Package org.spout.vanilla.util

Source Code of org.spout.vanilla.util.RedstoneUtil

/*
* This file is part of Vanilla.
*
* Copyright (c) 2011 Spout LLC <http://www.spout.org/>
* Vanilla is licensed under the Spout License Version 1.
*
* Vanilla is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* In addition, 180 days after any changes are published, you can use the
* software, incorporating those changes, under the terms of the MIT license,
* as described in the Spout License Version 1.
*
* Vanilla is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License,
* the MIT license and the Spout License Version 1 along with this program.
* If not, see <http://www.gnu.org/licenses/> for the GNU Lesser General Public
* License and see <http://spout.in/licensev1> for the full license, including
* the MIT license.
*/
package org.spout.vanilla.util;

import org.spout.api.geo.cuboid.Block;
import org.spout.api.material.BlockMaterial;
import org.spout.api.material.block.BlockFace;
import org.spout.api.material.block.BlockFaces;

import org.spout.vanilla.data.RedstonePowerMode;
import org.spout.vanilla.material.block.redstone.IndirectRedstoneSource;
import org.spout.vanilla.material.block.redstone.RedstoneSource;

public class RedstoneUtil {
  /**
   * Checks if the block given is a redstone conductor
   *
   * @param block to check
   * @return True if it is a redstone conductor
   */
  public static boolean isConductor(Block block) {
    return isConductor(block.getMaterial());
  }

  /**
   * Checks if the block material given is a redstone conductor
   *
   * @param mat to check
   * @return True if it is a redstone conductor
   */
  public static boolean isConductor(BlockMaterial mat) {
    return mat instanceof IndirectRedstoneSource && ((IndirectRedstoneSource) mat).isRedstoneConductor();
  }

  /**
   * Gets if the given block receives Redstone power or not
   *
   * @param block to get it of
   * @return True if it receives power, False if not
   */
  public static boolean isReceivingPower(Block block) {
    return getReceivingPowerLocation(block) != null;
  }

  /**
   * Gets the block that is powering this block, or null if none
   *
   * @param block to get source of power of
   * @return Source of redstone power, or null if none
   */
  public static Block getReceivingPowerLocation(Block block) {
    for (BlockFace face : BlockFaces.NESWBT) {
      Block b = block.translate(face);
      if (isEmittingPower(b, face.getOpposite())) {
        return b;
      }
    }
    return null;
  }

  /**
   * Gets if the given block is emitting power to surrounding blocks
   *
   * @param block to check
   * @param to the face it is powering
   * @return True if emitting power, False if not
   */
  public static boolean isEmittingPower(Block block, BlockFace to) {
    return isEmittingPower(block, to, RedstonePowerMode.ALL);
  }

  /**
   * Gets if the given block is emitting power to surrounding blocks
   *
   * @param block to check
   * @param powerMode to use when reading power
   * @return True if emitting power, False if not
   */
  public static boolean isEmittingPower(Block block, RedstonePowerMode powerMode) {
    return isEmittingPower(block, BlockFace.THIS, powerMode);
  }

  /**
   * Gets if the given block is emitting power to surrounding blocks
   *
   * @param block to check
   * @param to the face it is powering
   * @param powerMode to use when reading power
   * @return True if emitting power, False if not
   */
  public static boolean isEmittingPower(Block block, BlockFace to, RedstonePowerMode powerMode) {
    BlockMaterial mat = block.getMaterial();
    if (!(mat instanceof IndirectRedstoneSource)) {
      return false;
    }
    // Powered itself?
    if (to == BlockFace.THIS) {
      return ((IndirectRedstoneSource) mat).hasRedstonePower(block, powerMode);
    }
    // Use direction for direct sources
    if (mat instanceof RedstoneSource && ((RedstoneSource) mat).hasDirectRedstonePower(block, to, powerMode)) {
      return true;
    }
    // Fall-back to indirect redstone sources
    return ((IndirectRedstoneSource) mat).hasIndirectRedstonePower(block, to, powerMode);
  }
}
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