RFR 8057113: (fs) Path should have a method to test the filename extension

[David Lloyd]

On Thu, Feb 15, 2018 at 8:53 PM, Brian Burkhalter
<brian.burkhalter at oracle.com> wrote:
> Here is an updated version which changes the specification and
> implementation to define things in terms of the file name element instead of
> the entire Path.

+    default String getExtension() {
+        Path fname = getFileName();
+        if (fname == null) {
+            return "";
+        }
+
+        String name = fname.toString();
+        int lastDot = name.lastIndexOf(".");
+        if (lastDot == -1 || lastDot == name.length() - 1) {
+            return "";
+        }
+
+        return name.substring(lastDot + 1);
+    }

If lastDot is 0 or all the characters preceding lastDot are '.' then
"" should be returned as well; this for example will not only return
wrong results for ".." but also e.g. ".vimrc".

-- 
- DML