Add an API to get month names.

headers/os/locale/DateFormat.h

@@ -69,6 +69,7 @@ public:
 									) const;
 
 			status_t			GetStartOfWeek(BWeekday* weekday) const;
+			status_t			GetMonthName(int month, BString& outName);
 
 								// TODO parsing
 

src/kits/locale/DateFormat.cpp

@@ -20,6 +20,7 @@
 #include <ICUWrapper.h>
 
 #include <unicode/datefmt.h>
+#include <unicode/dtfmtsym.h>
 #include <unicode/smpdtfmt.h>
 
 #include <vector>
@@ -324,6 +325,41 @@ BDateFormat::GetStartOfWeek(BWeekday* startOfWeek) const
 }
 
 
+status_t
+BDateFormat::GetMonthName(int month, BString& outName)
+{
+	BAutolock lock(fLock);
+	if (!lock.IsLocked())
+		return B_ERROR;
+
+	BString pattern;
+	fConventions.GetDateFormat(B_LONG_DATE_FORMAT, pattern);
+	DateFormat* format = _CreateDateFormatter(pattern);
+
+	SimpleDateFormat* simpleFormat = dynamic_cast<SimpleDateFormat*>(format);
+	if (simpleFormat == NULL) {
+		delete format;
+		return B_ERROR;
+	}
+
+	const DateFormatSymbols* symbols = simpleFormat->getDateFormatSymbols();
+
+	int32_t count;
+	const UnicodeString* names = symbols->getMonths(count);
+
+	if (month > count || month <= 0) {
+		delete simpleFormat;
+		return B_BAD_DATA;
+	}
+
+	BStringByteSink stringConverter(&outName);
+	names[month - 1].toUTF8(stringConverter);
+
+	delete simpleFormat;
+	return B_OK;
+}
+
+
 DateFormat*
 BDateFormat::_CreateDateFormatter(const BString& format) const
 {

src/tests/kits/locale/DateFormatTest.cpp

@@ -123,6 +123,27 @@ DateFormatTest::TestFormatDate()
 }
 
 
+void
+DateFormatTest::TestMonthNames()
+{
+	BLanguage language("en");
+	BFormattingConventions formatting("en_US");
+	BDateFormat format(&language, &formatting);
+
+	BString buffer;
+	status_t result = format.GetMonthName(1, buffer);
+
+	CPPUNIT_ASSERT_EQUAL(BString("January"), buffer);
+	CPPUNIT_ASSERT_EQUAL(B_OK, result);
+
+	buffer.Truncate(0);
+	result = format.GetMonthName(12, buffer);
+
+	CPPUNIT_ASSERT_EQUAL(BString("December"), buffer);
+	CPPUNIT_ASSERT_EQUAL(B_OK, result);
+}
+
+
 /*static*/ void
 DateFormatTest::AddTests(BTestSuite& parent)
 {
@@ -134,6 +155,8 @@ DateFormatTest::AddTests(BTestSuite& parent)
 		"DateFormatTest::TestFormat", &DateFormatTest::TestFormat));
 	suite.addTest(new CppUnit::TestCaller<DateFormatTest>(
 		"DateFormatTest::TestFormatDate", &DateFormatTest::TestFormatDate));
+	suite.addTest(new CppUnit::TestCaller<DateFormatTest>(
+		"DateFormatTest::TestMonthNames", &DateFormatTest::TestMonthNames));
 
 	parent.addTest("DateFormatTest", &suite);
 }

src/tests/kits/locale/DateFormatTest.h

@@ -18,6 +18,7 @@ public:
 			void	TestCustomFormat();
 			void	TestFormat();
 			void	TestFormatDate();
+			void	TestMonthNames();
 
 	static	void	AddTests(BTestSuite& suite);
 };