Need an example for Function<T, String>

Support
#1

Hello,
I am using version 7.1 and I need to implement the formatting of phone numbers of a column in a table for a good presentation.

import com.haulmont.cuba.gui.components.Formatter;

public class PhoneFormatter implements Formatter<String> {

    @Override
    public String format(String value) {
        if (value != null && value.length() == 9)
            return value.substring(0, 3) + "-" + value.substring(3, 6) + "-" + value.substring(6);
        return value;
    }
}

Can you give me an example with Function<T, String>

I do not understand how to implement it.

thank you so much

#2 
   import java.util.function.Function;

    public class PhoneFormatter implements Function<String, String> {
        @Override
        public String format(String value) {
            if (value != null && value.length() == 9)
                return value.substring(0, 3) + "-" + value.substring(3, 6) + "-" + value.substring(6);
            return value;
        }
    }
#3

Hi,

Below the example of implementing Function:

import java.util.function.Function;
...
public static class UppercaseFormatter implements Function<String, String> {
    @Override
    public String apply(String value) {
        return value.toUpperCase();
    }
}

Gleb

#4

Thank you Gleb !