Local storage in a stream Java 8 -


i want write stream method may need ignore several concurrent values based on "lastgoodversion" can't find way share value within stream. below i'd do. suggestions on how accomplish this?

[edit don't this, it's not how java streams work]

i don't think possible using java 8 streams. possible solution want use helper function may this:

private static <t> stream<t> progressivefilter(stream<t> stream,                                                bipredicate<t, t> predicate) {     list<t> list = stream.collect(collectors.tolist());     list<t> result = new arraylist<>();     t previousvalue = null;     (t entry : list) {         if (previousvalue == null) {             previousvalue = entry;         } else {             if (predicate.test(entry, previousvalue)) {                 result.add(previousvalue);             } else {                 previousvalue = entry;             }         }     }     if(previousvalue != null) {         result.add(previousvalue);     }     return result.stream(); }

the call trying this:

progressivefilter(     allversionsstream().filter(nstimestamp::isapproved),     (v, lastcanonicalversion) -> !v.iseffectivebefore(relativedate)                                && v.iseffectivebefore(lastcanonicalversion));

quite possibly can further optimized. principle, hope, clear.


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