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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.
 * 
 * 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;
  }

  public static HandlerList getHandlerList() {
    return handlers;
  }

  /**
   * 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;
  }
}