6581899: JTextField & JTextArea - Poor performance with JRE 1.5.0_08

Summary: acquire the first|last components only when the key is a traversal key
Reviewed-by: ant

src/share/classes/sun/awt/EmbeddedFrame.java

@@ -257,23 +257,29 @@ public abstract class EmbeddedFrame extends Frame
         Set toTest;
         Component currentFocused = e.getComponent();
 
-        Component last = getFocusTraversalPolicy().getLastComponent(this);
         toTest = getFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS);
-        if (toTest.contains(stroke) && (currentFocused == last || last == null)) {
+        if (toTest.contains(stroke)) {
+            // 6581899: performance improvement for SortingFocusTraversalPolicy
+            Component last = getFocusTraversalPolicy().getLastComponent(this);
+            if (currentFocused == last || last == null) {
                 if (traverseOut(FORWARD)) {
                     e.consume();
                     return true;
                 }
             }
+        }
 
-        Component first = getFocusTraversalPolicy().getFirstComponent(this);
         toTest = getFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS);
-        if (toTest.contains(stroke) && (currentFocused == first || first == null)) {
+        if (toTest.contains(stroke)) {
+            // 6581899: performance improvement for SortingFocusTraversalPolicy
+            Component first = getFocusTraversalPolicy().getFirstComponent(this);
+            if (currentFocused == first || first == null) {
                 if (traverseOut(BACKWARD)) {
                     e.consume();
                     return true;
                 }
             }
+        }
         return false;
     }