How to do multiple finds with Java 8 stream? -

given following data structure:

class address contains:

       addressid  primary key        type       can "mail" or "legal"        address    text field containing address        personid   foreign key person class 

scenario 1 pseudo code:

list<address> addresses = new list<address>(); addresses.add(new address(1,"mail","123 main st",1)); addresses.add(new address(2,"legal","456 main st",1));  //in scenario want "mail" record returned addresses.stream().filter(e->e.gettype().equals("mail")).findfirst().orelse(...); 

scenario 2 pseudo code:

list<address> addresses = new list<address>(); addresses.add(new address(1,"legal","891 main st",2));  //in scenario want "legal" record returned addresses.stream().filter(e->e.gettype().equals("mail")).findfirst().orelse(...); 

scenario 3 pseudo code:

list<address> addresses = new list<address>();  //in scenario null or empty optional returned addresses.stream().filter(e->e.gettype().equals("mail")).findfirst().orelse(...); 

much appreicated if can out stream line of code above can handle 3 scenarios.

if list of address objects not big group them in hashmap:

    list<address> addresses = getaddressesfromstream(); // populate list address objects      // populate hashmap     map<string, list<address>> typemap = new hashmap<string, list<address>>();      (address address: addresses) {         string type;         if (stringutils.isblank(address.gettype())) {             type = "empty";         } else {             type = address.gettype();         }          list<address> group;         if (!typemap.containskey(type)) {             group = new arraylist<address>();             typemap.put(type, group);         }          group = typemap.get(type);         group.add(address);              } 

hope fits problem.