Abstract component method support

annotations/src/main/java/mindustry/annotations/BaseProcessor.java

@@ -1,6 +1,7 @@
 package mindustry.annotations;
 
 import arc.struct.*;
+import arc.util.*;
 import com.squareup.javapoet.*;
 import com.sun.source.util.*;
 import mindustry.annotations.util.*;
@@ -86,10 +87,16 @@ public abstract class BaseProcessor extends AbstractProcessor{
 
     public void err(String message){
         messager.printMessage(Kind.ERROR, message);
+        Log.err("[CODEGEN ERROR] " +message);
     }
 
     public void err(String message, Element elem){
         messager.printMessage(Kind.ERROR, message, elem);
+        Log.err("[CODEGEN ERROR] " + message + ": " + elem);
+    }
+
+    public void err(String message, Selement elem){
+        err(message, elem.e);
     }
 
     @Override

annotations/src/main/java/mindustry/annotations/impl/EntityProcess.java

@@ -137,7 +137,13 @@ public class EntityProcess extends BaseProcessor{
                     //only write the block if it's a void method with several entries
                     boolean writeBlock = first.ret().toString().equals("void") && entry.value.size > 1;
 
+                    if(entry.value.first().is(Modifier.ABSTRACT) && entry.value.size == 1){
+                        err(entry.value.first().up().getSimpleName() + " declares an abstract method. This method must be implemented in another component", entry.value.first());
+                    }
+
                     for(Smethod elem : entry.value){
+                        if(elem.is(Modifier.ABSTRACT)) continue;
+
                         //get all statements in the method, copy them over
                         MethodTree methodTree = elem.tree();
                         BlockTree blockTree = methodTree.getBody();

annotations/src/main/java/mindustry/annotations/util/Smethod.java

@@ -14,6 +14,10 @@ public class Smethod extends Selement<ExecutableElement>{
         super(executableElement);
     }
 
+    public boolean is(Modifier mod){
+        return e.getModifiers().contains(mod);
+    }
+
     public Array<TypeMirror> thrown(){
         return Array.with(e.getThrownTypes()).as(TypeMirror.class);
     }