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+/* LocaleHelper.java -- helper routines for localization
+   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.locale;
+
+import java.text.Collator;
+import java.util.Locale;
+
+/**
+ * This class provides common helper methods
+ * for handling localized data.
+ *
+ * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
+ *
+ * @see java.util.Locale
+ * @see java.util.ResourceBundle
+ */
+public class LocaleHelper
+{
+  /**
+   * <p>
+   * This method is used by the localized name lookup methods to
+   * retrieve the next locale to try.  The next locale is derived
+   * from the supplied locale by applying the first applicable
+   * rule from the following:
+   * </p>
+   * <ol>
+   * <li>If the variant contains a <code>'_'</code>, then
+   * this and everything following it is trimmed.</li>
+   * <li>If the variant is non-empty, it is converted to
+   * an empty string.</li>
+   * <li>If the country is non-empty, it is converted to
+   * an empty string.</li>
+   * <li>If the language is non-empty, it is converted to
+   * an empty string (forming {@link java.util.Locale#ROOT})</li>
+   * </ol>
+   * <p>
+   * The base fallback locale is {@link java.util.Locale#ROOT}.
+   * </p>
+   *
+   * @param locale the locale for which a localized piece of
+   *               data could not be obtained.
+   * @return the next fallback locale to try.
+   */
+  public static Locale getFallbackLocale(Locale locale)
+  {
+    String language = locale.getLanguage();
+    String country = locale.getCountry();
+    String variant = locale.getVariant();
+    int uscore = variant.indexOf('_');
+    if (uscore != -1)
+      return new Locale(language, country,
+                        variant.substring(0, uscore));
+    if (!variant.isEmpty())
+      return new Locale(language, country, "");
+    if (!country.isEmpty())
+      return new Locale(language, "", "");
+    return Locale.ROOT;
+  }
+
+  /**
+   * Return an array of all the locales for which there is a
+   * {@link Collator} instance.  A new array is returned each time.
+   */
+  public static Locale[] getCollatorLocales()
+  {
+    // For now we don't bother caching.  This is probably
+    // not called very frequently.  And, we would have to
+    // clone the array anyway.
+    if (LocaleData.collatorLocaleNames.length == 0)
+      return new Locale[] { Locale.US };
+    Locale[] result = new Locale[LocaleData.collatorLocaleNames.length];
+    for (int i = 0; i < result.length; ++i)
+      {
+        String language;
+        String region = "";
+        String variant = "";
+        String name = LocaleData.collatorLocaleNames[i];
+
+        language = name.substring(0, 2);
+
+        if (name.length() > 2)
+          region = name.substring(3);
+
+        int index = region.indexOf("_");
+        if (index > 0)
+          {
+            variant = region.substring(index + 1);
+            region = region.substring(0, index - 1);
+          }
+
+        result[i] = new Locale(language, region, variant);
+      }
+    return result;
+  }
+
+  /**
+   * Return the number of locales we know of.
+   */
+  public static int getLocaleCount()
+  {
+    return LocaleData.localeNames.length;
+  }
+
+  /**
+   * Return the Nth locale name.
+   */
+  public static String getLocaleName(int n)
+  {
+    return LocaleData.localeNames[n];
+  }
+}