No-reuse-streams

[Paul Sandoz]

On Nov 26, 2012, at 6:39 PM, Remi Forax <forax at univ-mlv.fr> wrote:

> On 11/26/2012 06:22 PM, Paul Sandoz wrote:
>> On Nov 26, 2012, at 5:45 PM, Henry Jen <henry.jen at oracle.com> wrote:
>> 
>>> On Nov 26, 2012, at 8:21 AM, "David M. Lloyd" <david.lloyd at redhat.com> wrote:
>>> 
>>>>> Should the following throw an ISE on the last line of the following?
>>>>> 
>>>>> Stream s = ..
>>>>> Object i1 = s.findFirst();
>>>>> Stream s1 = s.map(...);
>>>>> 
>>>>> i.e. should we fail on the s.map(...) or just when a terminal operation occurs, if at all?
>>>> I agree with you and Rémi - this should fail.
>>>> 
>>> 
>>> 
>>> While it may be "consistent", what is the obvious alternative when need to do something like this?
>>> A use case like this is probably following,
>>> 
>>> For a input stream, find a marker, and then continue to process the rest of stream.
>>> 
>> That seems like a use-case for dropWhile or skipWhile.
> 
> take the stream, create an iterator, iterate until you have your marker,
> wrap the iterator as a new stream (this trick is from Brian).
> You lost some information about the size of the stream etc,
> but usually you don't care because on a IO stream these informations are not known.
> 

Yes, use iterator as the "escape hatch".

Paul.