private List<List<Location>> buildGridOfLocations() {
List<Location> northMostFirst = liveCellLocations.stream().sorted().collect(toList());
Location northMost = northMostFirst.get(0);
Location southMost = northMostFirst.get(northMostFirst.size() - 1);
List<Location> westMostFirst =
liveCellLocations.stream().sorted(byWestMostFirst).collect(toList());
Location westMost = westMostFirst.get(0);
Location eastMost = westMostFirst.get(westMostFirst.size() - 1);
Location topLeft = getTopLeft(northMost, westMost);
Location topRight = getTopRight(northMost, eastMost);
Location bottomLeft = getBottomLeft(northMost, southMost);
List<Location> topRow = topRowWith(topLeft, topRight);
return gridWith(topRow, topLeft, bottomLeft);
}
private List<Location> locationsOfNewbornCells() {
return liveCellLocations
.stream()
.flatMap(
l1 ->
liveCellLocations
.stream()
.flatMap(
l2 ->
liveCellLocations
.stream()
.flatMap(
l3 ->
areInNeighbourhoodOfSomeCell(l1, l2, l3)
? emptyLocationsWithLiveNeighboursInAllAndOnlyLocations(
l1, l2, l3)
: Stream.empty())))
.collect(toList());
}
private List<Location> locationsOfSurvivingCells() {
return liveCellLocations.stream().filter(aCellWillSurviveAt).collect(toList());
}