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  1. OptaPlanner
  2. PLANNER-1613

ConstraintStreams: Add collector for toList()

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    • Icon: Enhancement Enhancement
    • Resolution: Done
    • Icon: Major Major
    • 7.34.0.Final
    • None
    • optaplanner-core
    • None

      This might work:

      public final class ConstraintCollectors {

    public static <A> UniConstraintCollector<A, ?, List<A>> toList() {
        return new DefaultUniConstraintCollector<>(
                () -> new ArrayList<A>(),
                (resultContainer, a) -> {
                    resultContainer.add(a);
                    return (() -> resultContainer.remove(a));
                },
                resultContainer -> resultContainer);
    }

      I doubt if the order of the list is stable... but it should be... even incrementally.
      Maybe we should just do a Set instead? But then we'll need to keep track of the number of additions per element.

      PS: we'll also want

       public static <A, Property_> UniConstraintCollector<A, ?, List<Property_>> toList(Function<A,Property_> groupValueMapping)

              lpetrovi@redhat.com Lukáš Petrovický (Inactive)
              gdesmet@redhat.com Geoffrey De Smet (Inactive)
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                Created:
                Updated:
                Resolved: