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RePlay is a fork of the Play1 framework, created by Codeborne.
package play.i18n;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import play.Play;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.*;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* I18n Helper
*
* translation are defined as properties in /conf/messages.locale files with locale being the i18n country code
* fr, en, fr_FR
*
*
* # /conf/messages.fr
* hello=Bonjour, %s !
*
*
* {@code
* Messages.get( "hello", "World"); // => "Bonjour, World !"
* }
*
*/
public class Messages {
private static final Logger logger = LoggerFactory.getLogger(Messages.class);
private static final Object[] NO_ARGS = new Object[] { null };
public static Properties defaults = new Properties();
public static Map locales = new HashMap<>();
private static final Pattern recursive = Pattern.compile("&\\{(.*?)}");
/**
* Given a message code, translate it using current locale. If there is no message in the current locale for the
* given key, the key is returned.
*
* @param key
* the message code
* @param args
* optional message format arguments
* @return translated message
*/
public static String get(Object key, Object... args) {
return getMessage(Lang.get(), key, args);
}
/**
* Return several messages for a locale
*
* @param locale
* the locale code, e.g. fr, fr_FR
* @param keys
* the keys to get messages from. Wildcards can be used at the end: {'title', 'login.*'}
* @return messages as a {@link Properties java.util.Properties}
*/
public static Properties find(String locale, Set keys) {
Properties result = new Properties();
Properties all = all(locale);
// Expand the set for wildcards
Set wildcards = new HashSet<>();
for (String key : keys) {
if (key.endsWith("*"))
wildcards.add(key);
}
for (String key : wildcards) {
keys.remove(key);
String start = key.substring(0, key.length() - 1);
for (Object key2 : all.keySet()) {
if (((String) key2).startsWith(start)) {
keys.add((String) key2);
}
}
}
// Build the result
for (Object key : all.keySet()) {
if (keys.contains(key)) {
result.put(key, all.get(key));
}
}
return result;
}
public static String getMessage(String locale, Object key, Object... args) {
return getMessage(locale, (k) -> k.toString(), key, args);
}
public static String getMessage(@Nonnull String locale, @Nonnull Function defaultMessage, @Nullable Object key, Object... args) {
// Check if there is a plugin that handles translation
Optional message = Play.pluginCollection.getMessage(locale, key, args);
if (message.isPresent()) {
return message.get();
}
if (key == null || "".equals(key)) {
return "";
}
String value = null;
if (locales != null) {
if (locales.containsKey(locale)) {
value = locales.get(locale).getProperty(key.toString());
}
if (value == null && locale != null && locale.length() == 5 && locales.containsKey(locale.substring(0, 2))) {
value = locales.get(locale.substring(0, 2)).getProperty(key.toString());
}
}
if (value == null && defaults != null) {
value = defaults.getProperty(key.toString());
}
if (value == null) {
value = defaultMessage.apply(key);
}
if (value == null) {
return "";
}
Locale l = Lang.getLocaleOrDefault(locale);
return formatString(l, value, args);
}
public static String formatString(String value, Object... args) {
return formatString(Lang.getLocale(), value, args);
}
public static String formatString(Locale locale, String value, Object... args) {
String message = String.format(locale, value, coolStuff(value, args));
Matcher matcher = recursive.matcher(message);
StringBuilder sb = new StringBuilder();
while (matcher.find()) {
matcher.appendReplacement(sb, get(matcher.group(1)));
}
matcher.appendTail(sb);
return sb.toString();
}
private static final Pattern formatterPattern = Pattern.compile("%((\\d+)\\$)?([-#+ 0,(]+)?(\\d+)?([.]\\d+)?([bBhHsScCdoxXeEfgGaAtT])");
@SuppressWarnings("unchecked")
private static Object[] coolStuff(String pattern, Object[] args) {
// when invoked with a null argument we get a null args instead of an
// array with a null value.
if (args == null || args.length == 0)
return NO_ARGS;
Class[] conversions = new Class[args.length];
Matcher matcher = formatterPattern.matcher(pattern);
int incrementalPosition = 1;
while (matcher.find()) {
String conversion = matcher.group(6);
Integer position;
if (matcher.group(2) == null) {
position = incrementalPosition++;
} else {
position = Integer.parseInt(matcher.group(2));
}
if (conversion.equals("d") && position <= conversions.length) {
conversions[position - 1] = Long.class;
}
if (conversion.equals("f") && position <= conversions.length) {
conversions[position - 1] = Double.class;
}
}
Object[] result = new Object[args.length];
for (int i = 0; i < args.length; i++) {
if (args[i] == null) {
continue;
}
if (conversions[i] == null) {
result[i] = args[i];
} else {
try {
String argValue = String.valueOf(args[i]);
if (Double.class.isAssignableFrom(conversions[i])) {
result[i] = Double.parseDouble(argValue);
}
else if (Long.class.isAssignableFrom(conversions[i])) {
result[i] = Long.parseLong(argValue.contains(".") ? argValue.substring(0, argValue.indexOf('.')) : argValue);
}
else {
throw new IllegalStateException("Cannot parse argument #" + i + "=" + argValue + ": unknown conversion type " + conversions[i]);
}
} catch (IllegalStateException e) {
throw e;
} catch (NumberFormatException ignore) {
result[i] = null;
} catch (RuntimeException e) {
logger.error("Invalid value: {}", args[i], e);
result[i] = null;
}
}
}
return result;
}
/**
* return all messages for a locale
*
* @param locale
* the locale code eg. fr, fr_FR
* @return messages as a {@link Properties java.util.Properties}
*/
public static Properties all(String locale) {
if (locale == null || "".equals(locale)) {
return defaults;
}
Properties mergedMessages = new Properties();
mergedMessages.putAll(defaults);
if (locales != null) {
if (locale.length() == 5 && locales.containsKey(locale.substring(0, 2))) {
mergedMessages.putAll(locales.get(locale.substring(0, 2)));
}
mergedMessages.putAll(locales.get(locale));
}
return mergedMessages;
}
}