Is it possible to convert a String to a List?

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Is it possible to convert a String to a List?

luisadieze

Hi!

I imported a Shapefile to create a set of entities. One of the fields has a list of the "id" of the other entities with which it must form a graph, but the field was understood as a String. I want to convert it to a List, so I can try to build the graph. Is it possible?

Is there another way to build a graph given a set of "Id" of entities?

Thanks!

padeg

Hi Luisa,
Yes, you can use the split() function to extract every part of the String into a List. That function takes an argument that is the separator String.
Here is a couple of examples :

fix st1 = "I have a dream"
fix spst1 = st1.split(" ")
for (si:spst1) println(si)
fix st2 = "one;two;three;four"
fix spst2 = st2.split(";")
for (si:spst2) println(si)

This will print :

I
have
a
dream
one
two
three
four

You're welcome.

luisadieze

Thanks for the quick answer!

I tried to use the function as follows:

entity Actor {
   property String connections_m     //property given a Shapefile field (understood as a String). List of ID numbers separated by ",".      	
   property List<Integer> friends_m
}

  for (actor:l_actors) {
   let x_m = actor.connections_m.split(",")
   actor.friends_m = x_m
  }

And I got the error in the last line: Type mismatch: cannot convert from String[] to List<Integer>

How should I do to convert each element of the List from String to Integer?

Thanks!

padeg

Yes that's right, the split() function always produce a list of String.
I'm afraid you will have to convert every element into an Integer before you can add it to friends_m.

Something like this would make it :

for (n:x_m) friends_m.add(new Integer(n))