protected DebuggerCommandImpl getBuildNodeCommand(final DebuggerTreeNodeImpl node) {
    if (node.getDescriptor() instanceof ThreadDescriptorImpl) {
      return new BuildThreadCommand(node);
    }
    else if (node.getDescriptor() instanceof ThreadGroupDescriptorImpl) {
      return new BuildThreadGroupCommand(node);
    }
    LOG.assertTrue(false);
    return null;
  }
protected DebuggerCommandImpl getBuildNodeCommand(final DebuggerTreeNodeImpl node)