PDFBOX-6049: refactor

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1927681 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/multipdf/Overlay.java

@@ -463,8 +463,9 @@ private void overlayPage(PDPage page, LayoutPage layoutPage, COSArray array,
             resources = new PDResources();
             page.setResources(resources);
         }
-        COSName xObjectId = createOverlayXObject(page, layoutPage, cloner);
-        array.add(createOverlayStream(page, layoutPage, xObjectId));
+        PDFormXObject overlayFormXObject = createOverlayFormXObject(layoutPage, cloner);
+        COSName formXObjectId = resources.add(overlayFormXObject, "OL");
+        array.add(createOverlayStream(page, layoutPage, formXObjectId));
     }
 
     private LayoutPage getLayoutPage(int pageNumber, int numberOfPages)
@@ -502,7 +503,7 @@ else if (useAllOverlayPages)
         return layoutPage;
     }
 
-    private COSName createOverlayXObject(PDPage page, LayoutPage layoutPage, PDFCloneUtility cloner)
+    private PDFormXObject createOverlayFormXObject(LayoutPage layoutPage, PDFCloneUtility cloner)
             throws IOException
     {
         PDFormXObject xobjForm = new PDFormXObject(layoutPage.overlayContentStream);
@@ -529,8 +530,7 @@ private COSName createOverlayXObject(PDPage page, LayoutPage layoutPage, PDFClon
                 break;
         }
         xobjForm.setMatrix(at);
-        PDResources resources = page.getResources();
-        return resources.add(xobjForm, "OL");
+        return xobjForm;
     }
 
     private COSStream createOverlayStream(PDPage page, LayoutPage layoutPage, COSName xObjectId)