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/*
* Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.util.locale.provider;
import java.text.spi.BreakIteratorProvider;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;
import java.util.stream.Stream;
/*
* FallbackProviderAdapter implementation. Fallback provider serves the
* following purposes:
*
* - Locale data for ROOT, in case CLDR provider is absent.
* - Locale data for BreakIterator/Collator resources for all locales.
* - "Gan-nen" support for SimpleDateFormat (provides "FirstYear" for
* Japanese locales).
*/
public class FallbackLocaleProviderAdapter extends JRELocaleProviderAdapter {
// Required locales/langtags
private static final Locale[] AVAILABLE_LOCS = {Locale.US, Locale.ENGLISH, Locale.ROOT};
private static final Set<String> AVAILABLE_LANGTAGS = Set.of("en-US", "en", "und");
private volatile BreakIteratorProvider breakIteratorProvider;
/**
* Returns the type of this LocaleProviderAdapter
*/
@Override
public LocaleProviderAdapter.Type getAdapterType() {
return Type.FALLBACK;
}
@Override
public Locale[] getAvailableLocales() {
return Stream.concat(Arrays.stream(super.getAvailableLocales()), Stream.of(AVAILABLE_LOCS))
.distinct().toArray(Locale[]::new);
}
@Override
protected Set<String> createLanguageTagSet(String category) {
var s = new HashSet<>(super.createLanguageTagSet(category));
s.addAll(AVAILABLE_LANGTAGS);
return s;
}
@Override
public boolean isSupportedProviderLocale(Locale locale, Set<String> langtags) {
if (Locale.ROOT.equals(locale)) {
return true;
}
locale = locale.stripExtensions();
return langtags.contains(locale.toLanguageTag());
}
@Override
// In order to correctly report supported locales
public BreakIteratorProvider getBreakIteratorProvider() {
if (breakIteratorProvider == null) {
BreakIteratorProvider provider = new BreakIteratorProviderImpl(
getAdapterType(),
getLanguageTagSet("BreakIteratorRules"));
synchronized (this) {
if (breakIteratorProvider == null) {
breakIteratorProvider = provider;
}
}
}
return breakIteratorProvider;
}
}
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