java - 在 Bukkit 中从原理图中设置 block 数据？

Question

我正在尝试在 bukkit 中加载和粘贴 .schematic 文件(不 Hook MCEdit API)。下面是我用来粘贴原理图的功能/方法。粘贴时，我在粘贴过程中不断收到 NullPointerException。当我记录放置的元素时，我看到草 block 、石头，但看不到我的箱子、箱子里的任何东西或信标(可能更多 block )。

错误发生在这一行:block.setData(blockData[index], true);

我认为这与元数据有关，但我如何从原理图文件中获取该信息并将其应用于每个 block ？

问题:我如何粘贴带有元数据的项目，例如(包含内容的箱子、火把、信标等？

@SuppressWarnings("deprecation")
public void pasteSchematic(World world, Location loc, Schematic schematic)
{
    byte[] blocks = schematic.getBlocks();
    byte[] blockData = schematic.getData();

    short length = schematic.getLenght();
    short width = schematic.getWidth();
    short height = schematic.getHeight();

    for (int x = 0; x < width; ++x) {
        for (int y = 0; y < height; ++y) {
            for (int z = 0; z < length; ++z) {
                int index = y * width * length + z * width + x;
                Block block = new Location(world, x + loc.getX(), y + loc.getY(), z + loc.getZ()).getBlock();
                block.setTypeId(blocks[index], true);
                block.setData(blockData[index], true);
                if(block.getType() == Material.BEACON || block instanceof Beacon) {
                    // Add location up one block
                    getLogger().info("Block is a Beacon!");
                    spawnLocations.add(block.getLocation().add(new Location(block.getWorld(),0,1,0)));
                } else {
                    getLogger().info("Block is a " + block.getType().toString() + " block!");
                }
            }
        }
    }
}

并加载原理图文件:

public Schematic loadSchematic(File file) throws IOException
{
    FileInputStream stream = new FileInputStream(file);
    @SuppressWarnings("resource")
    NBTInputStream nbtStream = new NBTInputStream(stream);

    CompoundTag schematicTag = (CompoundTag) nbtStream.readTag();
    if (!schematicTag.getName().equals("Schematic")) {
        throw new IllegalArgumentException("Tag \"Schematic\" does not exist or is not first");
    }

    Map<String, Tag> schematic = schematicTag.getValue();
    if (!schematic.containsKey("Blocks")) {
        throw new IllegalArgumentException("Schematic file is missing a \"Blocks\" tag");
    }

    short width = getChildTag(schematic, "Width", ShortTag.class).getValue();
    short length = getChildTag(schematic, "Length", ShortTag.class).getValue();
    short height = getChildTag(schematic, "Height", ShortTag.class).getValue();

    String materials = getChildTag(schematic, "Materials", StringTag.class).getValue();
    if (!materials.equals("Alpha")) {
        throw new IllegalArgumentException("Schematic file is not an Alpha schematic");
    }

    byte[] blocks = getChildTag(schematic, "Blocks", ByteArrayTag.class).getValue();
    byte[] blockData = getChildTag(schematic, "Data", ByteArrayTag.class).getValue();
    return new Schematic(blocks, blockData, width, length, height);
}

/**
* Get child tag of a NBT structure.
*
* @param items The parent tag map
* @param key The name of the tag to get
* @param expected The expected type of the tag
* @return child tag casted to the expected type
* @throws DataException if the tag does not exist or the tag is not of the
* expected type
*/
private static <T extends Tag> T getChildTag(Map<String, Tag> items, String key, Class<T> expected) throws IllegalArgumentException
{
    if (!items.containsKey(key)) {
        throw new IllegalArgumentException("Schematic file is missing a \"" + key + "\" tag");
    }
    Tag tag = items.get(key);
    if (!expected.isInstance(tag)) {
        throw new IllegalArgumentException(key + " tag is not of tag type " + expected.getName());
    }
    return expected.cast(tag);
}

更新经过进一步测试，即使我移除了箱子和信标(只是草和石头)，错误仍然存​​在。如果有帮助，我将此事件称为 onSignChange。

控制台报错如下:

[21:34:22 ERROR]: Could not pass event SignChangeEvent to SkyWars v1.0.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:294) ~[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:501) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:486) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java
:1586) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInUpdateSign.a(SourceFile:48)
[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInUpdateSign.handle(SourceFile
:9) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157
) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [serv
er.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:6
67) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:2
60) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:5
58) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:469) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
Caused by: java.lang.NullPointerException
        at org.bukkit.craftbukkit.v1_7_R3.util.CraftMagicNumbers.getBlock(CraftM
agicNumbers.java:80) ~[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at org.bukkit.craftbukkit.v1_7_R3.util.CraftMagicNumbers.getBlock(CraftM
agicNumbers.java:36) ~[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at org.bukkit.craftbukkit.v1_7_R3.block.CraftBlock.getNMSBlock(CraftBloc
k.java:55) ~[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at org.bukkit.craftbukkit.v1_7_R3.block.CraftBlock.setTypeIdAndData(Craf
tBlock.java:129) ~[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at org.bukkit.craftbukkit.v1_7_R3.block.CraftBlock.setTypeId(CraftBlock.
java:124) ~[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        at com.FeaRCode.SkyWars.SkyWars.pasteSchematic(SkyWars.java:132) ~[?:?]
        at com.FeaRCode.SkyWars.GameEvents.OnSignChange(GameEvents.java:33) ~[?:
?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
_05]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0
_05]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_05]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_05]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) ~[server.jar:git-Bukkit-1.7.9-R0.1-6-g4d832c3-b3090jnks]
        ... 13 more

skywars 中的第 132 行是这样的:block.setData(blockData[index], true);GameEvents 中的行是我调用此方法的时间。

更新 2这是一些 API 用法的代码

public void pasteSchematic(World world, Location loc)
{
    File schematic = new File(this.getDataFolder() + File.separator + fileName);
    Location topLeft;
    Location bottomRight;
    Vector v = new Vector(loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
    BukkitWorld BWf = new BukkitWorld(currentWorld);
    EditSession es = new EditSession(BWf, -1);
    try {
        CuboidClipboard cc = SchematicFormat.getFormat(schematic).load(schematic);
        try {
            cc.paste(es, v, true);
            topLeft = new Location(currentWorld, loc.getBlockX() + cc.getWidth(), loc.getBlockY() + cc.getHeight(), loc.getBlockZ() + cc.getLength());
            bottomRight = new Location(currentWorld, loc.getBlockX() - cc.getWidth(), loc.getBlockY() - cc.getHeight(), loc.getBlockZ() - cc.getLength());
            calculateSpawnLocations(topLeft, bottomRight);
        } catch (MaxChangedBlocksException e) {
        e.printStackTrace();
        }
    } catch (IOException e) {
        e.printStackTrace();
    } catch (DataException e) {
        e.printStackTrace();
    }

}

public void calculateSpawnLocations(Location loc1, Location loc2)
{
    int topBlockX = (loc1.getBlockX() < loc2.getBlockX() ? loc2.getBlockX() : loc1.getBlockX());
    int bottomBlockX = (loc1.getBlockX() > loc2.getBlockX() ? loc2.getBlockX() : loc1.getBlockX());

    int topBlockY = (loc1.getBlockY() < loc2.getBlockY() ? loc2.getBlockY() : loc1.getBlockY());
    int bottomBlockY = (loc1.getBlockY() > loc2.getBlockY() ? loc2.getBlockY() : loc1.getBlockY());

    int topBlockZ = (loc1.getBlockZ() < loc2.getBlockZ() ? loc2.getBlockZ() : loc1.getBlockZ());
    int bottomBlockZ = (loc1.getBlockZ() > loc2.getBlockZ() ? loc2.getBlockZ() : loc1.getBlockZ());

    for(int x = bottomBlockX; x <= topBlockX; x++)
    {
        for(int z = bottomBlockZ; z <= topBlockZ; z++)
        {
            for(int y = bottomBlockY; y <= topBlockY; y++)
            {
                Block block = loc1.getWorld().getBlockAt(x, y, z);
                if(block instanceof Beacon || block.getType() == Material.BEACON || block.getType().equals(Material.BEACON)) {
                    // Add location up one block
                    getLogger().info("Block is a Beacon!");
                    spawnLocations.add(block.getLocation().add(new Location(block.getWorld(),0,1,0)));
                } else {
                    getLogger().info("Block is a " + block.getType().toString() + " block!");
                }
            }
        }
    }
}

Answer 1

我这样做没有使用任何其他外部导入，甚至没有jnbt，它现在默认包含在我的世界中，通过做这样的事情:

public class Schematic{

 public List<Location> pasteSchematic(File f){  
  try{
   FileInputStream fis = new FileInputStream(f);
   NBTTagCompound nbt = NBTCompressedStreamTools.a(fis);

   short width = nbt.getShort("Width");
   short height = nbt.getShort("Height");
   short length = nbt.getShort("Length");

   byte[] blocks = nbt.getByteArray("Blocks");
   byte[] data = nbt.getByteArray("Data");

   fis.close();


   List<Location> locations = new ArrayList<Location>();
   //paste
   for(int x = 0; x < this.width; ++x){
    for(int y = 0; y < this.height; ++y){
     for(int z = 0; z < this.length; ++z){
      int index = y * this.width * this.length + z * this.width + x;
      final Location l = new Location(loc.getWorld(), x + loc.getX(), y + loc.getY(), z + loc.getZ());
      int b = this.blocks[index] & 0xFF;//make the block unsigned, so that blocks with an id over 127, like quartz and emerald, can be pasted
      final Block block = l.getBlock();
      block.setType(Material.getMaterial(b));
      block.setData(this.data[index]);

      Material m = Material.getMaterial(b);
      //you can check what type the block is here, like if(m.equals(Material.BEACON)) to check if it's a beacon        

      locations.add(l);
     }
    }
   }
  }
  catch(Exception e){e.printStackTrace();}
 }
 return locations;
}

现在您可以在放置所有 block 后迭代 pasteSchematic 返回的 List。方法如下:

List<Location> locationss = pasteSchematic(mySchematicFile);
for(Location loc : locations){
 if(loc.getBlock().getType().equals(Material.BEACON)){
  //a beacon was plasted at the loc
 }
}