity(923, "Lambda"));
htmlSymbol.add(new CharacterEntity(924, "Mu"));
htmlSymbol.add(new CharacterEntity(925, "Nu"));
htmlSymbol.add(new CharacterEntity(926, "Xi"));
htmlSymbol.add(new CharacterEntity(927, "Omicron"));
htmlSymbol.add(new CharacterEntity(928, "Pi"));
htmlSymbol.add(new CharacterEntity(929, "Rho"));
htmlSymbol.add(new CharacterEntity(931, "Sigma"));
htmlSymbol.add(new CharacterEntity(932, "Tau"));
htmlSymbol.add(new CharacterEntity(933, "Upsilon"));
htmlSymbol.add(new CharacterEntity(934, "Phi"));
htmlSymbol.add(new CharacterEntity(935, "Chi"));
htmlSymbol.add(new CharacterEntity(936, "Psi"));
htmlSymbol.add(new CharacterEntity(937, "Omega"));
htmlSymbol.add(new CharacterEntity(945, "alpha"));
htmlSymbol.add(new CharacterEntity(946, "beta"));
htmlSymbol.add(new CharacterEntity(947, "gamma"));
htmlSymbol.add(new CharacterEntity(948, "delta"));
htmlSymbol.add(new CharacterEntity(949, "epsilon"));
htmlSymbol.add(new CharacterEntity(950, "zeta"));
htmlSymbol.add(new CharacterEntity(951, "eta"));
htmlSymbol.add(new CharacterEntity(952, "theta"));
htmlSymbol.add(new CharacterEntity(953, "iota"));
htmlSymbol.add(new CharacterEntity(954, "kappa"));
htmlSymbol.add(new CharacterEntity(955, "lambda"));
htmlSymbol.add(new CharacterEntity(956, "mu"));
htmlSymbol.add(new CharacterEntity(957, "nu"));
htmlSymbol.add(new CharacterEntity(958, "xi"));
htmlSymbol.add(new CharacterEntity(959, "omicron"));
htmlSymbol.add(new CharacterEntity(960, "pi"));
htmlSymbol.add(new CharacterEntity(961, "rho"));
htmlSymbol.add(new CharacterEntity(962, "sigmaf"));
htmlSymbol.add(new CharacterEntity(963, "sigma"));
htmlSymbol.add(new CharacterEntity(964, "tau"));
htmlSymbol.add(new CharacterEntity(965, "upsilon"));
htmlSymbol.add(new CharacterEntity(966, "phi"));
htmlSymbol.add(new CharacterEntity(967, "chi"));
htmlSymbol.add(new CharacterEntity(968, "psi"));
htmlSymbol.add(new CharacterEntity(969, "omega"));
htmlSymbol.add(new CharacterEntity(977, "thetasym"));
htmlSymbol.add(new CharacterEntity(978, "upsih"));
htmlSymbol.add(new CharacterEntity(982, "piv"));
htmlSymbol.add(new CharacterEntity(8230, "hellip"));
htmlSymbol.add(new CharacterEntity(8242, "prime"));
htmlSymbol.add(new CharacterEntity(8243, "Prime"));
htmlSymbol.add(new CharacterEntity(8254, "oline"));
htmlSymbol.add(new CharacterEntity(8260, "frasl"));
htmlSymbol.add(new CharacterEntity(8465, "image"));
htmlSymbol.add(new CharacterEntity(8472, "weierp"));
htmlSymbol.add(new CharacterEntity(8476, "real"));
htmlSymbol.add(new CharacterEntity(8482, "trade"));
htmlSymbol.add(new CharacterEntity(8501, "alefsym"));
htmlSymbol.add(new CharacterEntity(8592, "larr"));
htmlSymbol.add(new CharacterEntity(8593, "uarr"));
htmlSymbol.add(new CharacterEntity(8594, "rarr"));
htmlSymbol.add(new CharacterEntity(8595, "darr"));
htmlSymbol.add(new CharacterEntity(8596, "harr"));
htmlSymbol.add(new CharacterEntity(8629, "crarr"));
htmlSymbol.add(new CharacterEntity(8656, "lArr"));
htmlSymbol.add(new CharacterEntity(8657, "uArr"));
htmlSymbol.add(new CharacterEntity(8658, "rArr"));
htmlSymbol.add(new CharacterEntity(8659, "dArr"));
htmlSymbol.add(new CharacterEntity(8660, "hArr"));
htmlSymbol.add(new CharacterEntity(8704, "forall"));
htmlSymbol.add(new CharacterEntity(8706, "part"));
htmlSymbol.add(new CharacterEntity(8707, "exist"));
htmlSymbol.add(new CharacterEntity(8709, "empty"));
htmlSymbol.add(new CharacterEntity(8711, "nabla"));
htmlSymbol.add(new CharacterEntity(8712, "isin"));
htmlSymbol.add(new CharacterEntity(8713, "notin"));
htmlSymbol.add(new CharacterEntity(8715, "ni"));
htmlSymbol.add(new CharacterEntity(8719, "prod"));
htmlSymbol.add(new CharacterEntity(8721, "sum"));
htmlSymbol.add(new CharacterEntity(8722, "minus"));
htmlSymbol.add(new CharacterEntity(8727, "lowast"));
htmlSymbol.add(new CharacterEntity(8730, "radic"));
htmlSymbol.add(new CharacterEntity(8733, "prop"));
htmlSymbol.add(new CharacterEntity(8734, "infin"));
htmlSymbol.add(new CharacterEntity(8736, "ang"));
htmlSymbol.add(new CharacterEntity(8743, "and"));
htmlSymbol.add(new CharacterEntity(8744, "or"));
htmlSymbol.add(new CharacterEntity(8745, "cap"));
htmlSymbol.add(new CharacterEntity(8746, "cup"));
htmlSymbol.add(new CharacterEntity(8747, "int"));
htmlSymbol.add(new CharacterEntity(8756, "there4"));
htmlSymbol.add(new CharacterEntity(8764, "sim"));
htmlSymbol.add(new CharacterEntity(8773, "cong"));
htmlSymbol.add(new CharacterEntity(8776, "asymp"));
htmlSymbol.add(new CharacterEntity(8800, "ne"));
htmlSymbol.add(new CharacterEntity(8801, "equiv"));
htmlSymbol.add(new CharacterEntity(8804, "le"));
htmlSymbol.add(new CharacterEntity(8805, "ge"));
htmlSymbol.add(new CharacterEntity(8834, "sub"));
htmlSymbol.add(new CharacterEntity(8835, "sup"));
htmlSymbol.add(new CharacterEntity(8836, "nsub"));
htmlSymbol.add(new CharacterEntity(8838, "sube"));
htmlSymbol.add(new CharacterEntity(8839, "supe"));
htmlSymbol.add(new CharacterEntity(8853, "oplus"));
htmlSymbol.add(new CharacterEntity(8855, "otimes"));
htmlSymbol.add(new CharacterEntity(8869, "perp"));
htmlSymbol.add(new CharacterEntity(8901, "sdot"));
htmlSymbol.add(new CharacterEntity(8968, "lceil"));
htmlSymbol.add(new CharacterEntity(8969, "rceil"));
htmlSymbol.add(new CharacterEntity(8970, "lfloor"));
htmlSymbol.add(new CharacterEntity(8971, "rfloor"));
htmlSymbol.add(new CharacterEntity(9001, "lang"));
htmlSymbol.add(new CharacterEntity(9002, "rang"));
htmlSymbol.add(new CharacterEntity(9674, "loz"));
htmlSymbol.add(new CharacterEntity(9824, "spades"));
htmlSymbol.add(new CharacterEntity(9827, "clubs"));
htmlSymbol.add(new CharacterEntity(9829, "hearts"));
htmlSymbol.add(new CharacterEntity(9830, "diams"));
htmlSpecial = new ArrayList<CharacterEntity>();
htmlSpecial.add(new CharacterEntity(34, "quot"));
htmlSpecial.add(new CharacterEntity(38, "amp"));
htmlSpecial.add(new CharacterEntity(39, "apos"));
htmlSpecial.add(new CharacterEntity(60, "lt"));
htmlSpecial.add(new CharacterEntity(62, "gt"));
htmlSpecial.add(new CharacterEntity(338, "OElig"));
htmlSpecial.add(new CharacterEntity(339, "oelig"));
htmlSpecial.add(new CharacterEntity(352, "Scaron"));
htmlSpecial.add(new CharacterEntity(353, "scaron"));
htmlSpecial.add(new CharacterEntity(376, "Yuml"));
htmlSpecial.add(new CharacterEntity(710, "circ"));
htmlSpecial.add(new CharacterEntity(732, "tilde"));
htmlSpecial.add(new CharacterEntity(8194, "ensp"));
htmlSpecial.add(new CharacterEntity(8195, "emsp"));
htmlSpecial.add(new CharacterEntity(8201, "thinsp"));
htmlSpecial.add(new CharacterEntity(8204, "zwnj"));
htmlSpecial.add(new CharacterEntity(8205, "zwj"));
htmlSpecial.add(new CharacterEntity(8206, "lrm"));
htmlSpecial.add(new CharacterEntity(8207, "rlm"));
htmlSpecial.add(new CharacterEntity(8211, "ndash"));
htmlSpecial.add(new CharacterEntity(8212, "mdash"));
htmlSpecial.add(new CharacterEntity(8216, "lsquo"));
htmlSpecial.add(new CharacterEntity(8217, "rsquo"));
htmlSpecial.add(new CharacterEntity(8218, "sbquo"));
htmlSpecial.add(new CharacterEntity(8220, "ldquo"));
htmlSpecial.add(new CharacterEntity(8221, "rdquo"));
htmlSpecial.add(new CharacterEntity(8222, "bdquo"));
htmlSpecial.add(new CharacterEntity(8224, "dagger"));
htmlSpecial.add(new CharacterEntity(8225, "Dagger"));
htmlSpecial.add(new CharacterEntity(8226, "bull"));
htmlSpecial.add(new CharacterEntity(8240, "permil"));
htmlSpecial.add(new CharacterEntity(8249, "lsaquo"));
htmlSpecial.add(new CharacterEntity(8250, "rsaquo"));
htmlSpecial.add(new CharacterEntity(8364, "euro"));
List<CharacterEntity> list = new ArrayList<CharacterEntity>();
list.addAll(xml10);
list.addAll(htmlLat1);
list.addAll(htmlSymbol);
list.addAll(htmlSpecial);
html40Entities = new CharacterEntitySolver();
for (CharacterEntity entity : xml10) {
html40Entities.add(entity.getNumericValue(), entity.getName());
}
for (CharacterEntity entity : htmlLat1) {
html40Entities.add(entity.getNumericValue(), entity.getName());
}
for (CharacterEntity entity : htmlSymbol) {
html40Entities.add(entity.getNumericValue(), entity.getName());
}
for (CharacterEntity entity : htmlSpecial) {
html40Entities.add(entity.getNumericValue(), entity.getName());
}
}
/**
* Returns the string with the first character capitalized.
*
*
* @param string
* a string reference to check
* @return the string with the first character capitalized.
*/
public static String firstLower(String string) {
if (!isNullOrEmpty(string)) {
return string.substring(0, 1).toLowerCase() + string.substring(1);
}
return string;
}
/**
* Returns the string with the first character capitalized.
*
*
* @param string
* a string reference to check
* @return the string with the first character capitalized.
*/
public static String firstUpper(String string) {
if (!isNullOrEmpty(string)) {
return string.substring(0, 1).toUpperCase() + string.substring(1);
}
return string;
}
// [ifndef gwt] method
/**
* Encodes the given String into a sequence of bytes using the Ascii
* character set.
*
* @param string
* The string to encode.
* @return The String encoded with the Ascii character set as an array of
* bytes.
*/
public static byte[] getAsciiBytes(String string) {
if (string != null) {
try {
return string.getBytes("US-ASCII");
} catch (Exception e) {
// Should not happen.
return null;
}
}
return null;
}
// [ifndef gwt] method
/**
* Encodes the given String into a sequence of bytes using the Latin1
* character set.
*
* @param string
* The string to encode.
* @return The String encoded with the Latin1 character set as an array of
* bytes.
*/
public static byte[] getLatin1Bytes(String string) {
if (string != null) {
try {
return string.getBytes("ISO-8859-1");
} catch (Exception e) {
// Should not happen.
return null;
}
}
return null;
}
/**
* Returns the given {@link String} according to the HTML 4.0 encoding
* rules.
*
* @param str
* The {@link String} to encode.
* @return The converted {@link String} according to the HTML 4.0 encoding
* rules.
*/
public static String htmlEscape(String str) {
if (str == null) {
return null;
}
int len = str.length();
StringBuilder sb = new StringBuilder((int) (len * 1.5));
for (int i = 0; i < len; i++) {
char c = str.charAt(i);
String entityName = html40Entities.getName(c);
if (entityName == null) {
if (c > 127) {
// Escape non ASCII characters.
sb.append("&#").append(Integer.toString(c, 10)).append(';');
} else {
// ASCII characters are not escaped.
sb.append(c);
}
} else {
sb.append('&').append(entityName).append(';');
}
}
return sb.toString();
}
/**
* Returns the given {@link String} decoded according to the HTML 4.0
* decoding rules.
*
* @param str
* The {@link String} to decode.
* @return The given {@link String} decoded according to the HTML 4.0
* decoding rules.
*/
public static String htmlUnescape(String str) {
if (str == null) {
return null;
}
int len = str.length();
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++) {
char c = str.charAt(i);
if (c == '&') {
int nextIndex = i + 1;
int semicolonIndex = -1;
int ampersandIndex = -1;
boolean stop = false;
for (int j = nextIndex; !stop && j < len; j++) {
char ch = str.charAt(j);
if (';' == ch) {
semicolonIndex = j;
stop = true;
} else if ('&' == ch) {
ampersandIndex = j;
stop = true;
}
}
if (semicolonIndex != -1) {
// Entity found
if (nextIndex != semicolonIndex) {
int entityValue = -1;
String entityName = str.substring(nextIndex,
semicolonIndex);
if (entityName.charAt(0) == '#') {
// Numeric value
if (entityName.length() > 1) {
char hexChar = entityName.charAt(1);
try {
if (hexChar == 'X') {
entityValue = Integer.parseInt(
entityName.substring(2), 16);
} else if (hexChar == 'x') {
entityValue = Integer.parseInt(
entityName.substring(2), 16);
} else {
entityValue = Integer.parseInt(
entityName.substring(1), 10);
}
if (!Character
.isValidCodePoint(entityValue)) {
// Invalid Unicode character
entityValue = -1;
}
} catch (NumberFormatException e) {
entityValue = -1;
}
}
} else {
Integer val = html40Entities.getValue(entityName);
if (val != null) {
entityValue = val.intValue();
}
}
if (entityValue == -1) {
sb.append('&').append(entityName).append(';');
} else {
sb.append((char) entityValue);
}
} else {
sb.append("&;");
}
i = semicolonIndex;
} else if (stop) {
// found a "&" character
sb.append(str, i, ampersandIndex).append('&');
i = ampersandIndex;
} else {
// End of the string reached, no more entities to parse.
sb.append(str, i, len);
i = len;
}
} else {
sb.append(c);
}
}
return sb.toString();
}
/**
* Returns {@code true} if the given string is null or is the empty string.
*
* <p>
* Consider normalizing your string references with {@link #nullToEmpty}. If
* you do, you can use {@link String#isEmpty()} instead of this method, and
* you won't need special null-safe forms of methods like
* {@link String#toUpperCase} either.
*
* @param string
* a string reference to check
* @return {@code true} if the string is null or is the empty string
*/
public static boolean isNullOrEmpty(String string) {
return string == null || string.isEmpty();
}
/**
* Returns the given string if it is non-null; the empty string otherwise.
*
* @param string
* the string to test and possibly return
* @return {@code string} itself if it is non-null; {@code ""} if it is null
*/
public static String nullToEmpty(String string) {
return (string == null) ? "" : string;
}
// [ifndef gwt] method
/**
* Returns an list of trimmed token splitted with the split character ",".
*
* @param stringToSplit
* The String to split.
* @return List of tokens.
*/
public static List<String> splitAndTrim(String stringToSplit) {
return splitAndTrim(stringToSplit, ",");
}
// [ifndef gwt] method
/**
* Returns an list of trimmed token splitted with the split character.
*
* @param stringToSplit
* The String to split.
* @param splitCharacter
* The split Character.
* @return List of tokens.
*/
public static List<String> splitAndTrim(String stringToSplit,
String splitCharacter) {
List<String> list = new ArrayList<>();
// StringTokenizer is 3 times more performant than String#split.
StringTokenizer st = new StringTokenizer(stringToSplit, splitCharacter);
while (st.hasMoreTokens()) {
list.add(st.nextToken().trim());
}
return list;
}
/**
* Strips a delimiter character from both ends of the source string.
*
* @param source
* The source string to strip.
* @param delimiter
* The character to remove.
* @return The stripped string.
*/
public static String strip(String source, char delimiter) {
return strip(source, delimiter, true, true);
}
/**
* Strips a delimiter character from a source string.
*
* @param source
* The source string to strip.
* @param delimiter
* The character to remove.
* @param start
* Indicates if start of source should be stripped.
* @param end
* Indicates if end of source should be stripped.
* @return The stripped source string.
*/
public static String strip(String source, char delimiter, boolean start,
boolean end) {
int beginIndex = 0;
int endIndex = source.length();
boolean stripping = true;
// Strip beginning
while (stripping && (beginIndex < endIndex)) {
if (source.charAt(beginIndex) == delimiter) {
beginIndex++;
} else {
stripping = false;
}
}
// Strip end
stripping = true;
while (stripping && (beginIndex < endIndex - 1)) {
if (source.charAt(endIndex - 1) == delimiter) {
endIndex--;
} else {
stripping = false;
}
}
return source.substring(beginIndex, endIndex);
}
/**
* Private constructor to ensure that the class acts as a true utility class
* i.e. it isn't instantiable and extensible.
*/
private StringUtils() {
}
}