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kullyN

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How can I retrieve data from a collection which is within a map?

This function makes a call to listCustomerbyRef which then returns a map which includes 1) param   2) collection of customer details. i need to access these customer details from the collection and have the correct commands (commented out below at bottom of code) - but i cant retrieve these values

public void testListCustomersByRef() {
            
try{
                  TestableCustomerManager cm = new TestableCustomerManager();
                  Collection cusRef = new ArrayList();
                  Map result;
                  cusRef.add("0000564");
                  
                  result = cm.listCustomersByRef(cusRef,1);

                         //code missing to go here

                  
                  /*      cust.setRef((String) result.get("ref"));
                      cust.setName((String) result.get("name"));
                      cust.setRulesRow((Long) result.get("rules_row"));
                      cust.setLftCode((String) result.get("lftCode"));
                      cust.setLunCode((String) result.get("lunCode"));
                        System.out.println(cust.getName());
               
               
               
                CustContact custContact = new CustContact();
                custContact.setTitle((String) result.get("title"));
                custContact.setForename((String) result.get("forename"));
                custContact.setSurname((String) result.get("surname"));
                custContact.setTelNo((String) result.get("telNo"));
                custContact.setFaxNumber((String) result.get("faxNumber"));
                  System.out.println(custContact.getForename());
               
               
               
                Address address = new Address();
                address.setAddLine1((String) result.get("addLine1"));
                address.setAddLine2((String) result.get("addLine2"));
                address.setAddLine3((String) result.get("addLine3"));
                address.setAddLine4((String) result.get("addLine4"));
                address.setAddLine5((String) result.get("addLine5"));
                address.setPostTown((String) result.get("postTown"));
                address.setPostcode((String) result.get("postcode"));
                address.setCountry((String) result.get("country"));
               
                custContact.setAddress(address);
                //cust.setCustContacts((Set)custContact);
                  
                  System.out.println(cust.getName());
                  System.out.println("Tested listCustomersByRef method");*/
            }
            catch(ReadException e){
                  System.out.println(e.getMessage());
            }
            catch(Exception e){
                  System.out.println(e.getMessage());
            }
      }
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zzynx
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Avatar of kullyN
kullyN

ASKER

This is the code from the class which returns the map:


Collection coll = getCollectionFromSql(sQuery, params, true, pageno, true, true);
            HashMap result = new HashMap(2);
            result.put(CommonConstants.PARAM_RESULTS, coll);
Well, then this is how you retrieve that collection:

Collection coll = (Collection) result.get(CommonConstants.PARAM_RESULTS);
And afterwards:

Iterator it = coll.iterator();
while (it.hasNext()) {
   ItemType item = (ItemType) it.next();  // ItemType being the type of the items in the collection
}
But Collection is just an interface
These are the classes that implement that interface:
AbstractCollection, AbstractList, AbstractSet, ArrayList, BeanContextServicesSupport, BeanContextSupport, HashSet, LinkedHashSet, LinkedList, TreeSet, Vector

It would be handy if you knew which one it was...
Avatar of kullyN

ASKER

none of these have worked, sorry
>> none of these have worked
What do you get?

Does

    result.containsKey(CommonConstants.PARAM_RESULTS)

return true?

If not, the collection simply isn't available in the map.
Avatar of kullyN

ASKER

i get null print statements

TestableCustomerManager cm = new TestableCustomerManager();
                  Collection cusRef = new ArrayList();
                  Map result;
                  
                  cusRef.add("0000564");
                  
                  result = cm.listCustomersByRef(cusRef,1);
                  Collection customers = (Collection)result.get(CommonConstants.PARAM_RESULTS);
                  
                  Iterator it = customers.iterator();
                  while (it.hasNext()) {
                     String item = (String) it.next();  // ItemType being the type of the items in the collection
                     System.out.println(item);
                  }
                  
What can I say?
If null's are coming out, that means that null's were added.
Time to critically investigate the working of

          result = cm.listCustomersByRef(cusRef,1);