gistfile1.java

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package net.og_mc.mattsponge;

import com.google.common.base.Stopwatch;
import java.util.HashSet;
import java.util.Set;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Block;

/**
 *
 * @author ian
 */
public class BlockFinder {

    public static Set<Block> findNearbyBlocks(Location l, Material m, int radius) {
        Stopwatch s = new Stopwatch();
        s.start();
        World w = l.getWorld();

        int minX = l.getBlockX() - radius;
        int maxX = l.getBlockX() + radius;
        int minZ = l.getBlockZ() - radius;
        int maxZ = l.getBlockZ() + radius;

        // Find eligible blocks
        Set<Block> found = new HashSet<>();
        for (int i = minX; i < maxX; i++) {
            for (int j = 0; j < 256; j++) {
                zLoop:
                for (int k = minZ; k < maxZ; k++) {
                    Block block = w.getBlockAt(i, j, k);
                    if ((m == block.getType())
                            && (block.getLocation().distanceSquared(l) < radius * radius)) {
                        for (Block blok : found) {
                            if (blok.getChunk().equals(block.getChunk())) {
                                continue zLoop;
                            }
                        }
                        found.add(block);
                    }
                }
            }
        }
        s.stop();
        System.out.println("elapsed " + s.elapsedMillis() + "; radius " + radius);
        return found;
    }
}