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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.language;
import java.util.Locale;
import java.util.Objects;
/**
* @author Simon Thoresen Hult
*/
public final class LocaleFactory {
private static final Locale UNKNOWN = new Locale("", "", "");
private LocaleFactory() {}
/**
* 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 corresponding Locale
*/
public static Locale fromLanguageTag(String tag) {
Objects.requireNonNull(tag, "tag cannot be null");
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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