NumberFormatter(Number number,
    Environment env) 
{
                this.number = number;
                this.env = env;
                defaultFormat = env.getNumberFormatObject(env.getNumberFormat());
}

 public Object exec(List arguments) throws TemplateModelException 
{
                if (arguments.size() != 1) {
                    throw new TemplateModelException(
                            "number?string(...) requires exactly 1 argument.");
                }
                return get((String) arguments.get(0));
}

 public TemplateModel get(String key) 
{
                return new SimpleScalar(env.getNumberFormatObject(key).format(number));
}

 public String getAsString() 
{
                if(cachedValue == null) {
                    cachedValue = defaultFormat.format(number);
                }
                return cachedValue;
}

 public boolean isEmpty() 
{
                return false;
}