Regenerate Explosion

ExplosionListener.java

package <your-package>;

import java.util.ArrayList;
import java.util.List;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.entity.TNTPrimed;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockPhysicsEvent;
import org.bukkit.event.entity.EntityExplodeEvent;

public class ExplosionListener implements Listener {

	private List<Location> physicBlock = new ArrayList<Location>();
	
	@EventHandler
	public void onExplode(final EntityExplodeEvent e) {
		
		if(!(e.getEntity() instanceof TNTPrimed)) {
			return;
		}

		final List<ExplodedBlock> blocks = new ArrayList<ExplodedBlock>();
		
		for(Block b : e.blockList()) {
			blocks.add(new ExplodedBlock(b));
			
			if(b.getType() == Material.SAND || b.getType() == Material.GRAVEL) {
				physicBlock.add(b.getLocation());
			}
		}
		
		Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(plugin, new Runnable() {
			
			private int count = 0;
			
			@Override
			public void run() {

				if(blocks.size() > count) {
					blocks.get(count).reset();
					count++;
				}
			}
			
		}, 120L, 5L);
		
		
	}
	
	@EventHandler
	public void preventSandFall(BlockPhysicsEvent e){
		
		if(!(physicBlock.contains(e.getBlock().getLocation()))) {
			return;
		}
		
		e.setCancelled(true);
		
		/*
		 *  Ab hier bin ich mir nicht sicher, ob das dann noch funktioniert, falls nein einfach mal auskommentieren die Zeile
		 * 
		 */
		
		physicBlock.remove(e.getBlock().getLocation());
	}
	
}


class ExplodedBlock {
	
	private Material m;
	private Location l;
	
	public ExplodedBlock(Block b) {
		this.m = b.getType();
		this.l = b.getLocation();
	}
	
	public Location getLocation() {
		return this.l;
	}
	
	public Material getMaterial() {
		return this.m;
	}
	
	public void reset() {
		l.getBlock().setType(m);
	}
	
}