版本更新至：3.76
调整：开发框架改为 Gradle 新增：Language2 工具新增 [book] 类型
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package me.skymc.taboolib.bookformatter;
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import lombok.Getter;
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import net.md_5.bungee.api.chat.BaseComponent;
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import net.md_5.bungee.api.chat.TextComponent;
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import net.md_5.bungee.chat.ComponentSerializer;
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import org.bukkit.Bukkit;
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import org.bukkit.entity.Player;
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import org.bukkit.inventory.ItemStack;
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import org.bukkit.inventory.meta.BookMeta;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.List;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* The NMS helper for all the Book-API
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*/
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public final class BookReflection {
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private static final String version;
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private static final boolean doubleHands;
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private static final Class<?> craftMetaBookClass;
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private static final Field craftMetaBookField;
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private static final Method chatSerializerA;
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private static final Method craftPlayerGetHandle;
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//This method takes an enum that represents the player's hand only in versions >= 1.9
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//In the other versions it only takes the nms item
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private static final Method entityPlayerOpenBook;
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//only version >= 1.9
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private static final Object[] hands;
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//Older versions
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/*private static final Field entityHumanPlayerConnection;
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private static final Method playerConnectionSendPacket;
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private static final Constructor<?> packetPlayOutCustomPayloadConstructor;
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private static final Constructor<?> packetDataSerializerConstructor;*/
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private static final Method nmsItemStackSave;
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private static final Constructor<?> nbtTagCompoundConstructor;
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private static final Method craftItemStackAsNMSCopy;
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static {
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version = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];
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final int major, minor;
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Pattern pattern = Pattern.compile("v([0-9]+)_([0-9]+)");
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Matcher m = pattern.matcher(version);
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if(m.find()) {
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major = Integer.parseInt(m.group(1));
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minor = Integer.parseInt(m.group(2));
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} else {
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throw new IllegalStateException("Cannot parse version \"" + version + "\", make sure it follows \"v<major>_<minor>...\"");
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}
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doubleHands = major <= 1 && minor >= 9;
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try {
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craftMetaBookClass = getCraftClass("inventory.CraftMetaBook");
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craftMetaBookField = craftMetaBookClass.getDeclaredField("pages");
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craftMetaBookField.setAccessible(true);
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Class<?> chatSerializer = getNmsClass("IChatBaseComponent$ChatSerializer", false);
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if(chatSerializer == null)
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chatSerializer = getNmsClass("ChatSerializer");
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chatSerializerA = chatSerializer.getDeclaredMethod("a", String.class);
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final Class<?> craftPlayerClass = getCraftClass("entity.CraftPlayer");
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craftPlayerGetHandle = craftPlayerClass.getMethod("getHandle");
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final Class<?> entityPlayerClass = getNmsClass("EntityPlayer");
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final Class<?> itemStackClass = getNmsClass("ItemStack");
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if(doubleHands) {
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final Class<?> enumHandClass = getNmsClass("EnumHand");
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entityPlayerOpenBook = entityPlayerClass.getMethod("a", itemStackClass, enumHandClass);
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hands = enumHandClass.getEnumConstants();
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} else {
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entityPlayerOpenBook = entityPlayerClass.getMethod("openBook", itemStackClass);
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hands = null;
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}
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//Older versions
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/*entityHumanPlayerConnection = entityPlayerClass.getField("playerConnection");
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final Class<?> playerConnectionClass = getNmsClass("PlayerConnection");
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playerConnectionSendPacket = playerConnectionClass.getMethod("sendPacket", getNmsClass("Packet"));
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final Class<?> packetDataSerializerClasss = getNmsClass("PacketDataSerializer");
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packetPlayOutCustomPayloadConstructor = getNmsClass("PacketPlayOutCustomPayload").getConstructor(String.class, packetDataSerializerClasss);
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packetDataSerializerConstructor = packetDataSerializerClasss.getConstructor(ByteBuf.class);*/
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final Class<?> craftItemStackClass = getCraftClass("inventory.CraftItemStack");
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craftItemStackAsNMSCopy = craftItemStackClass.getMethod("asNMSCopy", ItemStack.class);
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Class<?> nmsItemStackClazz = getNmsClass("ItemStack");
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Class<?> nbtTagCompoundClazz = getNmsClass("NBTTagCompound");
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nmsItemStackSave = nmsItemStackClazz.getMethod("save", nbtTagCompoundClazz);
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nbtTagCompoundConstructor = nbtTagCompoundClazz.getConstructor();
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} catch (Exception e) {
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throw new IllegalStateException("Cannot initiate reflections for " + version, e);
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}
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}
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/**
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* Sets the pages of the book to the components json equivalent
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* @param meta the book meta to change
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* @param components the pages of the book
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*/
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@SuppressWarnings("unchecked")//reflections = unchecked warnings
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public static void setPages(BookMeta meta, BaseComponent[][] components) {
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try {
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List<Object> pages = (List<Object>) craftMetaBookField.get(meta);
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pages.clear();
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for(BaseComponent[] c : components) {
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final String json = ComponentSerializer.toString(c);
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//System.out.println("page:" + json); //Debug
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pages.add(chatSerializerA.invoke(null, json));
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}
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} catch (Exception e) {
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throw new UnsupportedVersionException(e);
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}
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}
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/**
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* Append the pages of the book to the components json equivalent
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* @param meta the book meta to change
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* @param components the pages of the book
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*/
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@SuppressWarnings("unchecked")//reflections = unchecked warnings
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public static void addPages(BookMeta meta, BaseComponent[][] components) {
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try {
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List<Object> pages = (List<Object>) craftMetaBookField.get(meta);
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for(BaseComponent[] c : components) {
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final String json = ComponentSerializer.toString(c);
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//System.out.println("page:" + json); //Debug
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pages.add(chatSerializerA.invoke(null, json));
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}
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} catch (Exception e) {
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throw new UnsupportedVersionException(e);
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}
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}
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/**
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* Opens the book to a player (the player needs to have the book in one of his hands)
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* @param player the player
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* @param book the book to open
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* @param offHand false if the book is in the right hand, true otherwise
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*/
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public static void openBook(Player player, ItemStack book, boolean offHand) {
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//nms(player).openBook(nms(player), nms(book), hand);
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try {
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//Older versions:
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/*playerConnectionSendPacket.invoke(
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entityHumanPlayerConnection.get(toNms(player)),
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createBookOpenPacket()
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);*/
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if(doubleHands) {
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entityPlayerOpenBook.invoke(
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toNms(player),
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nmsCopy(book),
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hands[offHand ? 1 : 0]
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);
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} else {
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entityPlayerOpenBook.invoke(
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toNms(player),
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nmsCopy(book)
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);
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}
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} catch (Exception e) {
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throw new UnsupportedVersionException(e);
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}
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}
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//Older versions
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/*public static Object createBookOpenPacket() {
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//new PacketPlayOutCustomPayload("MC|BOpen", new PacketDataSerializer(Unpooled.buffer())));
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try {
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return packetPlayOutCustomPayloadConstructor.newInstance(
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"MC|BOpen",
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packetDataSerializerConstructor.newInstance(Unpooled.buffer())
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);
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} catch (Exception e) {
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throw new UnsupportedVersionException(e);
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}
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}*/
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/**
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* Translates an ItemStack to his Chat-Component equivalent
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* @param item the item to be converted
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* @return a Chat-Component equivalent of the parameter
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*/
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public static BaseComponent[] itemToComponents(ItemStack item) {
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return jsonToComponents(itemToJson(item));
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}
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/**
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* Translates a json string to his Chat-Component equivalent
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* @param json the json string to be converted
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* @return a Chat-Component equivalent of the parameter
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*/
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public static BaseComponent[] jsonToComponents(String json) {
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return new BaseComponent[] { new TextComponent(json) };
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}
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/**
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* Translates an ItemStack to his json equivalent
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* @param item the item to be converted
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* @return a json equivalent of the parameter
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*/
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private static String itemToJson(ItemStack item) {
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try {
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//net.minecraft.server.ItemStack nmsItemStack = CraftItemStack.asNMSCopy(itemStack);
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Object nmsItemStack = nmsCopy(item);
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//net.minecraft.server.NBTTagCompound compound = new NBTTagCompound();
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//compound = nmsItemStack.save(compound);
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Object emptyTag = nbtTagCompoundConstructor.newInstance();
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Object json = nmsItemStackSave.invoke(nmsItemStack, emptyTag);
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return json.toString();
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} catch (Exception e) {
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throw new UnsupportedVersionException(e);
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}
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}
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/**
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* An error thrown when this NMS-helper class doesn't support the running MC version
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*/
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public static class UnsupportedVersionException extends RuntimeException {
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/**
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* serialVersionUID
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*/
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private static final long serialVersionUID = 6835583513394319946L;
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/**
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* The current running version
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*/
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@Getter
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private final String version = BookReflection.version;
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public UnsupportedVersionException(Exception e) {
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super("Error while executing reflections, submit to developers the following log (version: " + BookReflection.version + ")", e);
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}
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}
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/**
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* Gets the EntityPlayer handled by the argument
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* @param player the Player handler
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* @return the handled class
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* @throws InvocationTargetException when some problems are found with the reflection
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* @throws IllegalAccessException when some problems are found with the reflection
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*/
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public static Object toNms(Player player) throws InvocationTargetException, IllegalAccessException {
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return craftPlayerGetHandle.invoke(player);
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}
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/**
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* Creates a NMS copy of the parameter
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* @param item the ItemStack to be nms-copied
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* @return a NMS-ItemStack that is the equivalent of the one passed as argument
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* @throws InvocationTargetException when some problems are found with the reflection
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* @throws IllegalAccessException when some problems are found with the reflection
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*/
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public static Object nmsCopy(ItemStack item) throws InvocationTargetException, IllegalAccessException {
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return craftItemStackAsNMSCopy.invoke(null, item);
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}
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public static Class<?> getNmsClass(String className, boolean log) {
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try {
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return Class.forName("net.minecraft.server." + version + "." + className);
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} catch(ClassNotFoundException e) {
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if(log)
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e.printStackTrace();
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return null;
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}
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}
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public static Class<?> getNmsClass(String className) {
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return getNmsClass(className, true);
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}
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private static Class<?> getCraftClass(String path) {
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try {
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return Class.forName("org.bukkit.craftbukkit." + version + "." + path);
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} catch(ClassNotFoundException e) {
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e.printStackTrace();
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return null;
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}
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}
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}
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