[jdom-interest] detach() from element

[Per Norrman]

Tatu Saloranta skrev:
> --- "Bradley S. Huffman" <hip at a.cs.okstate.edu> wrote:
> 
>>kandryc at miser.umass.edu writes:
>>
>>>However, when I execute the following code:
>>>
>>>List my_lists =
>>
>>theDocument.getRootElement().getChildren();
>>
>>>for (int i = 0; i < my_lists.size(); i++) {
>>>   Element next = (Element)my)lists.get(i);
>>>      if
>>
>>(next.getAttribute("refid").getValue().equals("1"))
>>{
>>
>>>         next.detach();
>>>      }
>>>}
>>>
>>>The output XML is:
>>>
>>><my-lists>
>>>   <list refid="1" date="3/22/2005 4:14 PM" />
>>>   <list refid="1" date="3/22/2005 6:01 PM" />
>>>   <list refid="2" date="3/22/2005 6:23 PM" /> 
>>></my-lists>
>>>
>>>Why are not all the elements with refid="1" not
>>
>>detached?
>>
>>Because when you remove a item from a list, all
>>items following it
>>are shifted. For example if when i == 3 the if
>>statement is true,
>>the 3rd element is removed and the old 4th element
>>becomes the new
>>3rd, the old 5th becomes the new 4th, etc, etc. Then
>>the loop ends
>>and i is incremented to 4, leaving what was the old
>>4th element untouched.
> 
> 
> This is probably true, but what confuses many people
> is that result sets are live (if they are). In this
> case, for example, he does NOT call list.remove(), but
> listItem.detach(), so behaviour could actually be
> different (for non-live result sets, List would just
> be a copy and detach() would just modify tree, not
> List).
> 
> Is there an FAQ entry that explains this? It's fairly
> straight-forward once you know the behaviour, but
> otherwise confusing.
> 
> -+ Tatu +-
> 
On the other hand, it is very well documented that
the list is live and that changes to it effects
the actual content. Doesn't people *read* the
documentation? (No, don't answer that, it is
a rhetorical question).

/pmn
> 
> 
> 
> 		
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