Get inherited value of Rotate property

DEVSIX-1704

Author: pavel-alay

kernel/src/main/java/com/itextpdf/kernel/pdf/PdfPage.java

@@ -145,14 +145,16 @@ public Rectangle getPageSizeWithRotation() {
      */
     public int getRotation() {
         PdfNumber rotate = getPdfObject().getAsNumber(PdfName.Rotate);
-
+        int rotateValue = 0;
         if (rotate == null) {
-            return 0;
-        } else {
-            int n = rotate.intValue();
-            n %= 360;
-            return n < 0 ? n + 360 : n;
+            initParentPages();
+            rotate = (PdfNumber) getParentValue(this.parentPages, PdfName.Rotate);
+        }
+        if (rotate != null) {
+            rotateValue = rotate.intValue();
         }
+        rotateValue %= 360;
+        return rotateValue < 0 ? rotateValue + 360 : rotateValue;
     }
 
     /**

kernel/src/test/java/com/itextpdf/kernel/pdf/PdfPagesTest.java

@@ -1,6 +1,6 @@
 /*
     This file is part of the iText (R) project.
-    Copyright (c) 1998-2017 iText Group NV
+    Copyright (c) 1998-2018 iText Group NV
     Authors: iText Software.
 
     This program is free software; you can redistribute it and/or modify
@@ -415,5 +415,11 @@ public void getPageSizeWithInheritedMediaBox() throws IOException {
         pdfDoc.close();
     }
 
-
+    @Test
+    public void rotationPagesRotationTest() throws IOException {
+        String filename = "singlePageDocumentWithRotation.pdf";
+        PdfDocument pdfDoc = new PdfDocument(new PdfReader(sourceFolder + filename));
+        PdfPage page = pdfDoc.getPage(1);
+        Assert.assertEquals("Inherited value is invalid", 90, page.getRotation());
+    }
 }