PDFBOX-6059: avoid ClassCastException

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1928233 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/documentinterchange/taggedpdf/PDLayoutAttributeObject.java

@@ -19,6 +19,7 @@
 import org.apache.pdfbox.cos.COSArray;
 import org.apache.pdfbox.cos.COSBase;
 import org.apache.pdfbox.cos.COSDictionary;
+import org.apache.pdfbox.cos.COSName;
 import org.apache.pdfbox.pdmodel.common.PDRectangle;
 import org.apache.pdfbox.pdmodel.graphics.color.PDGamma;
 
@@ -840,8 +841,7 @@ public void setTextAlign(String textIndent)
      */
     public PDRectangle getBBox()
     {
-        COSArray array =
-            (COSArray) this.getCOSObject().getDictionaryObject(BBOX);
+        COSArray array = this.getCOSObject().getCOSArray(COSName.BBOX);
         if (array != null)
         {
             return new PDRectangle(array);