Small refactor of BaseStreamResourceWriter

src/main/java/com/flowingcode/vaadin/addons/gridexporter/BaseStreamResourceWriter.java

@@ -48,8 +48,8 @@ abstract class BaseStreamResourceWriter<T> implements StreamResourceWriter {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(BaseStreamResourceWriter.class);
 
-  protected GridExporter<T> exporter;
-  protected String template;
+  protected final GridExporter<T> exporter;
+  private String template;
 
   public BaseStreamResourceWriter(GridExporter<T> exporter) {
     super();
@@ -63,6 +63,10 @@ public BaseStreamResourceWriter(
     template = customTemplate == null ? defaultTemplate : customTemplate;
   }
 
+  protected String getTemplate() {
+    return template;
+  }
+
   /**
    * If a column was configured to be exported or not, that will be honored. If not, it will
    * exported based on the visibility
@@ -169,12 +173,12 @@ protected Stream<T> obtainDataStream(DataProvider<T, ?> dataProvider) {
     return dataStream;
   }
 
-  protected Stream<T> obtainFlattenedHierarchicalDataStream(final Grid<T> grid) {
+  private Stream<T> obtainFlattenedHierarchicalDataStream(final Grid<T> grid) {
     ArrayList<T> flattenedData = fetchDataRecursive(grid, null);
     return flattenedData.stream();
   }
 
-  protected ArrayList<T> fetchDataRecursive(final Grid<T> grid, T parent) {
+  private ArrayList<T> fetchDataRecursive(final Grid<T> grid, T parent) {
     ArrayList<T> result = new ArrayList<>();
 
     if (parent != null) result.add(parent);

src/main/java/com/flowingcode/vaadin/addons/gridexporter/DocxStreamResourceWriter.java

@@ -361,7 +361,7 @@ private XWPFTable findTable(XWPFDocument doc) {
   }
 
   private XWPFDocument getBaseTemplateDoc() throws EncryptedDocumentException, IOException {
-    InputStream inp = this.getClass().getResourceAsStream(template);
+    InputStream inp = this.getClass().getResourceAsStream(getTemplate());
     return new XWPFDocument(inp);
   }
 }

src/main/java/com/flowingcode/vaadin/addons/gridexporter/ExcelStreamResourceWriter.java

@@ -391,7 +391,7 @@ private void applyExcelFormat(Cell cell, String excelFormat, Map<String, CellSty
 
   private Workbook getBaseTemplateWorkbook() {
     try {
-      InputStream inp = this.getClass().getResourceAsStream(template);
+      InputStream inp = this.getClass().getResourceAsStream(getTemplate());
       Workbook result = WorkbookFactory.create(inp);
       return result;
     } catch (Exception e) {