making excel non URL based links adapt to a StringCell rather than Hy…

…perLinkCell. Java throws a MalformedURLException otherwise

src/main/java/bad/robot/excel/matchers/CellType.java

@@ -62,10 +62,14 @@ public Cell adapt(org.apache.poi.ss.usermodel.Cell cell) {
     String(CELL_TYPE_STRING) {
         @Override
         public Cell adapt(org.apache.poi.ss.usermodel.Cell cell) {
-            if (cell.getHyperlink() != null)
+            if (cell.getHyperlink() != null && containsUrl(cell.getHyperlink()))
                 return new HyperlinkCell(hyperlink(cell.getStringCellValue(), cell.getHyperlink().getAddress()));
             return new StringCell(cell.getStringCellValue());
         }
+
+        private boolean containsUrl(org.apache.poi.ss.usermodel.Hyperlink hyperlink) {
+            return hyperlink.getAddress().startsWith("http://") || hyperlink.getAddress().startsWith("file://");
+        }
     },
     Blank(CELL_TYPE_BLANK) {
         @Override

src/test/java/bad/robot/excel/matchers/CellTypeTest.java

@@ -83,6 +83,11 @@ public void adaptHyperlinkCell() throws Exception {
         assertThat(adaptPoi(getCellForCoordinate(coordinate(B, 5), workbook)), is(instanceOf(HyperlinkCell.class)));
     }
 
+    @Test
+    public void adaptInternalLinkCell() throws IOException {
+        assertThat(adaptPoi(getCellForCoordinate(coordinate(B, 9), workbook)), is(instanceOf(StringCell.class)));
+    }
+
     @Test
     public void adaptBlankCell() throws IOException {
         assertThat(adaptPoi(getCellForCoordinate(coordinate(C, 1), workbook)), is(instanceOf(BlankCell.class)));