Add method to both get and set external array data.

src/org/mozilla/javascript/ScriptableObject.java

@@ -864,7 +864,7 @@ void addLazilyInitializedValue(String name, int index,
      *
      * @param array the List to use for delegated property access. Set this to null to revert back to regular
      *              property access.
-     * @since 1.8.0
+     * @since 1.7.6
      */
     public void setExternalArrayData(ExternalArrayData array)
     {
@@ -879,6 +879,17 @@ public void setExternalArrayData(ExternalArrayData array)
         }
     }
 
+    /**
+     * Return the array that was previously set by the call to "setExternalArrayData".
+     *
+     * @return the array, or null if it was never set
+     * @since 1.7.6
+     */
+    public ExternalArrayData getExternalArrayData()
+    {
+        return externalData;
+    }
+
     /**
      * This is a function used by setExternalArrayData to dynamically get the "length" property value.
      */