Implement methods to convert between Component and Brigadier's Message (#5542)

Paper-MojangAPI/src/main/java/io/papermc/paper/brigadier/PaperBrigadier.java

@@ -0,0 +1,42 @@
+package io.papermc.paper.brigadier;
+
+import com.mojang.brigadier.Message;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.ComponentLike;
+import net.kyori.adventure.text.TextComponent;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+/**
+ * Helper methods to bridge the gaps between Brigadier and Paper-MojangAPI.
+ */
+public final class PaperBrigadier {
+    private PaperBrigadier() {
+        throw new RuntimeException("PaperBrigadier is not to be instantiated!");
+    }
+
+    /**
+     * Create a new Brigadier {@link Message} from a {@link ComponentLike}.
+     *
+     * <p>Mostly useful for creating rich suggestion tooltips in combination with other Paper-MojangAPI APIs.</p>
+     *
+     * @param componentLike The {@link ComponentLike} to use for the {@link Message} contents
+     * @return A new Brigadier {@link Message}
+     */
+    public static @NonNull Message message(final @NonNull ComponentLike componentLike) {
+        return PaperBrigadierProvider.instance().message(componentLike);
+    }
+
+    /**
+     * Create a new {@link Component} from a Brigadier {@link Message}.
+     *
+     * <p>If the {@link Message} was created from a {@link Component}, it will simply be
+     * converted back, otherwise a new {@link TextComponent} will be created with the
+     * content of {@link Message#getString()}</p>
+     *
+     * @param message The {@link Message} to create a {@link Component} from
+     * @return The created {@link Component}
+     */
+    public static @NonNull Component componentFromMessage(final @NonNull Message message) {
+        return PaperBrigadierProvider.instance().componentFromMessage(message);
+    }
+}

Paper-MojangAPI/src/main/java/io/papermc/paper/brigadier/PaperBrigadierProvider.java

@@ -0,0 +1,30 @@
+package io.papermc.paper.brigadier;
+
+import com.mojang.brigadier.Message;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.ComponentLike;
+import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import static java.util.Objects.requireNonNull;
+
+interface PaperBrigadierProvider {
+    final class Holder {
+        private static @MonotonicNonNull PaperBrigadierProvider INSTANCE;
+    }
+
+    static @NonNull PaperBrigadierProvider instance() {
+        return requireNonNull(Holder.INSTANCE, "PaperBrigadierProvider has not yet been initialized!");
+    }
+
+    static void initialize(final @NonNull PaperBrigadierProvider instance) {
+        if (Holder.INSTANCE != null) {
+            throw new IllegalStateException("PaperBrigadierProvider has already been initialized!");
+        }
+        Holder.INSTANCE = instance;
+    }
+
+    @NonNull Message message(@NonNull ComponentLike componentLike);
+
+    @NonNull Component componentFromMessage(@NonNull Message message);
+}