SpigotCore_Main/src/de/steamwar/providers/BauSystemProvider.java

@@ -0,0 +1,56 @@
+package de.steamwar.providers;
+
+import de.steamwar.providers.impl.*;
+import org.bukkit.Bukkit;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+public interface BauSystemProvider {
+
+    static <T> T use(Function<BauSystemProvider, T> function, T def) {
+        return BauSystemProviderImplementor.use(function, def);
+    }
+
+    static void use(Consumer<BauSystemProvider> consumer) {
+        BauSystemProviderImplementor.use(consumer);
+    }
+
+    int getOwner();
+
+    class BauSystemProviderImplementor {
+        private BauSystemProviderImplementor() {}
+
+        static boolean hasBausystem;
+        static BauSystemProvider bauSystemProvider;
+
+        static {
+            try {
+                Class.forName("de.steamwar.bausystem.BauSystem");
+                hasBausystem = true;
+                switch (Bukkit.getPluginManager().getPlugin("BauSystem").getDescription().getVersion()) {
+                    case "2.0":
+                        bauSystemProvider = new BauSystem2Provider();
+                        break;
+                    case "1.0":
+                        bauSystemProvider = new BauSystem1Provider();
+                        break;
+                    default:
+                        hasBausystem = false;
+                }
+            } catch (Exception e) {
+                hasBausystem = false;
+            }
+        }
+
+        static <T> T use(Function<BauSystemProvider, T> function, T def) {
+            if(!hasBausystem) return def;
+            return function.apply(bauSystemProvider);
+        }
+
+        static void use(Consumer<BauSystemProvider> consumer) {
+            if(!hasBausystem) return;
+            consumer.accept(bauSystemProvider);
+        }
+    }
+}

SpigotCore_Main/src/de/steamwar/providers/impl/BauSystem1Provider.java

@@ -0,0 +1,28 @@
+package de.steamwar.providers.impl;
+
+import de.steamwar.providers.BauSystemProvider;
+
+import java.lang.reflect.Method;
+
+public class BauSystem1Provider implements BauSystemProvider {
+
+    private static final Method BAUSYSTEM_GET_OWNER_ID;
+
+    static {
+        try {
+            Class<?> bausystem = Class.forName("de.steamwar.bausystem.BauSystem");
+            BAUSYSTEM_GET_OWNER_ID = bausystem.getDeclaredMethod("getOwnerID");
+        } catch (Exception e) {
+            throw new SecurityException(e);
+        }
+    }
+
+    @Override
+    public int getOwner() {
+        try {
+            return (int) BAUSYSTEM_GET_OWNER_ID.invoke(null);
+        } catch (Exception e) {
+            throw new SecurityException(e);
+        }
+    }
+}

SpigotCore_Main/src/de/steamwar/providers/impl/BauSystem2Provider.java

@@ -0,0 +1,31 @@
+package de.steamwar.providers.impl;
+
+import de.steamwar.providers.BauSystemProvider;
+
+import java.lang.reflect.Method;
+
+public class BauSystem2Provider implements BauSystemProvider {
+
+    private static final Method BAU_SERVER_GET_OWNER_ID;
+    private static final Object BAU_SERVER_INSTANCE;
+
+    static {
+        try {
+            Class<?> bauServer = Class.forName("de.steamwar.bausystem.config.BauServer");
+            Method bauServerGet = bauServer.getDeclaredMethod("getInstance");
+            BAU_SERVER_GET_OWNER_ID = bauServer.getMethod("getOwnerID");
+            BAU_SERVER_INSTANCE = bauServerGet.invoke(null);
+        } catch (Exception e) {
+            throw new SecurityException(e);
+        }
+    }
+
+    @Override
+    public int getOwner() {
+        try {
+            return (int) BAU_SERVER_GET_OWNER_ID.invoke(BAU_SERVER_INSTANCE);
+        } catch (Exception e) {
+            throw new SecurityException(e);
+        }
+    }
+}