Summary

The final modifier will be added to the BackgroundPosition, BorderImage, BorderStroke, and CornerRadii classes.

Problem

Backgrounds and borders are comprised of immutable and final types. The following types are marked with the final modifier:

• Background
• BackgroundFill
• BackgroundImage
• BackgroundSize
• Border
• BorderWidths

The following types are not marked with the final modifier:

• BackgroundPosition
• BorderImage
• BorderStroke
• CornerRadii

This is probably just an oversight, as there is no value in allowing a subsection of these types to be extended.

Solution

Add the final modifier.

Specification

--- a/modules/javafx.graphics/src/main/java/javafx/scene/layout/BackgroundPosition.java
+++ b/modules/javafx.graphics/src/main/java/javafx/scene/layout/BackgroundPosition.java
@@ -52,7 +52,7 @@
  * the Region's right edge.
  * @since JavaFX 8.0
  */
-public class BackgroundPosition implements Interpolatable<BackgroundPosition> {
+public final class BackgroundPosition implements Interpolatable<BackgroundPosition> {
     /**
      * The default BackgroundPosition for any BackgroundImage. The default
      * is to have no insets and to be defined as 0% and 0%. That is, the

--- a/modules/javafx.graphics/src/main/java/javafx/scene/layout/BorderImage.java
+++ b/modules/javafx.graphics/src/main/java/javafx/scene/layout/BorderImage.java
@@ -50,7 +50,7 @@
  * When applied to a Region with a defined shape, a BorderImage is ignored.
  * @since JavaFX 8.0
  */
-public class BorderImage implements Interpolatable<BorderImage> {
+public final class BorderImage implements Interpolatable<BorderImage> {
     /**
      * The image to be used. This will never be null. If this
      * image fails to load, then the entire BorderImage will

--- a/modules/javafx.graphics/src/main/java/javafx/scene/layout/BorderStroke.java
+++ b/modules/javafx.graphics/src/main/java/javafx/scene/layout/BorderStroke.java
@@ -48,7 +48,7 @@
  *
  * @since JavaFX 8.0
  */
-public class BorderStroke implements Interpolatable<BorderStroke> {
+public final class BorderStroke implements Interpolatable<BorderStroke> {
     /**
      * The default insets when "thin" is specified.
      */

--- a/modules/javafx.graphics/src/main/java/javafx/scene/layout/CornerRadii.java
+++ b/modules/javafx.graphics/src/main/java/javafx/scene/layout/CornerRadii.java
@@ -39,7 +39,7 @@
  *
  * @since JavaFX 8.0
  */
-public class CornerRadii implements Interpolatable<CornerRadii> {
+public final class CornerRadii implements Interpolatable<CornerRadii> {
     /**
      * A CornerRadii which is entirely empty, indicating squared corners.
      * This is the default value for a BorderStroke's radii.