Fix #418: Prevent NPE in OdfTable#getRowByIndex

Author: jungm

odfdom/src/main/java/org/odftoolkit/odfdom/doc/table/OdfTable.java

@@ -1709,8 +1709,8 @@ public OdfTableColumn getColumnByIndex(int index) {
     return null;
   }
 
-  private OdfTableRow getHeaderRowByIndex(TableTableHeaderRowsElement headers, int nIndex) {
-    int result = 0;
+  private OdfTableRow getHeaderRowByIndex(TableTableHeaderRowsElement headers, int nIndex, int beginIndex) {
+    int result = beginIndex;
     OdfTableRow row = null;
     for (Node n : new DomNodeList(headers.getChildNodes())) {
       if (n instanceof TableTableRowElement) {
@@ -1760,7 +1760,7 @@ public OdfTableRow getRowByIndex(int index) {
     OdfTableRow row = null;
     for (Node n : new DomNodeList(mTableElement.getChildNodes())) {
       if (n instanceof TableTableHeaderRowsElement) {
-        row = getHeaderRowByIndex((TableTableHeaderRowsElement) n, index);
+        row = getHeaderRowByIndex((TableTableHeaderRowsElement) n, index, result);
         if (row != null) {
           return row;
         }

odfdom/src/test/java/org/odftoolkit/odfdom/doc/TableTest.java

@@ -149,4 +149,11 @@ public void create2ndTableTab() throws Exception {
 
     mysheet.save(ResourceUtilities.getTestOutputFile(TEST_FILE_SAVE_2TABLES_OUT));
   }
+
+  @Test
+  public void testTableWithHeaderRowBetweenTableRows() throws Exception {
+    OdfDocument odfdoc = OdfDocument.loadDocument(ResourceUtilities.getAbsoluteInputPath("HeaderRowBetweenTableRows.ods"));
+    OdfTable table = odfdoc.getTableByName("Table1");
+    table.getRowByIndex(1);
+  }
 }