Review requested changes

Author: jsotuyod

src/main/java/net/sourceforge/pmd/util/fxdesigner/DesignerStarter.java

@@ -34,9 +34,6 @@ public final class DesignerStarter {
 
     private static final int MIN_JAVAFX_VERSION_ON_MAC_OSX = 14;
 
-    private static final int ERROR_EXIT = 1;
-    private static final int OK = 0;
-
     private DesignerStarter() {
     }
 
@@ -61,7 +58,7 @@ private static MainCliArgs readParameters(String[] argv) {
 
             if (argsObj.help) {
                 System.out.println(getHelpText(jCommander));
-                System.exit(OK);
+                System.exit(ExitStatus.OK.getCode());
             }
 
             return argsObj;
@@ -70,7 +67,7 @@ private static MainCliArgs readParameters(String[] argv) {
             System.out.println(e.getMessage());
             System.out.println();
             System.out.println(getHelpText(jCommander));
-            System.exit(OK);
+            System.exit(ExitStatus.OK.getCode());
             throw new AssertionError();
         }
 
@@ -81,14 +78,13 @@ private static MainCliArgs readParameters(String[] argv) {
      * Starting from PMD 7.0.0 this method usage will be limited for development.
      * CLI support will be provided by pmd-cli
      */
-    @Deprecated
     @InternalApi
     public static void main(String[] args) {
 
         readParameters(args);
 
-        final int ret = launchGui(args);
-        System.exit(ret);
+        final ExitStatus ret = launchGui(args);
+        System.exit(ret.getCode());
     }
 
     private static void setSystemProperties() {
@@ -148,7 +144,7 @@ private static String getHelpText(JCommander jCommander) {
     }
 
     @SuppressWarnings("PMD.AvoidCatchingThrowable")
-    public static int launchGui(String[] args) {
+    public static ExitStatus launchGui(String[] args) {
         setSystemProperties();
 
         String message = null;
@@ -161,16 +157,31 @@ public static int launchGui(String[] args) {
         if (message != null) {
             System.err.println(message);
             JOptionPane.showMessageDialog(null, message);
-            return ERROR_EXIT;
+            return ExitStatus.ERROR;
         }
 
         try {
             Application.launch(Designer.class, args);
         } catch (Throwable unrecoverable) {
             unrecoverable.printStackTrace();
-            return ERROR_EXIT;
+            return ExitStatus.ERROR;
         }
 
-        return OK;
+        return ExitStatus.OK;
+    }
+
+    public enum ExitStatus {
+        OK(0),
+        ERROR(1);
+
+        private final int code;
+
+        ExitStatus(final int code) {
+            this.code = code;
+        }
+
+        public int getCode() {
+            return code;
+        }
     }
 }