CODEWITHSUNDEEP
javaguava
Aritz
Aritz

Reputation: 31651

Pass an extra (second) argument to Guava Predicate

I've got this Predicate, which filters my Task objects based in a date:

Predicate<Task> startDateFiltering = new Predicate<Task>() {
    @Override
    public boolean apply(Task input) {
        return input.getStartDate() != null
                && input.getStartDate().after(date);
    }

};

There's no problem to use it as long as date variable is accessible in the context. However, I'll like to make it reusable and embed it in the Task class itself, doing something like this:

public static final Predicate<Task> startDateFiltering = new Predicate<Task>() {
    @Override
    public boolean apply(Task input) {
        return input.getStartDate() != null
                && input.getStartDate().after(date);
    }

};

In order to access it as Task.startDateFiltering each time I need it. But how to pass the date argument to it?

Upvotes: 6

Views: 4726

Answers (2)

ssedano
ssedano

Reputation: 8432

Wrap it into a method (Factory pattern kind of).

public static Predicate<Task> startDateFiltering(Date date) {
    return new Predicate<Task>() {
       public boolean apply(Task input) {
             return input.getStartDate() != null
            && input.getStartDate().after(date);
       }
    }
 }

Upvotes: 4

Sotirios Delimanolis
Sotirios Delimanolis

Reputation: 279950

I'd create a static factory method (or just directly a new instance every time)

public static Predicate<Task> startDateFilteringWithDate(final Date date) {
    return new Predicate<Task>() {
        @Override
        public boolean apply(Task input) {
            return input.getStartDate() != null
                && input.getStartDate().after(date);
        }
    };
}

Upvotes: 18

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