Join using multiple arguments

[dschulten]

Hi,

I need to join a list of objects and extract two properties of each list item, like this:

StringBuilder sb = new StringBuilder();
for(Item item : items) {

  if (sb.length() > 0)
    sb.append(", ");

  sb.append(item.getFoo());
  sb.append(" ");
  sb.append(item.getBar());
}

The result would be something like "foo1 bar1, foo2 bar2 ...". So I would like to join using multiple on() arguments and separatory in between each argument. Is that possible with Lambdaj at all? How would you go about this?

Best regards,
Dietrich

[Mario Fusco]

Hi Dietrich,

sorry for the delay in my reply, I was on vacation.
At the moment there isn't a lambdaj feature that could allow you to easily achieve this result unless you don't want to add a getFooBar() method to your bean like:

public String getFooBar() {
    return getFoo() + " " + getBar();
}

I guess this solution is the quickest thing you could do at the moment but I also have to admit that is impractical in many cases.
I guess I could extend the functionality of the join feature, by allowing the join method to accept a varargs of arguments.
I'll keep you updated if I'll decide to do that.

Mario

[Dietrich Schulten]

Hi Mario, thank you for the response. At least I know now it isn't possible.
Best regards
Dietrich