Refactoring: removing BlenderContext cleaning; reference to the instance of this class is lost instead after the loading is done.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10875 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/blender/com/jme3/scene/plugins/blender/BlenderContext.java

@@ -38,7 +38,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Stack;
-import java.util.logging.Logger;
 
 import com.jme3.animation.Bone;
 import com.jme3.animation.Skeleton;
@@ -64,8 +63,6 @@ import com.jme3.scene.plugins.blender.meshes.MeshContext;
  * @author Marcin Roguski (Kaelthas)
  */
 public class BlenderContext {
-    private static final Logger                 LOGGER                 = Logger.getLogger(BlenderContext.class.getName());
-
     /** The blender file version. */
     private int                                 blenderVersion;
     /** The blender key. */
@@ -78,9 +75,10 @@ public class BlenderContext {
     private BlenderInputStream                  inputStream;
     /** The asset manager. */
     private AssetManager                        assetManager;
+    /** The blocks read from the file. */
+    protected List<FileBlockHeader> blocks;
     /**
-     * A map containing the file block headers. The key is the old pointer
-     * address.
+     * A map containing the file block headers. The key is the old memory address.
      */
     private Map<Long, FileBlockHeader>          fileBlockHeadersByOma  = new HashMap<Long, FileBlockHeader>();
     /** A map containing the file block headers. The key is the block code. */
@@ -613,26 +611,6 @@ public class BlenderContext {
         return markersMap == null ? null : markersMap.get(feature);
     }
 
-    /**
-     * Clears all sotred resources and closes the blender input stream.
-     */
-    public void dispose() {
-        LOGGER.fine("Disposing blender context resources.");
-        inputStream.forceClose();
-        loadedFeatures.clear();
-        loadedFeaturesByName.clear();
-        parentStack.clear();
-        constraints.clear();
-        animData.clear();
-        skeletons.clear();
-        meshContexts.clear();
-        boneContexts.clear();
-        helpers.clear();
-        fileBlockHeadersByOma.clear();
-        fileBlockHeadersByCode.clear();
-        markers.clear();
-    }
-
     /**
      * This enum defines what loaded data type user wants to retreive. It can be
      * either filled structure or already converted data.

engine/src/blender/com/jme3/scene/plugins/blender/BlenderLoader.java

@@ -139,10 +139,11 @@ public class BlenderLoader implements AssetLoader {
                 loadingResults.addScene(this.toScene(sceneBlock.getStructure(blenderContext)));
             }
 
-            blenderContext.dispose();
             return loadingResults;
         } catch (BlenderFileException e) {
             throw new IOException(e.getLocalizedMessage(), e);
+        } finally {
+            this.clear();
         }
     }
 
@@ -267,4 +268,13 @@ public class BlenderLoader implements AssetLoader {
             blenderContext.setSceneStructure(sceneFileBlock.getStructure(blenderContext));
         }
     }
+
+    /**
+     * The internal data is only needed during loading so make it unreachable so that the GC can release
+     * that memory (which can be quite large amount).
+     */
+    protected void clear() {
+        blenderContext = null;
+        blocks = null;
+    }
 }

engine/src/blender/com/jme3/scene/plugins/blender/BlenderModelLoader.java

@@ -69,11 +69,11 @@ public class BlenderModelLoader extends BlenderLoader {
                     ObjectHelper objectHelper = blenderContext.getHelper(ObjectHelper.class);
                     Object object = objectHelper.toObject(block.getStructure(blenderContext), blenderContext);
                     if (object instanceof LightNode && (blenderKey.getFeaturesToLoad() & FeaturesToLoad.LIGHTS) != 0) {
-                        rootObjects.add((LightNode)object);
+                        rootObjects.add((LightNode) object);
                     } else if (object instanceof Node && (blenderKey.getFeaturesToLoad() & FeaturesToLoad.OBJECTS) != 0) {
                         LOGGER.log(Level.FINE, "{0}: {1}--> {2}", new Object[] { ((Node) object).getName(), ((Node) object).getLocalTranslation().toString(), ((Node) object).getParent() == null ? "null" : ((Node) object).getParent().getName() });
                         if (((Node) object).getParent() == null) {
-                            rootObjects.add((Node)object);
+                            rootObjects.add((Node) object);
                         }
                     }
                 }
@@ -83,20 +83,21 @@ public class BlenderModelLoader extends BlenderLoader {
             ConstraintHelper constraintHelper = blenderContext.getHelper(ConstraintHelper.class);
             constraintHelper.bakeConstraints(blenderContext);
 
-            //attach the nodes to the root node at the very end so that the root objects have no parents during constraint applying
+            // attach the nodes to the root node at the very end so that the root objects have no parents during constraint applying
             LOGGER.fine("Creating the root node of the model and applying loaded nodes of the scene to it.");
             Node modelRoot = new Node(blenderKey.getName());
-            for(Node node : rootObjects) {
-                if(node instanceof LightNode) {
+            for (Node node : rootObjects) {
+                if (node instanceof LightNode) {
                     modelRoot.addLight(((LightNode) node).getLight());
                 }
                 modelRoot.attachChild(node);
             }
 
-            blenderContext.dispose();
             return modelRoot;
         } catch (BlenderFileException e) {
             throw new IOException(e.getLocalizedMessage(), e);
+        } finally {
+            this.clear();
         }
     }
 }

engine/src/blender/com/jme3/scene/plugins/blender/file/BlenderInputStream.java

@@ -106,7 +106,7 @@ public class BlenderInputStream extends InputStream {
             this.readFileHeader();
         } catch (BlenderFileException e) {// the file might be packed, don't panic, try one more time ;)
             this.decompressFile();
-            this.position = 0;
+            position = 0;
             this.readFileHeader();
         }
     }
@@ -363,16 +363,9 @@ public class BlenderInputStream extends InputStream {
 
     @Override
     public void close() throws IOException {
-        // this method is unimplemented because some loaders (ie. TGALoader) have flaws that close the stream given from the outside
+        // this method is unimplemented because some loaders (ie. TGALoader) tend close the stream given from the outside
         // because the images can be stored directly in the blender file then this stream is properly positioned and given to the loader
         // to read the image file, that is why we do not want it to be closed before the reading is done
-        // to properly close the stream use forceClose() method
-    }
-
-    /**
-     * This method should be used to close the stream because some loaders may close the stream while reading resources from it.
-     */
-    public void forceClose() {
-        cachedBuffer = null;
+        // and anyway this stream is only a cached buffer, so it does not hold any open connection to anything
     }
 }