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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.language;
import java.util.Locale;
/**
* @author Simon Thoresen
*/
public final class LocaleFactory {
private static final Locale UNKNOWN = new Locale("", "", "");
private LocaleFactory() {
// hide
}
/**
* Implements a simple parser for RFC5646 language tags. The language tag is parsed into a Locale.
*
* @param tag The language tag to parse.
* @return The corrseponding Locale.
*/
@SuppressWarnings("ConstantConditions")
public static Locale fromLanguageTag(String tag) {
// TODO: Should be replaced by return Locale.forLanguageTag(tag); ?
tag.getClass(); // throws NullPointerException
tag = tag.trim();
if (tag.isEmpty()) {
return UNKNOWN;
}
String language = "";
String region = "";
String script = "";
String[] parts = tag.split("-");
for (int partIdx = 0; partIdx < parts.length; ++partIdx) {
String part = parts[partIdx];
int partLen = part.length();
if (partIdx == 0) {
if (partLen == 2 || partLen == 3) {
language = part;
}
} else if (partIdx == 1 || partIdx == 2) {
if (partLen == 2 || partLen == 3) {
region = part;
} else if (partLen == 4) {
script = part;
}
}
}
if (language.isEmpty()) {
return UNKNOWN;
}
return new Locale(language, region, script);
}
}
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