feat: add server (#1)

Author: Snabeldier

src/main/java/themeparkcraft.core.api/Core.java

@@ -1,7 +1,34 @@
 package themeparkcraft.core.api;
 
+import org.bukkit.plugin.java.JavaPlugin;
+import themeparkcraft.core.api.server.Server;
+
+import javax.annotation.Nonnull;
+
 @SuppressWarnings({"unused", "UnusedReturnValue"})
 public final class Core {
 
+    private static CoreServer server;
+
+    /**
+     * Get the JavaPlugin instance of CorePlugin.
+     * <br>
+     * This gives you access to some Bukkit features that rely on this instance.
+     *
+     * @return JavaPlugin instance of CorePlugin
+     */
+    @Nonnull
+    public static JavaPlugin getInstance() {
+        return server.getInstance();
+    }
 
+    /**
+     * Get the {@link Server} object, granting access to all server-related features.
+     *
+     * @return Server object
+     */
+    @Nonnull
+    public static Server server() {
+        return server.server();
+    }
 }

src/main/java/themeparkcraft.core.api/CoreServer.java

@@ -1,7 +1,17 @@
 package themeparkcraft.core.api;
 
+import org.bukkit.plugin.java.JavaPlugin;
 import org.jetbrains.annotations.ApiStatus;
+import themeparkcraft.core.api.server.Server;
+
+import javax.annotation.Nonnull;
 
 @ApiStatus.Internal
 public interface CoreServer {
+
+    @Nonnull
+    JavaPlugin getInstance();
+
+    @Nonnull
+    Server server();
 }

src/main/java/themeparkcraft.core.api/server/Server.java

@@ -0,0 +1,27 @@
+package themeparkcraft.core.api.server;
+
+import javax.annotation.Nonnull;
+
+@SuppressWarnings("unused")
+public interface Server {
+
+    /**
+     * Get the server type.
+     *
+     * @return the server type
+     */
+    @Nonnull
+    ServerType type();
+
+    /**
+     * Gets whether the server is fully started.
+     *
+     * @return true, if the server is fully started
+     */
+    boolean isFullyStarted();
+
+    /**
+     * Restarts the server.
+     */
+    void restart();
+}