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How to aggregate values in a list by specific elements

Posted on 2014-02-07
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Last Modified: 2016-02-17
I'm using the salesforce (apex) language, so I'm posting in the java group since apex is a derivative of the java language.  I hope someone can help.

I have a batch program I'm working on that contains a list of sobjects that haven't been inserted and I need to loop over the list and find the elements in the list that have the same fund and contact and aggregate several fields. Once I have the new list, then I do the insert.

I've been struggling on how to correctly loop over my list to find the same elements by fund and contact and then do the aggregation of the currency fields? The first issue is that the list isn't sorted so how do I find the correct elements to aggregate the values?

This is the pattern I was tyring, but it doesn't work.

List<My_SObject__c> listToInsert = new List<My_SObject__c>();
String fundName = '';
Id contactId = null;
for(My_SObject__c obj : tempList) {
    if(obj.FundName__c = fundName && obj.Contact__c == contactId) {
        obj.MyCurrencyFieldToAggregate__c += obj.MyCurrencyFieldToAggregate__c;
        listToInsert.add(obj);
    }
 fundName = obj.FundName__c;
 contactId = obj.Contact__c;
}

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Any help is appreciated.
Thanks.
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Question by:-Dman100-
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LVL 86

Expert Comment

by:CEHJ
ID: 39842901
You could aggregate by using Set operations with a wrapper class. Better to demonstrate: run the following and note the aggregation by 'fund' and 'contact'
Sales.java
SalesWrapper.java
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Author Comment

by:-Dman100-
ID: 39843154
Hi CEHJ,

Thanks for the example, I'm looking at the code and trying to decipher what it is doing.  Can you explain the aggregation portion?  Is the aggregation occurring in the SalesWrapper class in the two overridden methods?

Thanks for your help!  I very much appreciate it!
Regards.
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LVL 86

Accepted Solution

by:
CEHJ earned 2000 total points
ID: 39843201
The aggregation is occurring as a result of the wrapper class implementing equals using the key criteria of fund and contact. It ignores any other attributes. Equality is met by fund and contact matching
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