since: 2.2.0 -

 public static ArrayStack<String, Object> getParameterStack(Context context) 
{
        ArrayStack< Map< String, Object > > stack = (ArrayStack< Map< String, Object > >) context
                .get(PARAMETER_MAP_STACK_KEY);
        if (stack == null) {
            stack = new ArrayStack< Map< String, Object > >();
            context.put(PARAMETER_MAP_STACK_KEY, stack);
        }
        return stack;
}

Returns or creates the parameter stack to use. It is useful to store parameters across tool calls.

 public static  void setAttribute(Context velocityContext,
    HttpServletRequest request,
    ServletContext servletContext,
    String name,
    Object obj,
    String scope) 
{
        if (scope == null) {
            scope = "page";
        }
        if ("page".equals(scope)) {
            velocityContext.put(name, obj);
        } else if ("request".equals(scope)) {
            request.setAttribute(name, obj);
        } else if ("session".equals(scope)) {
            request.getSession().setAttribute(name, obj);
        } else if ("application".equals(scope)) {
            servletContext.setAttribute(name, obj);
        }
}

Sets an attribute in the desired scope.

 public static boolean toSimpleBoolean(Boolean obj,
    boolean defaultValue) 
{
        return obj != null ? obj : defaultValue;
}

Null-safe conversion from Boolean to boolean.