Better null checks

core/src/io/anuke/mindustry/mod/ContentParser.java

@@ -79,6 +79,12 @@ public class ContentParser{
     private Json parser = new Json(){
         @Override
         public <T> T readValue(Class<T> type, Class elementType, JsonValue jsonData, Class keyType){
+            T t = internalRead(type, elementType, jsonData, keyType);
+            if(t != null) checkNullFields(t);
+            return t;
+        }
+
+        private <T> T  internalRead(Class<T> type, Class elementType, JsonValue jsonData, Class keyType){
             if(type != null){
                 if(classParsers.containsKey(type)){
                     try{
@@ -295,7 +301,6 @@ public class ContentParser{
             c.sourceFile = file;
             c.mod = mod;
         }
-        checkNulls(c);
         return c;
     }
 
@@ -351,35 +356,21 @@ public class ContentParser{
 
     private Object fieldOpt(Class<?> type, JsonValue value){
         try{
-            Object b = type.getField(value.asString()).get(null);
-            if(b == null) return null;
-            return b;
+            return type.getField(value.asString()).get(null);
         }catch(Exception e){
             return null;
         }
     }
 
-    /** Checks all @NonNull fields in this object, recursively.
-     * Throws an exception if any are null.*/
-    private void checkNulls(Object object){
-        checkNulls(object, new ObjectSet<>());
-    }
-
-    private void checkNulls(Object object, ObjectSet<Object> checked){
-        checked.add(object);
+    private void checkNullFields(Object object){
+        if(object instanceof Number || object instanceof String) return;
 
         parser.getFields(object.getClass()).values().toArray().each(field -> {
             try{
                 if(field.field.getType().isPrimitive()) return;
 
-                Object obj = field.field.get(object);
                 if(field.field.isAnnotationPresent(NonNull.class) && field.field.get(object) == null){
-                    throw new RuntimeException("Field '" + field.field.getName() + "' in " + object.getClass().getSimpleName() + " is missing!");
-                }
-
-                if(obj != null && !checked.contains(obj)){
-                    checkNulls(obj, checked);
-                    checked.add(obj);
+                    throw new RuntimeException("'" + field.field.getName() + "' in " + object.getClass().getSimpleName() + " is missing!");
                 }
             }catch(Exception e){
                 throw new RuntimeException(e);

core/src/io/anuke/mindustry/world/consumers/ConsumeItemFilter.java

@@ -3,6 +3,7 @@ package io.anuke.mindustry.world.consumers;
 import io.anuke.arc.collection.*;
 import io.anuke.arc.function.*;
 import io.anuke.arc.scene.ui.layout.*;
+import io.anuke.arc.util.ArcAnnotate.*;
 import io.anuke.mindustry.entities.type.*;
 import io.anuke.mindustry.game.*;
 import io.anuke.mindustry.type.*;
@@ -14,7 +15,7 @@ import io.anuke.mindustry.world.meta.values.*;
 import static io.anuke.mindustry.Vars.*;
 
 public class ConsumeItemFilter extends Consume{
-    public final Predicate<Item> filter;
+    public final @NonNull Predicate<Item> filter;
 
     public ConsumeItemFilter(Predicate<Item> item){
         this.filter = item;

core/src/io/anuke/mindustry/world/consumers/ConsumeLiquid.java

@@ -2,6 +2,7 @@ package io.anuke.mindustry.world.consumers;
 
 import io.anuke.arc.collection.*;
 import io.anuke.arc.scene.ui.layout.*;
+import io.anuke.arc.util.ArcAnnotate.*;
 import io.anuke.mindustry.entities.type.*;
 import io.anuke.mindustry.game.*;
 import io.anuke.mindustry.type.*;
@@ -10,7 +11,7 @@ import io.anuke.mindustry.world.*;
 import io.anuke.mindustry.world.meta.*;
 
 public class ConsumeLiquid extends ConsumeLiquidBase{
-    public final Liquid liquid;
+    public final @NonNull Liquid liquid;
 
     public ConsumeLiquid(Liquid liquid, float amount){
         super(amount);