使用StringTemplate生成条件代码

Question

In my project, I have a class Device like this:

public class Device {
    private Set<String> abilities = new HashSet<String>();

    public Device(Set<String> abilities) {
        this.abilities = abilities;
    }

    public Set<String> getAbilities() {
        return abilities;
    }
}

I am initializing this Device class with:

Set<String> device1Abilities = new HashSet<String>();
device1Abilities.add("BadgeReader"); 
device1Abilities.add("TemperatureSensor");   
device1Abilities.add("xyz");
Device d1 = new Device(device1Abilities);

In my stringTemplateFile , I am retrieving abilities using

$device.abilities :{ sc | abilities.add("$sc$"); }$

which will generates following code =>

abilities.add("BadgeReader");
abilities.add("TemperatureSensor");
abilities.add("xyz");

Now, my requirement is ----- I do not want to generate this line of code:

abilities.add("xyz");

What condition should I specify in

 $device.abilities :{ sc | abilities.add("$sc$"); }$

so that it does not generate that line?

Answer 1

That computation really belongs in the model so you should do the filtering of the list that you passed to the template. The template should not figure out which data to display. It should display the data that your model says it should display. hope this helps.

Answer 2

See here . You are using an anonymous sub-template abilities.add("$sc$"); . Instead you can use a template call with sc as parameter. And there you can test on "xyz" . Though maybe someone with more StringTemplate experience knows a shorter notation.