use language tags everywhere for Locales

lucene/analysis/common/src/java/org/apache/lucene/analysis/br/BrazilianStemmer.java

@@ -20,7 +20,7 @@ import java.util.Locale;
 
 /** A stemmer for Brazilian Portuguese words. */
 class BrazilianStemmer {
-  private static final Locale locale = Locale.of("pt", "BR");
+  private static final Locale locale = Locale.forLanguageTag("pt-BR");
 
   /** Changed term */
   private String TERM;

lucene/analysis/common/src/java/org/apache/lucene/analysis/de/GermanStemmer.java

@@ -33,7 +33,7 @@ class GermanStemmer {
   /** Amount of characters that are removed with <code>substitute()</code> while stemming. */
   private int substCount = 0;
 
-  private static final Locale locale = Locale.of("de", "DE");
+  private static final Locale locale = Locale.forLanguageTag("de-DE");
 
   /**
    * Stemms the given term to an unique <code>discriminator</code>.

lucene/analysis/common/src/java/org/apache/lucene/analysis/th/ThaiTokenizer.java

@@ -38,7 +38,8 @@ public class ThaiTokenizer extends SegmentingTokenizerBase {
    */
   public static final boolean DBBI_AVAILABLE;
 
-  private static final BreakIterator proto = BreakIterator.getWordInstance(Locale.of("th"));
+  private static final BreakIterator proto =
+      BreakIterator.getWordInstance(Locale.forLanguageTag("th"));
 
   static {
     // check that we have a working dictionary-based break iterator for thai

lucene/analysis/common/src/test/org/apache/lucene/collation/TestCollationKeyAnalyzer.java

@@ -26,7 +26,7 @@ public class TestCollationKeyAnalyzer extends CollationTestBase {
   // Neither Java 1.4.2 nor 1.5.0 has Farsi Locale collation available in
   // RuleBasedCollator.  However, the Arabic Locale seems to order the Farsi
   // characters properly.
-  private Collator collator = Collator.getInstance(Locale.of("ar"));
+  private Collator collator = Collator.getInstance(Locale.forLanguageTag("ar"));
   private Analyzer analyzer;
 
   @Override

lucene/analysis/icu/src/test/org/apache/lucene/analysis/icu/TestICUCollationKeyAnalyzer.java

@@ -24,7 +24,7 @@ import org.apache.lucene.util.BytesRef;
 
 public class TestICUCollationKeyAnalyzer extends CollationTestBase {
 
-  private Collator collator = Collator.getInstance(Locale.of("fa"));
+  private Collator collator = Collator.getInstance(Locale.forLanguageTag("fa"));
   private Analyzer analyzer;
 
   @Override

lucene/benchmark/src/java/org/apache/lucene/benchmark/byTask/tasks/NewLocaleTask.java

@@ -49,10 +49,23 @@ public class NewLocaleTask extends PerfTask {
   static Locale createLocale(String language, String country, String variant) {
     if (language == null || language.length() == 0) return null;
 
-    String lang = language;
-    if (lang.equalsIgnoreCase("ROOT")) lang = ""; // empty language is the root locale in the JDK
+    if (language.equalsIgnoreCase("ROOT")) {
+      return Locale.ROOT;
+    }
 
-    return Locale.of(lang, country, variant);
+    StringBuilder sb = new StringBuilder();
+    sb.append(language);
+    if (country.length() > 0) {
+      sb.append('-');
+      sb.append(country);
+
+      if (variant.length() > 0) {
+        sb.append('-');
+        sb.append(variant);
+      }
+    }
+
+    return Locale.forLanguageTag(sb.toString());
   }
 
   @Override

lucene/benchmark/src/test/org/apache/lucene/benchmark/byTask/TestPerfTasksLogic.java

@@ -793,19 +793,19 @@ public class TestPerfTasksLogic extends BenchmarkTestCase {
 
     // ROOT locale
     benchmark = execBenchmark(getLocaleConfig("ROOT"));
-    assertEquals(Locale.of(""), benchmark.getRunData().getLocale());
+    assertEquals(Locale.ROOT, benchmark.getRunData().getLocale());
 
     // specify just a language
     benchmark = execBenchmark(getLocaleConfig("de"));
-    assertEquals(Locale.of("de"), benchmark.getRunData().getLocale());
+    assertEquals(Locale.forLanguageTag("de"), benchmark.getRunData().getLocale());
 
     // specify language + country
     benchmark = execBenchmark(getLocaleConfig("en,US"));
-    assertEquals(Locale.of("en", "US"), benchmark.getRunData().getLocale());
+    assertEquals(Locale.forLanguageTag("en-US"), benchmark.getRunData().getLocale());
 
     // specify language + country + variant
     benchmark = execBenchmark(getLocaleConfig("no,NO,NY"));
-    assertEquals(Locale.of("no", "NO", "NY"), benchmark.getRunData().getLocale());
+    assertEquals(Locale.forLanguageTag("no-NO-NY"), benchmark.getRunData().getLocale());
   }
 
   private String[] getLocaleConfig(String localeParam) {

lucene/benchmark/src/test/org/apache/lucene/benchmark/byTask/feeds/TestHtmlParser.java

@@ -96,7 +96,7 @@ public class TestHtmlParser extends LuceneTestCase {
   public void testTurkish() throws Exception {
     final Locale saved = Locale.getDefault();
     try {
-      Locale.setDefault(Locale.of("tr", "TR"));
+      Locale.setDefault(Locale.forLanguageTag("tr-TR"));
       String text =
           "<html><HEAD><TITLE>ııı</TITLE></head><body>"
               + "<IMG SRC=\"../images/head.jpg\" WIDTH=570 HEIGHT=47 BORDER=0 ALT=\"ş\">"

lucene/luke/src/java/org/apache/lucene/luke/app/desktop/components/fragments/search/QueryParserPaneProvider.java

@@ -421,7 +421,7 @@ public final class QueryParserPaneProvider implements QueryParserTabOperator {
         .fuzzyMinSim(fuzzyMinSimFloat)
         .fuzzyPrefixLength(fuzzyPrefLenInt)
         .dateResolution(DateTools.Resolution.valueOf((String) dateResCB.getSelectedItem()))
-        .locale(Locale.of(locationTF.getText()))
+        .locale(Locale.forLanguageTag(locationTF.getText()))
         .timeZone(TimeZone.getTimeZone(timezoneTF.getText()))
         .typeMap(typeMap)
         .build();

lucene/queryparser/src/test/org/apache/lucene/queryparser/flexible/messages/TestNLS.java

@@ -68,7 +68,7 @@ public class TestNLS extends LuceneTestCase {
   }
 
   public void testNLSLoading_xx_XX() {
-    Locale locale = Locale.of("xx", "XX", "");
+    Locale locale = Locale.forLanguageTag("xx-XX");
     String message =
         NLS.getLocalizedMessage(
             MessagesTestBundle.Q0004E_INVALID_SYNTAX_ESCAPE_UNICODE_TRUNCATION, locale);