Solved

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

Posted on 2004-10-12
11
202 Views
Last Modified: 2010-03-31
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());
            }
      }
0
Comment
Question by:kullyN
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 6
  • 3
11 Comments
 
LVL 37

Accepted Solution

by:
zzynx earned 250 total points
ID: 12286736
>>... returns a map which includes 1) param   2) collection of customer details
What type of collection is that collection? List, Map, Set,...?

First you have to know which is the key (e.g. "coll")

List theCollection = (List) result.get("coll");
theCollection.get(0) gets the first element in that collection
0
 

Author Comment

by:kullyN
ID: 12286809
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);
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12286939
Well, then this is how you retrieve that collection:

Collection coll = (Collection) result.get(CommonConstants.PARAM_RESULTS);
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 37

Expert Comment

by:zzynx
ID: 12286960
And afterwards:

Iterator it = coll.iterator();
while (it.hasNext()) {
   ItemType item = (ItemType) it.next();  // ItemType being the type of the items in the collection
}
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12286994
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...
0
 

Author Comment

by:kullyN
ID: 12287480
none of these have worked, sorry
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12287547
>> 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.
0
 

Author Comment

by:kullyN
ID: 12288972
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);
                  }
                  
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12290802
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);
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
hibernate example for saving data 19 77
ejb stateless example 2 43
JavaFX TableView not displaying correctly 3 108
American Express @Work site and Java 4 67
After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
In this post we will learn different types of Android Layout and some basics of an Android App.
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
The viewer will learn how to implement Singleton Design Pattern in Java.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question