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thoban2 Question on Sample Custom Iterator
Below is an example provided in the Apex manual that shows a custom iterator. There is a line that I find confusing found in the method called "next()":
if(i == 8){ i++; return null;}
Does anyone know what this is for? I am inclined to dismiss it. However, maybe there is something that I don't understand about the "iterable" and "iterator" interfaces.
If anyone has insights, please let me know.
Thanks
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;
else
return true;
}
global Account next(){
if(i == 8){ i++; return null;}
i=i+1;
return accs[i-1];
}
}
I guess that line is there to prevent a user trying to access an index in the list that doesn't exist.
EX: the list has 7 items, you are trying to access the 8th items on the list.
I guess the 8 there should be accs.size(), like what they have in hasNext().
The test for i==8 is there to illustrate a next() method that does something other than always return the next element in an arbitrary list of size n. In this case, next() returns null when the [8]th element is requested - meaning, no more elements in the list. Any other elements are ignored.
Kind of an artificial example