PDFBOX-5660: optimize, as suggested by Valery Bokov; closes #474

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1935368 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/PDDocumentCatalog.java

@@ -415,10 +415,11 @@ public void setMarkInfo(PDMarkInfo markInfo)
      */
     public List<PDOutputIntent> getOutputIntents()
     {
-        List<PDOutputIntent> retval = new ArrayList<>();
+        List<PDOutputIntent> retval;
         COSArray array = root.getCOSArray(COSName.OUTPUT_INTENTS);
         if (array != null)
         {
+            retval = new ArrayList<>(array.size());
             for (COSBase cosBase : array)
             {
                 if (cosBase instanceof COSObject)
@@ -429,6 +430,10 @@ public List<PDOutputIntent> getOutputIntents()
                 retval.add(oi);
             }
         }
+        else
+        {
+            retval = new ArrayList<>();
+        }
         return retval;
     }