package org.bukkit.event.block;

import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.event.Cancellable;
import org.bukkit.event.HandlerList;

/**
 * Represents events with a source block and a destination block, currently
 * only applies to liquid (lava and water) and teleporting dragon eggs.
 * <p>
 * If a Block From To event is cancelled, the block will not move (the liquid
 * will not flow).
 */
public class BlockFromToEvent extends BlockEvent implements Cancellable
{
	private static final HandlerList handlers = new HandlerList();
	protected Block to;
	protected BlockFace face;
	protected boolean cancel;

	public BlockFromToEvent(final Block block, final BlockFace face)
	{
		super(block);
		this.face = face;
		this.cancel = false;
	}

	public BlockFromToEvent(final Block block, final Block toBlock)
	{
		super(block);
		this.to = toBlock;
		this.face = BlockFace.SELF;
		this.cancel = false;
	}

	/**
	 * Gets the BlockFace that the block is moving to.
	 *
	 * @return The BlockFace that the block is moving to
	 */
	public BlockFace getFace()
	{
		return face;
	}

	/**
	 * Convenience method for getting the faced Block.
	 *
	 * @return The faced Block
	 */
	public Block getToBlock()
	{
		if(to == null)
		{
			to = block.getRelative(face);
		}
		return to;
	}

	public boolean isCancelled()
	{
		return cancel;
	}

	public void setCancelled(boolean cancel)
	{
		this.cancel = cancel;
	}

	@Override
	public HandlerList getHandlers()
	{
		return handlers;
	}

	public static HandlerList getHandlerList()
	{
		return handlers;
	}
}