Simple way to use parameterised UI messages in Wicket?

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Wicket has a flexible internationalisation system that supports parameterising UI messages in many ways. There are examples e.g. in StringResourceModel javadocs, such as this:

WeatherStation ws = new WeatherStation();
add(new Label("weatherMessage", new StringResourceModel(
    "weather.${currentStatus}", this, new Model<String>(ws)));

But I want something really simple, and couldn't find a good example of that.

Consider this kind of UI message in a .properties file:

msg=Value is {0}

Specifically, I wouldn't want to create a model object (with getters for the values to be replaced; like WeatherStation in the above example) only for this purpose. That's just overkill if I already have the values in local variables, and there is otherwise no need for such object.

Here's a stupid "brute force" way to replace the {0} with the right value:

String value = ... // contains the dynamic value to use
add(new Label("message", getString("msg").replaceAll("\\{0\\}", value)));

Is there a clean, more Wicket-y way to do this (that isn't awfully much longer than the above)?

wicket internationalization properties java
6 Answers

In case you have a Model in your Component which holds an object with values you want to access from your placeholders as substitutions, you can write:

new StringResourceModel("salutation.text", getModel());

Let's imagine getModel()'s return type is IModel<User> and User contains fields like firstName and lastName. In this case you can easily access firstName and lastName fields inside your property string:

salutation.text=Hej ${firstName} ${lastName}, have a nice day!

Further information you can find here: https://ci.apache.org/projects/wicket/apidocs/8.x/org/apache/wicket/model/StringResourceModel.html#StringResourceModel-java.lang.String-org.apache.wicket.model.IModel-

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