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Extract some helper methods to make the code better readable

This commit is contained in:
Benedikt Ritter 2017-04-17 12:29:05 +02:00
parent d547412bbd
commit d3146a5456
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1 changed files with 47 additions and 13 deletions
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60
src/main/java/org/apache/commons/lang3/LocaleUtils.java
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@ -123,35 +123,39 @@ public static Locale toLocale(final String str) {
return new Locale(StringUtils.EMPTY, str.substring(1, 3), str.substring(4)); return new Locale(StringUtils.EMPTY, str.substring(1, 3), str.substring(4));
} }
return parseLocale(str, len); return parseLocale(str);
} }
private static Locale parseLocale(final String str, final int len) { /**
* Tries to parse a locale from the given String.
*
* @param str the String to parse a locale from.
* @return a Locale instance parsed from the given String.
* @throws IllegalArgumentException if the given String can not be parsed.
*/
private static Locale parseLocale(final String str) {
final String[] segments = str.split("_", -1); final String[] segments = str.split("_", -1);
final int segmentCount = segments.length -1; final int segmentCount = segments.length -1;
final String country = segments[0]; final String language = segments[0];
switch (segmentCount) { switch (segmentCount) {
case 0: case 0:
if (StringUtils.isAllLowerCase(str) && (len == 2 || len == 3)) { if (isISO639LanguageCode(str)) {
return new Locale(str); return new Locale(str);
} }
throw new IllegalArgumentException("Invalid locale format: " + str); throw new IllegalArgumentException("Invalid locale format: " + str);
case 1: case 1:
if (StringUtils.isAllLowerCase(country) && if (isISO639LanguageCode(language) && isISO3166CountryCode(segments[1]) ||
(country.length() == 2 || country.length() == 3) && isNumericAreaCode(segments[1])) {
(segments[1].length() == 2 && StringUtils.isAllUpperCase(segments[1])) || return new Locale(language, segments[1]);
(segments[1].length() == 3 && StringUtils.isNumeric(segments[1]))) {
return new Locale(country, segments[1]);
} }
throw new IllegalArgumentException("Invalid locale format: " + str); throw new IllegalArgumentException("Invalid locale format: " + str);
case 2: case 2:
if (StringUtils.isAllLowerCase(country) && if (isISO639LanguageCode(language) &&
(country.length() == 2 || country.length() == 3) && (segments[1].length() == 0 || isISO3166CountryCode(segments[1])) &&
(segments[1].length() == 0 || segments[1].length() == 2 && StringUtils.isAllUpperCase(segments[1])) &&
segments[2].length() > 0) { segments[2].length() > 0) {
return new Locale(country, segments[1], segments[2]); return new Locale(language, segments[1], segments[2]);
} }
//$FALL-THROUGH$ //$FALL-THROUGH$
@ -160,6 +164,36 @@ private static Locale parseLocale(final String str, final int len) {
} }
} }
/**
* Checks whether the given String is a ISO 639 compliant language code.
*
* @param str the String to check.
* @return true, if the given String is a ISO 639 compliant language code.
*/
private static boolean isISO639LanguageCode(final String str) {
return StringUtils.isAllLowerCase(str) && (str.length() == 2 || str.length() == 3);
}
/**
* Checks whether the given String is a ISO 3166 alpha-2 country code.
*
* @param str the String to check
* @return true, is the given String is a ISO 3166 compliant country code.
*/
private static boolean isISO3166CountryCode(final String str) {
return StringUtils.isAllUpperCase(str) && str.length() == 2;
}
/**
* Checks whether the given String is a UN M.49 numeric area code.
*
* @param str the String to check
* @return true, is the given String is a UN M.49 numeric area code.
*/
private static boolean isNumericAreaCode(final String str) {
return StringUtils.isNumeric(str) && str.length() == 3;
}
//----------------------------------------------------------------------- //-----------------------------------------------------------------------
/** /**
* <p>Obtains the list of locales to search through when performing * <p>Obtains the list of locales to search through when performing