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+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ */
+
+package net.java.joglutils.msg.actions;
+
+import net.java.joglutils.msg.misc.*;
+import net.java.joglutils.msg.nodes.*;
+
+/** The base class of all actions, which are applied to nodes in the
+    scene graph to implement operations such as rendering. <P>
+
+    Subclasses of Action should define, by convention, a public static
+    method <CODE>getDefaultState</CODE>, returning a {@link
+    net.java.joglutils.msg.misc.State State} object, which is used to
+    enable the elements in the state which should be updated by the
+    action's traversal of nodes. Each Action instance maintains a
+    State object internally which is initialized from this
+    default. Note that different actions may enable different elements
+    of the global state.
+*/
+
+public abstract class Action {
+
+  /** Applies this Action to a particular node. This is how operations
+      such as rendering are initiated. */
+  public void apply(Node node) {
+    node.doAction(this);
+  }
+
+  /** Returns the global state this action encompasses, which is
+      altered by the nodes the action traverses. */
+  public abstract State getState();
+
+  // Visitor methods, one per node class
+
+  // FIXME: should rethink this mechanism and make it extensible as
+  // per the original Open Inventor
+  public abstract void visit    (Blend blend);
+  public abstract void visit    (Color4 colors);
+  public abstract void visit    (Coordinate3 coords);
+  public abstract void visit    (IndexedTriangleSet tris);
+  public abstract void visit    (PerspectiveCamera camera);
+  public abstract void visitPre (Separator sep);
+  public abstract void visitPost(Separator sep);
+  public abstract void visit    (Texture2 texture);
+  public abstract void visit    (TextureCoordinate2 texCoords);
+  public abstract void visit    (Transform transform);
+  public abstract void visit    (TriangleSet tris);
+}