New QuoteMode:ALL_NON_NULL, JUnit: testQuoteModeAllNonNull

Author: kparoth

src/main/java/org/apache/commons/csv/CSVFormat.java

@@ -1040,6 +1040,7 @@ private void printAndQuote(final Object object, final CharSequence value, final
         }
         switch (quoteModePolicy) {
         case ALL:
+        case ALL_NON_NULL:
             quote = true;
             break;
         case NON_NUMERIC:

src/main/java/org/apache/commons/csv/QuoteMode.java

@@ -28,6 +28,11 @@ public enum QuoteMode {
      */
     ALL,
 
+    /**
+     * Quotes all non-null fields.
+     */
+    ALL_NON_NULL,
+
     /**
      * Quotes fields which contain special characters such as a delimiter, quotes character or any of the characters in
      * line separator.

src/test/java/org/apache/commons/csv/issues/JiraCsv203Test.java

@@ -25,6 +25,20 @@ public void testQuoteModeAll() throws Exception {
         Assert.assertEquals("\"N/A\",\"Hello\",\"N/A\",\"World\"\r\n", buffer.toString());
     }
 
+    @Test
+    public void testQuoteModeAllNonNull() throws Exception {
+        CSVFormat format = CSVFormat.EXCEL
+                .withNullString("N/A")
+                .withIgnoreSurroundingSpaces(true)
+                .withQuoteMode(QuoteMode.ALL_NON_NULL);
+
+        StringBuffer buffer = new StringBuffer();
+        CSVPrinter printer = new CSVPrinter(buffer, format);
+        printer.printRecord(new Object[] { null, "Hello", null, "World" });
+
+        Assert.assertEquals("N/A,\"Hello\",N/A,\"World\"\r\n", buffer.toString());
+    }
+
     @Test
     public void testWithoutQuoteMode() throws Exception {
         CSVFormat format = CSVFormat.EXCEL