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Apex Documentation on Custom Iterators make my brain hurt

Looking at the Apex documentation for Custom Iterators:



Code samples could use a bit of work:


IterableString x = new IterableString('This is a really cool test.');



(Note that there is no implementation provided for IterableString class)



global class CustomIterable implements Iterator<Account>{
List<Account> accs {get; set;}
Integer i {get; set;}
public CustomIterable(){
accs = [SELECT id, name, numberofEmployees FROM Account WHERE name = 'false'];
i = 0;
global boolean hasNext(){
if(i >= accs.size())
return false;
return true;
global Account next(){
if(i == 8){ i++; return null;}
return accs[i-1];


global class foo implements iterable<Account>{
global Iterator<Account> Iterator(){
return new CustomIterable();


global class batchClass implements Database.batchable<Account>{
global Iterable<Account> start(Database.batchableContext info){
return new foo();
global void execute(Database.batchableContext info, List<Account> scope){
List<Account> accsToUpdate = new List<Account>();
for(Account a : scope){ = 'true';
a.numberOfEmployees = 69;
update accsToUpdate;
global void finish(Database.batchableContext info){


Code samples are a bit sloppy (i.e. "if(i == 8){ i++; return null}") and don't really demonstrate anything useful. 


Edit 12/17/2009: Revised some of my earlier comments - which were a bit nitpicky and not entirely correct. 


Message Edited by glorge on 12-17-2009 10:01 AM