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 * Copyright 2017 Red Hat, Inc.
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 *  http://www.apache.org/licenses/LICENSE-2.0
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package org.jboss.logging;

import java.util.Locale;

A simple utility to resolve the default locale to use for internationalized loggers and message bundles.
Author:James R. Perkins
/** * A simple utility to resolve the default locale to use for internationalized loggers and message bundles. * * @author <a href="mailto:jperkins@redhat.com">James R. Perkins</a> */
@SuppressWarnings("SameParameterValue") class LoggingLocale { private static final Locale LOCALE = getDefaultLocale();
Attempts to create a Locale based on the org.jboss.logging.locale system property. If the value is not defined the default locale will be used.

The value should be in the BCP 47 format.

Note: Currently this uses a custom parser to attempt to parse the BCP 47 format. This will be changed to use the Locale.forLanguageTag() once a move to JDK 7. Currently only the language, region and variant are used to construct the locale.

Returns:the locale created or the default locale
/** * Attempts to create a {@link Locale} based on the {@code org.jboss.logging.locale} system property. If the value * is not defined the {@linkplain Locale#getDefault() default locale} will be used. * <p> * The value should be in the <a href="https://tools.ietf.org/html/bcp47">BCP 47</a> format. * </p> * <p> * <strong>Note:</strong> Currently this uses a custom parser to attempt to parse the BCP 47 format. This will be * changed to use the {@code Locale.forLanguageTag()} once a move to JDK 7. Currently only the language, region and * variant are used to construct the locale. * </p> * * @return the locale created or the default locale */
static Locale getLocale() { return LOCALE; } private static Locale getDefaultLocale() { final String bcp47Tag = SecurityActions.getSystemProperty("org.jboss.logging.locale", ""); if (bcp47Tag.trim().isEmpty()) { return Locale.getDefault(); } // When we upgrade to Java 7 we can use the Locale.forLanguageTag(locale) which will reliably parse the // the value. For now we have to attempt to parse it the best we can. return forLanguageTag(bcp47Tag); } private static Locale forLanguageTag(final String locale) { // First check known locales if ("en-CA".equalsIgnoreCase(locale)) { return Locale.CANADA; } else if ("fr-CA".equalsIgnoreCase(locale)) { return Locale.CANADA_FRENCH; } else if ("zh".equalsIgnoreCase(locale)) { return Locale.CHINESE; } else if ("en".equalsIgnoreCase(locale)) { return Locale.ENGLISH; } else if ("fr-FR".equalsIgnoreCase(locale)) { return Locale.FRANCE; } else if ("fr".equalsIgnoreCase(locale)) { return Locale.FRENCH; } else if ("de".equalsIgnoreCase(locale)) { return Locale.GERMAN; } else if ("de-DE".equalsIgnoreCase(locale)) { return Locale.GERMANY; } else if ("it".equalsIgnoreCase(locale)) { return Locale.ITALIAN; } else if ("it-IT".equalsIgnoreCase(locale)) { return Locale.ITALY; } else if ("ja-JP".equalsIgnoreCase(locale)) { return Locale.JAPAN; } else if ("ja".equalsIgnoreCase(locale)) { return Locale.JAPANESE; } else if ("ko-KR".equalsIgnoreCase(locale)) { return Locale.KOREA; } else if ("ko".equalsIgnoreCase(locale)) { return Locale.KOREAN; } else if ("zh-CN".equalsIgnoreCase(locale)) { return Locale.SIMPLIFIED_CHINESE; } else if ("zh-TW".equalsIgnoreCase(locale)) { return Locale.TRADITIONAL_CHINESE; } else if ("en-UK".equalsIgnoreCase(locale)) { return Locale.UK; } else if ("en-US".equalsIgnoreCase(locale)) { return Locale.US; } // Split the string into parts and attempt final String[] parts = locale.split("-"); final int len = parts.length; int index = 0; int count = 0; final String language = parts[index++]; String region = ""; // country String variant = ""; // The next 3 sections may be extended languages, we're just going to ignore them while (index < len) { if (count++ == 2 || !isAlpha(parts[index], 3, 3)) { break; } index++; } // Check for a script, we'll skip it however a script is not supported until Java 7 if (index != len && isAlpha(parts[index], 4, 4)) { index++; } // Next should be the region, 3 digit is allowed but may not work with Java 6 if (index != len && (isAlpha(parts[index], 2, 2) || isNumeric(parts[index], 3, 3))) { region = parts[index++]; } // Next should be the variant and we will just use the first one found, all other parts will be ignored if (index != len && (isAlphaOrNumeric(parts[index], 5, 8))) { variant = parts[index]; } return new Locale(language, region, variant); } private static boolean isAlpha(final String value, final int minLen, final int maxLen) { final int len = value.length(); if (len < minLen || len > maxLen) { return false; } for (int i = 0; i < len; i++) { if (!Character.isLetter(value.charAt(i))) { return false; } } return true; } private static boolean isNumeric(final String value, final int minLen, final int maxLen) { final int len = value.length(); if (len < minLen || len > maxLen) { return false; } for (int i = 0; i < len; i++) { if (!Character.isDigit(value.charAt(i))) { return false; } } return true; } private static boolean isAlphaOrNumeric(final String value, final int minLen, final int maxLen) { final int len = value.length(); if (len < minLen || len > maxLen) { return false; } for (int i = 0; i < len; i++) { if (!Character.isLetterOrDigit(value.charAt(i))) { return false; } } return true; } }