src/java.base/share/classes/sun/util/locale/provider/LocaleProviderAdapter.java

@@ -45,10 +45,11 @@
 import java.util.spi.CurrencyNameProvider;
 import java.util.spi.LocaleNameProvider;
 import java.util.spi.LocaleServiceProvider;
 import java.util.spi.TimeZoneNameProvider;
 import sun.security.action.GetPropertyAction;
+import sun.text.spi.JavaTimeDateTimePatternProvider;
 import sun.util.spi.CalendarProvider;
 
 /**
  * The LocaleProviderAdapter abstract class.
  *

@@ -426,10 +427,18 @@
      *
      * @return a CalendarProvider
      */
     public abstract CalendarProvider getCalendarProvider();
 
+    /**
+     * Returns a JavaTimeDateTimePatternProvider for this LocaleProviderAdapter,
+     * or null if no JavaTimeDateTimePatternProvider is available.
+     *
+     * @return a JavaTimeDateTimePatternProvider
+     */
+    public abstract JavaTimeDateTimePatternProvider getJavaTimeDateTimePatternProvider();
+
     public abstract LocaleResources getLocaleResources(Locale locale);
 
     public abstract Locale[] getAvailableLocales();
 
     private static final LocaleProviderAdapter NONEXISTENT_ADAPTER = new NonExistentAdapter();