Add a toBuilder method to do:

CSVFormat format = CSVFormat.EXCEL.toBuilder().withHeader("Col1", "Col2", "Col3").build();
Instead of:
CSVFormat format = CSVFormat.newBuilder(CSVFormat.EXCEL).withHeader("Col1", "Col2", "Col3").build();


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1460254 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

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

@@ -470,6 +470,15 @@ public boolean equals(final Object obj) {
         return true;
     }
 
+    /**
+     * Creates a builder based on this format.
+     * 
+     * @return a new builder
+     */
+    public CSVFormatBuilder toBuilder() {
+        return new CSVFormatBuilder(this);
+    }
+
     /**
      * Builds CSVFormat objects.
      */

src/test/java/org/apache/commons/csv/CSVFormatBuilderTest.java

@@ -59,6 +59,8 @@ public void testCopiedFormatIsEqualToOriginal() {
     public void testCopiedFormatWithChanges() {
         final CSVFormat newFormat = CSVFormat.newBuilder(RFC4180).withDelimiter('!').build();
         assertTrue(newFormat.getDelimiter() != RFC4180.getDelimiter());
+        final CSVFormat newFormat2 = RFC4180.toBuilder().withDelimiter('!').build();
+        assertTrue(newFormat2.getDelimiter() != RFC4180.getDelimiter());
     }
 
     @Test