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/*
 * Copyright 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.i18n.shared;

import java.util.List;

/**
 * Class representing GWT locales and conversion to/from other formats.
 *
 * These locales correspond to BCP47.
 */
public interface GwtLocale extends Comparable {

  String DEFAULT_LOCALE = "default";

  /**
   * The default comparison is a lexical ordering.
   */
  int compareTo(GwtLocale o);

  /**
   * Returns the list of aliases for this locale.  The canonical form of the
   * current locale is always first on the list.
   *
   * Language/region codes have changed over time, so some systems continue to
   * use the older codes.  Aliases allow GWT to use the official Unicode CLDR
   * locales while still interoperating with such systems.
   *
   * @return alias list
   */
  List getAliases();

  /**
   * Returns the locale as a fixed-format string suitable for use in searching
   * for localized resources.  The format is language_Script_REGION_VARIANT,
   * where language is a 2-8 letter code (possibly with 3-letter extensions),
   * script is a 4-letter code with an initial capital letter, region is a
   * 2-character country code or a 3-digit region code, and variant is a 5-8
   * character (may be 4 if the first character is numeric) code.  If a
   * component is missing, its preceding _ is also omitted.  If this is the
   * default locale, the empty string will be returned.
   *
   * @return String representing locale
   */
  String getAsString();

  /**
   * Returns this locale in canonical form.
   * 
    *
  • Deprecated language/region tags are replaced with official versions *
  • Default scripts are removed (including region-specific defaults for * Chinese) *
  • no/nb/nn are normalized *
  • Default region for zh_Hans and zh_Hant if none specified *
* * @return GwtLocale instance */ GwtLocale getCanonicalForm(); /** * Returns the complete list of locales to search for the current locale. * This list will always start with the canonical form of this locale, and * end with "default", and include all appropriate aliases along the way. * * @return search list */ List getCompleteSearchList(); /** * Returns a list of locales to search for, in order of preference. The * current locale is always first on the list. Aliases are not included * in the list -- use {@link #getAliases} to expand those. * * @return inheritance list */ List getInheritanceChain(); /** * Returns the language portion of the locale, or null if none. */ String getLanguage(); /** * Returns the language portion of the locale, or the empty string if none. */ String getLanguageNotNull(); /** * Returns the region portion of the locale, or null if none. */ String getRegion(); /** * Returns the region portion of the locale, or the empty string if none. */ String getRegionNotNull(); /** * Returns the script portion of the locale, or null if none. */ String getScript(); /** * Returns the script portion of the locale, or the empty string if none. */ String getScriptNotNull(); /** * Returns the variant portion of the locale, or null if none. */ String getVariant(); /** * Returns the variant portion of the locale, or the empty string if none. */ String getVariantNotNull(); /** * Returns true if this locale inherits from the specified locale. Note that * locale.inheritsFrom(locale) is false -- if you want that to be true, you * should just use locale.getInheritanceChain().contains(x). * * @param parent locale to test against * @return true if parent is an ancestor of this locale */ boolean inheritsFrom(GwtLocale parent); /** * Returns true if this is the default or root locale. */ boolean isDefault(); /** * Returns a human readable string -- "default" or the same as getAsString(). */ String toString(); /** * Checks if this locale uses the same script as another locale. * * @param other * @return true if the scripts are the same */ boolean usesSameScript(GwtLocale other); }




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