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International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/*
*******************************************************************************
* Copyright (C) 2009-2010, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
package com.ibm.icu.impl.locale;
import com.ibm.icu.impl.Utility;
public final class AsciiUtil {
public static boolean caseIgnoreMatch(String s1, String s2) {
if (Utility.sameObjects(s1, s2)) {
return true;
}
int len = s1.length();
if (len != s2.length()) {
return false;
}
int i = 0;
while (i < len) {
char c1 = s1.charAt(i);
char c2 = s2.charAt(i);
if (c1 != c2 && toLower(c1) != toLower(c2)) {
break;
}
i++;
}
return (i == len);
}
public static int caseIgnoreCompare(String s1, String s2) {
if (Utility.sameObjects(s1, s2)) {
return 0;
}
return AsciiUtil.toLowerString(s1).compareTo(AsciiUtil.toLowerString(s2));
}
public static char toUpper(char c) {
if (c >= 'a' && c <= 'z') {
c -= 0x20;
}
return c;
}
public static char toLower(char c) {
if (c >= 'A' && c <= 'Z') {
c += 0x20;
}
return c;
}
public static String toLowerString(String s) {
int idx = 0;
for (; idx < s.length(); idx++) {
char c = s.charAt(idx);
if (c >= 'A' && c <= 'Z') {
break;
}
}
if (idx == s.length()) {
return s;
}
StringBuilder buf = new StringBuilder(s.substring(0, idx));
for (; idx < s.length(); idx++) {
buf.append(toLower(s.charAt(idx)));
}
return buf.toString();
}
public static String toUpperString(String s) {
int idx = 0;
for (; idx < s.length(); idx++) {
char c = s.charAt(idx);
if (c >= 'a' && c <= 'z') {
break;
}
}
if (idx == s.length()) {
return s;
}
StringBuilder buf = new StringBuilder(s.substring(0, idx));
for (; idx < s.length(); idx++) {
buf.append(toUpper(s.charAt(idx)));
}
return buf.toString();
}
public static String toTitleString(String s) {
if (s.length() == 0) {
return s;
}
int idx = 0;
char c = s.charAt(idx);
if (!(c >= 'a' && c <= 'z')) {
for (idx = 1; idx < s.length(); idx++) {
if (c >= 'A' && c <= 'Z') {
break;
}
}
}
if (idx == s.length()) {
return s;
}
StringBuilder buf = new StringBuilder(s.substring(0, idx));
if (idx == 0) {
buf.append(toUpper(s.charAt(idx)));
idx++;
}
for (; idx < s.length(); idx++) {
buf.append(toLower(s.charAt(idx)));
}
return buf.toString();
}
public static boolean isAlpha(char c) {
return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}
public static boolean isAlphaString(String s) {
boolean b = true;
for (int i = 0; i < s.length(); i++) {
if (!isAlpha(s.charAt(i))) {
b = false;
break;
}
}
return b;
}
public static boolean isNumeric(char c) {
return (c >= '0' && c <= '9');
}
public static boolean isNumericString(String s) {
boolean b = true;
for (int i = 0; i < s.length(); i++) {
if (!isNumeric(s.charAt(i))) {
b = false;
break;
}
}
return b;
}
public static boolean isAlphaNumeric(char c) {
return isAlpha(c) || isNumeric(c);
}
public static boolean isAlphaNumericString(String s) {
boolean b = true;
for (int i = 0; i < s.length(); i++) {
if (!isAlphaNumeric(s.charAt(i))) {
b = false;
break;
}
}
return b;
}
public static class CaseInsensitiveKey {
private String _key;
private int _hash;
public CaseInsensitiveKey(String key) {
_key = key;
_hash = AsciiUtil.toLowerString(key).hashCode();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o instanceof CaseInsensitiveKey) {
return AsciiUtil.caseIgnoreMatch(_key, ((CaseInsensitiveKey)o)._key);
}
return false;
}
@Override
public int hashCode() {
return _hash;
}
}
}