Brigadier based command API

== AT ==
public net.minecraft.commands.arguments.blocks.BlockInput tag
public net.minecraft.commands.arguments.DimensionArgument ERROR_INVALID_VALUE
public net.minecraft.server.ReloadableServerResources registryLookup
public net.minecraft.server.ReloadableServerResources

Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
Co-authored-by: Marc Baloup <marc.baloup@laposte.net>

paper-server/src/main/java/io/papermc/paper/brigadier/NullCommandSender.java

@@ -0,0 +1,151 @@
+package io.papermc.paper.brigadier;
+
+import java.util.Set;
+import java.util.UUID;
+import net.kyori.adventure.text.Component;
+import net.md_5.bungee.api.chat.BaseComponent;
+import org.bukkit.Bukkit;
+import org.bukkit.Server;
+import org.bukkit.command.CommandSender;
+import org.bukkit.permissions.PermissibleBase;
+import org.bukkit.permissions.Permission;
+import org.bukkit.permissions.PermissionAttachment;
+import org.bukkit.permissions.PermissionAttachmentInfo;
+import org.bukkit.plugin.Plugin;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+@DefaultQualifier(NonNull.class)
+public final class NullCommandSender implements CommandSender {
+
+    public static final CommandSender INSTANCE = new NullCommandSender();
+
+    private NullCommandSender() {
+    }
+
+    @Override
+    public void sendMessage(final String message) {
+    }
+
+    @Override
+    public void sendMessage(final String... messages) {
+    }
+
+    @Override
+    public void sendMessage(@Nullable final UUID sender, final String message) {
+    }
+
+    @Override
+    public void sendMessage(@Nullable final UUID sender, final String... messages) {
+    }
+
+    @SuppressWarnings("ConstantValue")
+    @Override
+    public Server getServer() {
+        final @Nullable Server server = Bukkit.getServer();
+        if (server == null) {
+            throw new UnsupportedOperationException("The server has not been created yet, you cannot access it at this time from the 'null' CommandSender");
+        }
+        return server;
+    }
+
+    @Override
+    public String getName() {
+        return "";
+    }
+
+    private final Spigot spigot = new Spigot();
+    @Override
+    public Spigot spigot() {
+        return this.spigot;
+    }
+
+    public final class Spigot extends CommandSender.Spigot {
+
+        @Override
+        public void sendMessage(@NotNull final BaseComponent component) {
+        }
+
+        @Override
+        public void sendMessage(@NonNull final @NotNull BaseComponent... components) {
+        }
+
+        @Override
+        public void sendMessage(@Nullable final UUID sender, @NotNull final BaseComponent component) {
+        }
+
+        @Override
+        public void sendMessage(@Nullable final UUID sender, @NonNull final @NotNull BaseComponent... components) {
+        }
+    }
+
+    @Override
+    public Component name() {
+        return Component.empty();
+    }
+
+    @Override
+    public boolean isPermissionSet(final String name) {
+        return false;
+    }
+
+    @Override
+    public boolean isPermissionSet(final Permission perm) {
+        return false;
+    }
+
+    @Override
+    public boolean hasPermission(final String name) {
+        return true;
+    }
+
+    @Override
+    public boolean hasPermission(final Permission perm) {
+        return true;
+    }
+
+    @Override
+    public PermissionAttachment addAttachment(final Plugin plugin, final String name, final boolean value) {
+        throw new UnsupportedOperationException("Cannot add attachments to the 'null' CommandSender");
+    }
+
+    @Override
+    public PermissionAttachment addAttachment(final Plugin plugin) {
+        throw new UnsupportedOperationException("Cannot add attachments to the 'null' CommandSender");
+    }
+
+    @Override
+    public @Nullable PermissionAttachment addAttachment(final Plugin plugin, final String name, final boolean value, final int ticks) {
+        throw new UnsupportedOperationException("Cannot add attachments to the 'null' CommandSender");
+    }
+
+    @Override
+    public @Nullable PermissionAttachment addAttachment(final Plugin plugin, final int ticks) {
+        throw new UnsupportedOperationException("Cannot add attachments to the 'null' CommandSender");
+    }
+
+    @Override
+    public void removeAttachment(final PermissionAttachment attachment) {
+        throw new UnsupportedOperationException("Cannot add attachments to the 'null' CommandSender");
+    }
+
+    @Override
+    public void recalculatePermissions() {
+    }
+
+    @Override
+    public Set<PermissionAttachmentInfo> getEffectivePermissions() {
+        throw new UnsupportedOperationException("Cannot remove attachments from the 'null' CommandSender");
+    }
+
+    @Override
+    public boolean isOp() {
+        return true;
+    }
+
+    @Override
+    public void setOp(final boolean value) {
+    }
+}

paper-server/src/main/java/io/papermc/paper/brigadier/PaperBrigadierProviderImpl.java

@@ -1,30 +0,0 @@
-package io.papermc.paper.brigadier;
-
-import com.mojang.brigadier.Message;
-import io.papermc.paper.adventure.PaperAdventure;
-import net.kyori.adventure.text.Component;
-import net.kyori.adventure.text.ComponentLike;
-import net.minecraft.network.chat.ComponentUtils;
-import org.checkerframework.checker.nullness.qual.NonNull;
-
-import static java.util.Objects.requireNonNull;
-
-public enum PaperBrigadierProviderImpl implements PaperBrigadierProvider {
-    INSTANCE;
-
-    PaperBrigadierProviderImpl() {
-        PaperBrigadierProvider.initialize(this);
-    }
-
-    @Override
-    public @NonNull Message message(final @NonNull ComponentLike componentLike) {
-        requireNonNull(componentLike, "componentLike");
-        return PaperAdventure.asVanilla(componentLike.asComponent());
-    }
-
-    @Override
-    public @NonNull Component componentFromMessage(final @NonNull Message message) {
-        requireNonNull(message, "message");
-        return PaperAdventure.asAdventure(ComponentUtils.fromMessage(message));
-    }
-}