org.meeuw.i18n.languages.ISO_639 Maven / Gradle / Ivy
package org.meeuw.i18n.languages;
import java.util.*;
import java.util.logging.Level;
import java.util.stream.Stream;
import javax.validation.constraints.Size;
import com.fasterxml.jackson.annotation.JsonCreator;
import static org.meeuw.i18n.languages.ISO_639_3_Code.KNOWN;
/**
* A utility class for working with ISO 639 language codes.
*
* @since 3.1
*/
public class ISO_639 {
private ISO_639() {
}
/**
* Retrieves a {@link ISO_639_3_Code} by its Part1 code {@link ISO_639_3_Code#part1()}
*
* @param code A 2 letter language code
* @return An optional containing the {@link ISO_639_3_Code} if found.
*/
public static Optional getByPart1(String code) {
return ISO_639_3_Code
.getByPart1(code)
.map(LanguageCode::updateToEnum);
}
/**
* Retrieves a {@link LanguageCode} by its Part2B ('bibliographic') code {@link ISO_639_3_Code#part2B()}
*
* @param code A 2 or 3 letter language code
* @return An optional containing the {@link ISO_639_3_Code} if found.
*/
public static Optional getByPart2B(String code) {
if (code == null) {
return Optional.empty();
}
final String lowerCode = code.toLowerCase();
return ISO_639_3_Code.stream()
.filter(i -> lowerCode.equals(i.part2B()))
.map(LanguageCode::updateToEnum)
.findFirst();
}
/**
* Retrieves a {@link ISO_639_3_Code} by its Part2T ('terminology') code {@link ISO_639_3_Code#part2T()}
*
* @param code A 2 or 3 letter language code
* @return An optional containing the {@link ISO_639_3_Code} if found.
*/
public static Optional getByPart2T(String code) {
if (code == null) {
return Optional.empty();
}
final String lowerCode = code.toLowerCase();
return KNOWN.values().stream()
.filter(i -> lowerCode.equals(i.part2T()))
.map(LanguageCode::updateToEnum)
.findFirst();
}
/**
* Retrieves a {@link ISO_639_3_Code} by its three-letter identifier {@link #getByPart3(String, boolean)} ()}
*
* If the given code is a {@link RetiredLanguageCode retired code}, the replacement code is returned if possible. If a retired code is matched, but no single replacement is found, an empty optional is returned, and a warning is logged (using {@link java.util.logging JUL})
*
* @param code A 2 or 3 letter language code
* @return An optional containing the {@link ISO_639_3_Code} if found.
* @since 2.2
*/
public static Optional getByPart3(@Size(min = 3, max = 3) String code, boolean matchRetired) {
return ISO_639_3_Code.getByPart3(code, matchRetired, Level.WARNING)
.map(LanguageCode::updateToEnum)
;
}
/**
* Defaulting version of {@link #getByPart3(String, boolean)}, matching retired codes too.
*/
public static Optional getByPart3(@Size(min = 3, max = 3) String code) {
return getByPart3(code, true);
}
/**
* Retrieves a language family code by its 3 letter code.
*
* @see LanguageFamilyCode#get(String)
*/
public static Optional getByPart5(@Size(min = 3, max = 3) String code) {
return LanguageFamilyCode.get(code);
}
/**
* A stream with all known {@link ISO_639_Code language (or language family) codes} .
*
*
* @return a stream of all known language codes.
*/
public static Stream stream() {
return Stream.concat(
LanguageCode.stream(),
Arrays.stream(LanguageFamilyCode.values())
);
}
public static Stream> streamByNames() {
return Stream.concat(
LanguageCode.streamByNames(),
Arrays.stream(LanguageFamilyCode.values())
.map(l -> new AbstractMap.SimpleEntry<>(l.refName(), l))
);
}
private static final ThreadLocal> FALLBACKS = ThreadLocal.withInitial(HashMap::new);
/**
* Registers a certain code as a fallback language or language group code. This is only valid for the current thread, until {@link #resetFallBacks()} is called.
*
* The effect is that {@link #get(String)} will return the registered {@link ISO_639_3_Code fallback code} if no real code is found.
*
* If the given argument is an instance of {@link LanguageCode} it will also be registered as {@link LanguageCode#registerFallback(String, LanguageCode)}
*
* @see #setFallbacks(Map) To replace all current fallbacks with a map of these.
* @see LanguageCode#registerFallback(String, LanguageCode)
* @since 3.2
*/
public static void registerFallback(String code, ISO_639_Code exemption) {
FALLBACKS.get().put(code, exemption);
}
/**
* Replaces all current fallbacks with a map of these. Note that this will not replace the fallbacks in {@link LanguageCode#getFallBacks()}.
*
* @see #registerFallback(String, ISO_639_Code)
* @since 3.2
*/
static void setFallbacks(Map exemptions) {
FALLBACKS.set(exemptions);
}
/**
* Returns the currently registered fallbacks (as an unmodifiable map).
* @since 3.2
* @see #registerFallback
* @see #setFallbacks(Map)
* @see LanguageCode#getFallBacks()
*/
public static Map getFallBacks() {
return Collections.unmodifiableMap(FALLBACKS.get());
}
/**
* Resets the current fallbacks for the current thread. After this, no fallbacks will be effective anymore.
* @since 3.2
*/
public static void resetFallBacks() {
FALLBACKS.remove();
}
/**
* Obtains a language or language family by (one of their) code(s).
*
* @see #get For a version that throws an exception if not found.
*/
public static Optional get(String code) {
ISO_639_Code lc = LanguageCode.get(code).orElse(null);
if (lc == null) {
try {
return Optional.of(LanguageFamilyCode.valueOf(code));
} catch (IllegalArgumentException iae) {
ISO_639_Code o = FALLBACKS.get().get(code);
return Optional.ofNullable(o);
}
} else {
return Optional.of(lc);
}
}
/**
* As {@link #get(String)}, but throws an {@link IllegalArgumentException} if not found.
*
* @return The {@link ISO_639_3_Code} if found
* @throws IllegalArgumentException if not found
*/
@JsonCreator
public static ISO_639_Code iso639(String code) {
return get(code)
.orElseThrow(() -> new IllegalArgumentException("Unknown language code " + code));
}
}