/**
* Return the blocks that will be moved with this elevator
*
* @return The blocks that this lift will move
*/
public LiftContents getContents() {
Set<Vector3i> blocks = new HashSet<Vector3i>();
Set<Vector3i> edgeBlocks = new HashSet<Vector3i>();
Vector3i location = position.add(0, -1, 0);
travelBlocks(location, location, blocks, new HashSet<Vector3i>(), edgeBlocks);
return new LiftContents(this, edgeBlocks, blocks);
}
/**
* Go through the blocks, checking for valid ones The way this works is:
*
* <ul>
* <li>Adds the current location to the list of valid locations
* <li>Checks if the current block is within {@link LiftPlatesConfig#maxLiftSize}
* <li>Makes sure the current block is of the same type and data as the central block
* <li>If large lifts are not enabled in the configuration, also checks that the block above is
* a pressureplate (If any of the previous conditions are not met, the method does not
* continue)
* <li>Adds the current location to the list of valid locations
* <li>Runs the method on {@link LiftUtil#NSEW_FACES}, excluding locations that have already
* been visited, with the same sets of valid and visited locations
* </ul>
*
* @param start The origin block
* @param current The current block
* @param validLocations The list of already travelled and valid locations
* @param visited The list of already travelled (not necessarily valid) locations
*/
private void travelBlocks(
Vector3i start,
Vector3i current,
Set<Vector3i> validLocations,
Set<Vector3i> visited,
Set<Vector3i> edgeBlocks) {
visited.add(current);
LiftPlatesConfig config = manager.getPlugin().getConfiguration();
final int maxDist = config.maxLiftSize * config.maxLiftSize;
if (start.distanceSquared(current) > maxDist) { // Too far away
edgeBlocks.add(current);
return;
}
final World world = manager.getWorld();
if (!world.getBlock(start).equals(world.getBlock(current))) { // Different block type
edgeBlocks.add(current);
return;
}
if (!config.recursiveLifts
&& !LiftUtil.isPressurePlate(
world.getBlockType(current.add(0, 1, 0)))) { // Not a pressure plate
edgeBlocks.add(current);
return;
}
validLocations.add(current);
for (int i = 1; i < config.liftHeight; ++i) {
validLocations.add(current.add(0, i, 0));
}
for (Direction face : LiftUtil.NSEW_FACES) {
Vector3i newLoc = current.add(face.toVector3d().toInt());
if (visited.contains(newLoc)) {
continue;
}
travelBlocks(start, newLoc, validLocations, visited, edgeBlocks);
}
}