Add MaxVersion

src/de/steamwar/linkage/LinkageProcessor.java

@@ -37,6 +37,7 @@ import javax.lang.model.type.TypeMirror;
 import javax.tools.Diagnostic;
 import java.io.*;
 import java.io.Writer;
+import java.lang.annotation.Annotation;
 import java.util.*;
 import java.util.function.Consumer;
 import java.util.stream.Collectors;
@@ -289,17 +290,25 @@ public class LinkageProcessor extends AbstractProcessor {
     }
 
     private void specialElements(TypeElement typeElement, BuildPlan buildPlan, Consumer<String> stringConsumer, Runnable inner) {
+        MinVersion minVersion = typeElement.getAnnotation(MinVersion.class);
+        MaxVersion maxVersion = typeElement.getAnnotation(MaxVersion.class);
+        EventMode eventMode = typeElement.getAnnotation(EventMode.class);
+        DiscordMode discordMode = typeElement.getAnnotation(DiscordMode.class);
         if (context == LinkageType.Context.SPIGOT) {
-            MinVersion minVersion = typeElement.getAnnotation(MinVersion.class);
+            errorOnNonNull(typeElement, eventMode, discordMode);
             if (minVersion != null) {
                 buildPlan.addImport("de.steamwar.core.Core");
                 stringConsumer.accept("if (Core.getVersion() >= " + minVersion.value() + ") {");
             }
+            if (maxVersion != null) {
+                buildPlan.addImport("de.steamwar.core.Core");
+                stringConsumer.accept("if (Core.getVersion() < " + maxVersion.value() + ") {");
+            }
             inner.run();
+            if (maxVersion != null) stringConsumer.accept("}");
             if (minVersion != null) stringConsumer.accept("}");
         } else {
-            EventMode eventMode = typeElement.getAnnotation(EventMode.class);
-            DiscordMode discordMode = typeElement.getAnnotation(DiscordMode.class);
+            errorOnNonNull(typeElement, minVersion, maxVersion);
             if (eventMode != null) {
                 buildPlan.addImport("de.steamwar.bungeecore.BungeeCore");
                 stringConsumer.accept("if (" + eventMode.value().getPrefix() + "BungeeCore.EVENT_MODE) {");
@@ -313,4 +322,12 @@ public class LinkageProcessor extends AbstractProcessor {
             if (eventMode != null) stringConsumer.accept("}");
         }
     }
+
+    private void errorOnNonNull(TypeElement typeElement, Annotation... annotations) {
+        for (Annotation annotation : annotations) {
+            if (annotation != null) {
+                messager.printMessage(Diagnostic.Kind.ERROR, annotation.annotationType().getSimpleName() + " is not supported in " + context.name(), typeElement);
+            }
+        }
+    }
 }

src/de/steamwar/linkage/MaxVersion.java

@@ -0,0 +1,32 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2022  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.linkage;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@AllowedContexts(LinkageType.Context.SPIGOT)
+@Retention(RetentionPolicy.SOURCE)
+@Target({ElementType.TYPE})
+public @interface MaxVersion {
+    int value();
+}