add private constructors to utility classes

Author: stephengold

jme3-android/src/main/java/com/jme3/input/android/AndroidKeyMapping.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2012 jMonkeyEngine
+ * Copyright (c) 2009-2021 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -143,6 +143,12 @@ public class AndroidKeyMapping {
         0x0,//mute
     };
 
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private AndroidKeyMapping() {
+    }
+
     public static int getJmeKey(int androidKey) {
         if (androidKey > ANDROID_TO_JME.length) {
             return androidKey;

jme3-android/src/main/java/com/jme3/renderer/android/RendererUtil.java

@@ -51,6 +51,12 @@ public class RendererUtil {
      */
     public static boolean ENABLE_ERROR_CHECKING = true;
 
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private RendererUtil() {
+    }
+
     /**
      * Checks for an OpenGL error and throws a {@link RendererException} if
      * there is one. Ignores the value of

jme3-android/src/main/java/com/jme3/util/AndroidScreenshots.java

@@ -8,6 +8,12 @@ public final class AndroidScreenshots {
 
     private static final Logger logger = Logger.getLogger(AndroidScreenshots.class.getName());
 
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private AndroidScreenshots() {
+    }
+
     /**
      * Convert OpenGL GLES20.GL_RGBA to Bitmap.Config.ARGB_8888 and store result
      * in a Bitmap

jme3-bullet/src/common/java/com/jme3/bullet/util/CollisionShapeFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2020 jMonkeyEngine
+ * Copyright (c) 2009-2021 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -51,6 +51,11 @@
  * @author normenhansen, tim8dev
  */
 public class CollisionShapeFactory {
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private CollisionShapeFactory() {
+    }
 
     /**
      * Calculate the correct transform for a collision shape relative to the

jme3-core/src/main/java/com/jme3/anim/interpolator/AnimInterpolators.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2020 jMonkeyEngine
+ * Copyright (c) 2009-2021 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -176,5 +176,9 @@ public Float interpolate(float t, int currentIndex, TrackDataReader<Float> data,
 
     public static final TimeInterpolator constant = new TimeInterpolator(Easing.constant);
 
-
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private AnimInterpolators() {
+    }
 }

jme3-core/src/main/java/com/jme3/anim/tween/Tweens.java

@@ -52,6 +52,12 @@ public class Tweens {
     private static final CurveFunction SMOOTH = new SmoothStep();
     private static final CurveFunction SINE = new Sine();
 
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private Tweens() {
+    }
+
     /**
      * Creates a tween that will interpolate over an entire sequence
      * of tweens in order.

jme3-core/src/main/java/com/jme3/anim/util/AnimMigrationUtils.java

@@ -13,6 +13,11 @@ public class AnimMigrationUtils {
     final private static AnimControlVisitor animControlVisitor = new AnimControlVisitor();
     final private static SkeletonControlVisitor skeletonControlVisitor = new SkeletonControlVisitor();
 
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private AnimMigrationUtils() {
+    }
 
     public static Spatial migrate(Spatial source) {
         Map<Skeleton, Armature> skeletonArmatureMap = new HashMap<>();

jme3-core/src/main/java/com/jme3/anim/util/Primitives.java

@@ -33,6 +33,12 @@ public class Primitives {
         PRIMITIVE_TO_WRAPPER_TYPE = Collections.unmodifiableMap(primToWrap);
     }
 
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private Primitives() {
+    }
+
     /**
      * Returns the corresponding wrapper type of {@code type} if it is a primitive type; otherwise
      * returns {@code type} itself. Idempotent.

jme3-core/src/main/java/com/jme3/audio/AudioContext.java

@@ -40,6 +40,12 @@ public class AudioContext {
 
     final private static ThreadLocal<AudioRenderer> audioRenderer = new ThreadLocal<AudioRenderer>();
 
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private AudioContext() {
+    }
+
     public static void setAudioRenderer( AudioRenderer ar ) {
         audioRenderer.set(ar);       
     }

jme3-core/src/main/java/com/jme3/environment/LightProbeFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2020 jMonkeyEngine
+ * Copyright (c) 2009-2021 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -72,6 +72,12 @@
  */
 public class LightProbeFactory {
 
+    /**
+     * A private constructor to inhibit instantiation of this class.
+     */
+    private LightProbeFactory() {
+    }
+
     /**
      * Creates a LightProbe with the giver EnvironmentCamera in the given scene.
      *