Add CoreFoundation methods for getting current locale date format

Signed-off-by: Daniel Widdis <[email protected]>

Author: dbwiddis

CHANGES.md

@@ -8,6 +8,7 @@ Next Release (5.18.0)
 Features
 --------
 * [#1671](https://github.com/java-native-access/jna/pull/1671): Add `isRISCV` to `c.s.j.Platform` - [@Glavo](https://github.com/Glavo).
+* [#1672](https://github.com/java-native-access/jna/pull/1672): Add `CFLocale`, `CFDateFormatterStyle`, `CFLocaleCopyCurrent`, `CFDateFormatterCreate` and `CFDateFormatterGetFormat` to `c.s.j.p.mac.CoreFoundation` - [@dbwiddis](https://github.com/dbwiddis).
 
 Bug Fixes
 ---------

contrib/platform/src/com/sun/jna/platform/mac/CoreFoundation.java

@@ -1142,4 +1142,64 @@ CFMutableDictionaryRef CFDictionaryCreateMutable(CFAllocatorRef alloc, CFIndex c
      * @return The type identifier for the {@code CFString} opaque type.
      */
     CFTypeID CFStringGetTypeID();
+
+    /**
+     * The CFLocale opaque type provides support for obtaining available locales, obtaining localized locale names, and converting among locale data formats.
+     */
+    class CFLocale extends CFTypeRef {
+    }
+
+    /**
+     * Enum of values used for {@link CFDateFormatterStyle} in {@link #CFDateFormatterCreate}.
+     * Use {@link CFDateFormatterStyle#style} for the expected integer value corresponding to the C-style enum.
+     */
+    enum CFDateFormatterStyle {
+        noStyle,
+        shortStyle,
+        mediumStyle,
+        longStyle,
+        fullStyle;
+
+        /**
+         * Style for the type of {@link CFDateFormatterStyle} stored.
+         *
+         * @return a {@link CFIndex} representing the enum ordinal.
+         */
+        public CFIndex index() {
+            return new CFIndex(this.ordinal());
+        }
+    }
+
+    /**
+     * Returns a copy of the logical locale for the current user.
+     * @return The logical locale for the current user that is formed from the settings for the current user’s
+     *         chosen system locale overlaid with any custom settings the user has specified in System Preferences.
+     *         May return a retained cached object, not a new object.
+     *         <p>
+     *         This reference must be released with {@link #CFRelease} to avoid leaking references.
+     */
+    CFLocale CFLocaleCopyCurrent();
+
+    /**
+     * Creates a new CFDateFormatter object, localized to the given locale, which will format dates to the given date and time styles.
+     * @param allocator The allocator to use to allocate memory for the new object.
+     *                  Pass {@code null} or {@code kCFAllocatorDefault} to use the current default allocator.
+     * @param locale    The locale to use for localization.
+     *                  If {@code null} uses the default system locale.
+     *                  Use {@link #CFLocaleCopyCurrent()} to specify the locale of the current user.
+     * @param dateStyle The date style to use when formatting dates.
+     * @param timeStyle The time style to use when formatting times.
+     * @return A new date formatter, localized to the given locale, which will format dates to the given date and time styles.
+     *         Returns {@code null} if there was a problem creating the object.
+     *         <p>
+     *         This reference must be released with {@link #CFRelease} to avoid leaking references.
+     */
+    CFTypeRef CFDateFormatterCreate(CFAllocatorRef allocator, CFLocale locale, CFIndex dateStyle, CFIndex timeStyle);
+
+    /**
+     * Returns a format string for the given date formatter object.
+     * @param formatter The date formatter to examine.
+     * @return The format string for {@code formatter}. 
+     */
+    CFStringRef CFDateFormatterGetFormat(CFTypeRef formatter);
 }

contrib/platform/test/com/sun/jna/platform/mac/CoreFoundationTest.java

@@ -50,6 +50,7 @@
 import com.sun.jna.platform.mac.CoreFoundation.CFArrayRef;
 import com.sun.jna.platform.mac.CoreFoundation.CFDataRef;
 import com.sun.jna.platform.mac.CoreFoundation.CFIndex;
+import com.sun.jna.platform.mac.CoreFoundation.CFLocale;
 import com.sun.jna.platform.mac.CoreFoundation.CFMutableDictionaryRef;
 import com.sun.jna.platform.mac.CoreFoundation.CFNumberRef;
 import com.sun.jna.platform.mac.CoreFoundation.CFNumberType;
@@ -380,4 +381,28 @@ public void testCFEqual() {
         CF.CFRelease(s1_the_same);
         CF.CFRelease(s2);
     }
+
+    @Test
+    void testLocaleFormat() {
+        CFIndex style = CFDateFormatterStyle.noStyle.index();
+        assertEquals("", getLocaleDateTimeFormat(style));
+        style = CFDateFormatterStyle.shortStyle.index();
+        assertTrue(getLocaleDateTimeFormat(style).contains("y"));
+    }
+
+    private static String getLocaleDateTimeFormat(CFIndex style) {
+        CFLocale locale = CF.CFLocaleCopyCurrent();
+        try {
+            CFTypeRef formatter = CF.CFDateFormatterCreate(null, locale, style, style);
+            assertNotNull(formatter);
+            try {
+                CFStringRef format = CF.CFDateFormatterGetFormat(formatter);
+                return format.stringValue();
+            } finally {
+                CF.CFRelease(formatter);
+            }
+        } finally {
+            CF.CFRelease(locale);
+        }
+    }  
 }