--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/macosx/classes/apple/laf/JRSUIUtils.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package apple.laf;
+
+import java.security.AccessController;
+
+import apple.laf.JRSUIConstants.Hit;
+import apple.laf.JRSUIConstants.ScrollBarPart;
+import com.apple.laf.AquaImageFactory.NineSliceMetrics;
+import sun.security.action.GetPropertyAction;
+
+public final class JRSUIUtils {
+
+    static boolean isLeopard = isMacOSXLeopard();
+    static boolean isSnowLeopardOrBelow = isMacOSXSnowLeopardOrBelow();
+
+    static boolean isMacOSXLeopard() {
+        return isCurrentMacOSXVersion(5);
+    }
+
+    static boolean isMacOSXSnowLeopardOrBelow() {
+        return currentMacOSXVersionMatchesGivenVersionRange(6, true, true, false);
+    }
+
+    static boolean isCurrentMacOSXVersion(final int version) {
+        return currentMacOSXVersionMatchesGivenVersionRange(version, true, false, false);
+    }
+
+    static boolean currentMacOSXVersionMatchesGivenVersionRange(
+            final int version, final boolean inclusive,
+            final boolean matchBelow, final boolean matchAbove) {
+        // split the "10.x.y" version number
+        String osVersion = AccessController.doPrivileged(new GetPropertyAction("os.version"));
+        String[] fragments = osVersion.split("\\.");
+
+        // sanity check the "10." part of the version
+        if (!fragments[0].equals("10")) return false;
+        if (fragments.length < 2) return false;
+
+        // check if os.version matches the given version using the given match method
+        try {
+            int minorVers = Integer.parseInt(fragments[1]);
+
+            if (inclusive && minorVers == version) return true;
+            if (matchBelow && minorVers < version) return true;
+            if (matchAbove && minorVers > version) return true;
+
+        } catch (NumberFormatException e) {
+            // was not an integer
+        }
+        return false;
+    }
+
+    public static class TabbedPane {
+        public static boolean useLegacyTabs() {
+            return isLeopard;
+        }
+        public static boolean shouldUseTabbedPaneContrastUI() {
+            return !isSnowLeopardOrBelow;
+        }
+    }
+
+    public static class InternalFrame {
+        public static boolean shouldUseLegacyBorderMetrics() {
+            return isSnowLeopardOrBelow;
+        }
+    }
+
+    public static class Tree {
+        public static boolean useLegacyTreeKnobs() {
+            return isLeopard;
+        }
+    }
+
+    public static class ScrollBar {
+        private static native boolean shouldUseScrollToClick();
+
+        public static boolean useScrollToClick() {
+            return shouldUseScrollToClick();
+        }
+
+        public static void getPartBounds(final double[] rect,
+                                         final JRSUIControl control,
+                                         final int x, final int y, final int w,
+                                         final int h,
+                                         final ScrollBarPart part) {
+            control.getPartBounds(rect, x, y, w, h, part.ordinal);
+        }
+
+        public static double getNativeOffsetChange(final JRSUIControl control,
+                                                   final int x, final int y,
+                                                   final int w, final int h,
+                                                   final int offset,
+                                                   final int visibleAmount,
+                                                   final int extent) {
+            return control.getScrollBarOffsetChange(x, y, w, h, offset,
+                                                    visibleAmount, extent);
+        }
+    }
+
+    public static class Images {
+        public static boolean shouldUseLegacySecurityUIPath() {
+            return isSnowLeopardOrBelow;
+        }
+    }
+
+    public static class HitDetection {
+        public static Hit getHitForPoint(final JRSUIControl control,
+                                         final int x, final int y, final int w,
+                                         final int h, final int hitX,
+                                         final int hitY) {
+            return control.getHitForPoint(x, y, w, h, hitX, hitY);
+        }
+    }
+
+    public interface NineSliceMetricsProvider {
+        public NineSliceMetrics getNineSliceMetricsForState(JRSUIState state);
+    }
+}