Proposed fix for Issue#2341 - Missing default layer in AnimComposer

jme3-core/src/main/java/com/jme3/anim/AnimComposer.java

@@ -52,6 +52,7 @@
  * @author Nehon
  */
 public class AnimComposer extends AbstractControl {
+
     /**
      * The name of the default layer.
      */
@@ -121,7 +122,7 @@ public void removeAnimClip(AnimClip anim) {
      * @return The action corresponding to the given name.
      */
     public Action setCurrentAction(String name) {
-        return setCurrentAction(name, DEFAULT_LAYER);
+        return setCurrentAction(name, DEFAULT_LAYER, true);
     }
 
     /**
@@ -144,9 +145,9 @@ public Action setCurrentAction(String actionName, String layerName) {
      * @return The action corresponding to the given name.
      */
     public Action setCurrentAction(String actionName, String layerName, boolean loop) {
-        AnimLayer l = getLayer(layerName);
+        AnimLayer layer = getLayer(layerName);
         Action currentAction = action(actionName);
-        l.setCurrentAction(actionName, currentAction, loop);
+        layer.setCurrentAction(actionName, currentAction, loop);
 
         return currentAction;
     }
@@ -239,7 +240,8 @@ public void setTime(String layerName, double time) {
     /**
      *
      * @param name The name of the action to return.
-     * @return The action registered with specified name. It will make a new action if there isn't any.
+     * @return The action registered with specified name. It will make a new
+     * action if there isn't any.
      * @see #makeAction(java.lang.String)
      */
     public Action action(String name) {
@@ -254,7 +256,8 @@ public Action action(String name) {
     /**
      *
      * @param name The name of the action to return.
-     * @return The action registered with specified name or null if nothing is registered.
+     * @return The action registered with specified name or null if nothing is
+     * registered.
      */
     public Action getAction(String name) {
         return actions.get(name);
@@ -331,8 +334,8 @@ public AnimLayer removeLayer(String name) {
     }
 
     /**
-     * Creates an action that will interpolate over an entire sequence
-     * of tweens in order.
+     * Creates an action that will interpolate over an entire sequence of tweens
+     * in order.
      *
      * @param name a name for the new Action
      * @param tweens the desired sequence of tweens
@@ -374,8 +377,9 @@ public void reset() {
     }
 
     /**
-     * Returns an unmodifiable collection of all available animations. When an attempt
-     * is made to modify the collection, an UnsupportedOperationException is thrown.
+     * Returns an unmodifiable collection of all available animations. When an
+     * attempt is made to modify the collection, an
+     * UnsupportedOperationException is thrown.
      *
      * @return the unmodifiable collection of animations
      */
@@ -526,7 +530,9 @@ public void cloneFields(Cloner cloner, Object original) {
         for (String key : layers.keySet()) {
             newLayers.put(key, cloner.clone(layers.get(key)));
         }
-
+        if (!newLayers.containsKey(DEFAULT_LAYER)) {
+            newLayers.put(DEFAULT_LAYER, new AnimLayer(DEFAULT_LAYER, null));
+        }
         layers = newLayers;
 
     }
@@ -546,6 +552,9 @@ public void read(JmeImporter im) throws IOException {
         animClipMap = (Map<String, AnimClip>) ic.readStringSavableMap("animClipMap", new HashMap<String, AnimClip>());
         globalSpeed = ic.readFloat("globalSpeed", 1f);
         layers = (Map<String, AnimLayer>) ic.readStringSavableMap("layers", new HashMap<String, AnimLayer>());
+        if (!layers.containsKey(DEFAULT_LAYER)) {
+            layers.put(DEFAULT_LAYER, new AnimLayer(DEFAULT_LAYER, null));
+        }
     }
 
     /**

jme3-core/src/test/java/com/jme3/anim/AnimComposerTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2019 jMonkeyEngine
+ * Copyright (c) 2009-2024 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -32,6 +32,7 @@
 package com.jme3.anim;
 
 import com.jme3.anim.tween.action.Action;
+import com.jme3.util.clone.Cloner;
 import java.util.Set;
 import java.util.TreeSet;
 import org.junit.Assert;
@@ -57,34 +58,34 @@ public void testGetAnimClipsNames() {
         Assert.assertNotNull(composer.getAnimClipsNames());
         Assert.assertEquals(0, composer.getAnimClipsNames().size());
     }
-    
+
     @Test
     public void testMakeLayer() {
         AnimComposer composer = new AnimComposer();
-        
+
         final String layerName = "TestLayer";
 
         composer.makeLayer(layerName, null);
-        
+
         final Set<String> layers = new TreeSet<>();
         layers.add("Default");
         layers.add(layerName);
-        
+
         Assert.assertNotNull(composer.getLayer(layerName));
         Assert.assertEquals(layers, composer.getLayerNames());
     }
-    
+
     @Test
     public void testMakeAction() {
         AnimComposer composer = new AnimComposer();
-        
+
         final String animName = "TestClip";
-        
+
         final AnimClip anim = new AnimClip(animName);
         composer.addAnimClip(anim);
-        
+
         final Action action = composer.makeAction(animName);
-        
+
         Assert.assertNotNull(action);
     }
 
@@ -102,4 +103,26 @@ public void testGetAnimClipsNamesIsNotModifiable() {
         composer.getAnimClipsNames().add("test");
     }
 
+    @Test
+    public void testHasDefaultLayer() {
+        AnimComposer composer = new AnimComposer();
+
+        AnimLayer defaultLayer = composer.getLayer("Default");
+        Assert.assertNotNull(defaultLayer);
+    }
+
+    @Test
+    /**
+     * https://github.com/jMonkeyEngine/jmonkeyengine/issues/2341
+     *
+     */
+    public void testMissingDefaultLayerIssue2341() {
+        AnimComposer composer = new AnimComposer();
+        composer.removeLayer(AnimComposer.DEFAULT_LAYER);
+
+        AnimComposer clone = (AnimComposer) composer.jmeClone();
+        clone.cloneFields(new Cloner(), composer);
+        Assert.assertNotNull(clone.getLayer(AnimComposer.DEFAULT_LAYER));
+    }
+
 }