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Fixing the optaplanner guide #15702

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May 11, 2021
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Fixing the optaplanner guide #15702

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8 changes: 5 additions & 3 deletions docs/src/main/asciidoc/optaplanner.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -445,13 +445,15 @@ public class TimeTableConstraintProvider implements ConstraintProvider {
// A room can accommodate at most one lesson at the same time.

// Select a lesson ...
return constraintFactory.from(Lesson.class)
// ... and pair it with another lesson ...
return constraintFactory
.from(Lesson.class)
.join(Lesson.class,
// ... in the same timeslot ...
Joiners.equal(Lesson::getTimeslot),
// ... in the same room ...
Joiners.equal(Lesson::getRoom))
Joiners.equal(Lesson::getRoom),
// Avoiding repeated pairs (A -> B, B -> A)
Joiners.lessThan(Lesson::getId))
// then penalize each pair with a hard weight.
.penalize("Room conflict", HardSoftScore.ONE_HARD);
}
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