/**
* Recursively expand the search area so we can define the number of blocks that are in the
* cauldron. The search will not exceed 24 blocks as no pot will ever use up that many blocks. The
* Y are bounded both directions so we don't ever search the lava or anything above, although in
* the case of non-wall blocks, we also make sure that there is standing lava underneath.
*
* @param pt
* @param minY
* @param maxY
* @param visited
* @throws Cauldron.NotACauldronException
*/
public void findCauldronContents(
World world, BlockVector pt, int minY, int maxY, Map<BlockVector, CraftBookItem> visited)
throws NotACauldronException {
// Don't want to go too low or high
if (pt.getBlockY() < minY) {
return;
}
if (pt.getBlockY() > maxY) {
return;
}
// There is likely a leak in the cauldron (or this isn't a cauldron)
if (visited.size() > 24) {
throw new NotACauldronException("Cauldron has a leak");
}
// Prevent infinite looping
if (visited.containsKey(pt)) {
return;
}
int type = CraftBook.getBlockID(world, pt);
int data = CraftBook.getBlockData(world, pt);
if (BlockType.isDirectionBlock(type)) data = 0;
// Make water work reliably
if (type == 9) {
type = 8;
}
// Make lava work reliably
if (type == 11) {
type = 10;
}
visited.put(pt, new CraftBookItem(type, data));
// It's a wall -- we only needed to remember that we visited it but
// we don't need to recurse
if (type == BlockType.STONE) {
return;
}
// Must have a lava floor
Vector lavaPos = pt.subtract(0, pt.getBlockY() - minY + 1, 0);
if (!BlockType.isLava(CraftBook.getBlockID(world, lavaPos))) {
throw new NotACauldronException("Cauldron lacks lava below");
}
// Now we recurse!
findCauldronContents(world, pt.add(1, 0, 0).toBlockVector(), minY, maxY, visited);
findCauldronContents(world, pt.add(-1, 0, 0).toBlockVector(), minY, maxY, visited);
findCauldronContents(world, pt.add(0, 0, 1).toBlockVector(), minY, maxY, visited);
findCauldronContents(world, pt.add(0, 0, -1).toBlockVector(), minY, maxY, visited);
findCauldronContents(world, pt.add(0, 1, 0).toBlockVector(), minY, maxY, visited);
findCauldronContents(world, pt.add(0, -1, 0).toBlockVector(), minY, maxY, visited);
}
