Fix mixin crash

src/main/java/org/embeddedt/modernfix/mixin/perf/dynamic_resources/ItemModelShaperMixin.java

@@ -9,6 +9,7 @@ import net.minecraftforge.client.ItemModelMesherForge;
 import net.minecraftforge.registries.ForgeRegistries;
 import net.minecraftforge.registries.IRegistryDelegate;
 import org.embeddedt.modernfix.dynamicresources.ModelLocationCache;
+import org.embeddedt.modernfix.util.ItemMesherMap;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.spongepowered.asm.mixin.*;
@@ -37,71 +38,7 @@ public abstract class ItemModelShaperMixin extends ItemModelShaper {
     private void replaceLocationMap(CallbackInfo ci) {
         overrideLocations = new HashMap<>();
         // need to replace this map because mods query locations through it
-        locations = new Map<IRegistryDelegate<Item>, ModelResourceLocation>() {
+        locations = new ItemMesherMap(this::getLocation);
-            @Override
-            public int size() {
-                return ForgeRegistries.ITEMS.getValues().size();
-            }
-
-            @Override
-            public boolean isEmpty() {
-                return false;
-            }
-
-            @Override
-            public boolean containsKey(Object key) {
-                return true;
-            }
-
-            @Override
-            public boolean containsValue(Object value) {
-                return false;
-            }
-
-            @Override
-            public ModelResourceLocation get(Object key) {
-                return getLocation(((IRegistryDelegate<Item>)key).get());
-            }
-
-            @Nullable
-            @Override
-            public ModelResourceLocation put(IRegistryDelegate<Item> key, ModelResourceLocation value) {
-                throw new UnsupportedOperationException();
-            }
-
-            @Override
-            public ModelResourceLocation remove(Object key) {
-                throw new UnsupportedOperationException();
-            }
-
-            @Override
-            public void putAll(@NotNull Map<? extends IRegistryDelegate<Item>, ? extends ModelResourceLocation> m) {
-                throw new UnsupportedOperationException();
-            }
-
-            @Override
-            public void clear() {
-                throw new UnsupportedOperationException();
-            }
-
-            @NotNull
-            @Override
-            public Set<IRegistryDelegate<Item>> keySet() {
-                throw new UnsupportedOperationException();
-            }
-
-            @NotNull
-            @Override
-            public Collection<ModelResourceLocation> values() {
-                throw new UnsupportedOperationException();
-            }
-
-            @NotNull
-            @Override
-            public Set<Entry<IRegistryDelegate<Item>, ModelResourceLocation>> entrySet() {
-                throw new UnsupportedOperationException();
-            }
-        };
     }
 
     private ModelResourceLocation getLocation(Item item) {

src/main/java/org/embeddedt/modernfix/util/ItemMesherMap.java

@@ -0,0 +1,85 @@
+package org.embeddedt.modernfix.util;
+
+import net.minecraft.client.resources.model.ModelResourceLocation;
+import net.minecraft.world.item.Item;
+import net.minecraftforge.registries.ForgeRegistries;
+import net.minecraftforge.registries.IRegistryDelegate;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.Function;
+
+public class ItemMesherMap implements Map<IRegistryDelegate<Item>, ModelResourceLocation> {
+    private final Function<Item, ModelResourceLocation> getLocation;
+
+    public ItemMesherMap(Function<Item, ModelResourceLocation> getLocation) {
+        this.getLocation = getLocation;
+    }
+
+    @Override
+    public int size() {
+        return ForgeRegistries.ITEMS.getValues().size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return false;
+    }
+
+    @Override
+    public boolean containsKey(Object key) {
+        return true;
+    }
+
+    @Override
+    public boolean containsValue(Object value) {
+        return false;
+    }
+
+    @Override
+    public ModelResourceLocation get(Object key) {
+        return getLocation.apply(((IRegistryDelegate<Item>)key).get());
+    }
+
+    @Nullable
+    @Override
+    public ModelResourceLocation put(IRegistryDelegate<Item> key, ModelResourceLocation value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public ModelResourceLocation remove(Object key) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void putAll(@NotNull Map<? extends IRegistryDelegate<Item>, ? extends ModelResourceLocation> m) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException();
+    }
+
+    @NotNull
+    @Override
+    public Set<IRegistryDelegate<Item>> keySet() {
+        throw new UnsupportedOperationException();
+    }
+
+    @NotNull
+    @Override
+    public Collection<ModelResourceLocation> values() {
+        throw new UnsupportedOperationException();
+    }
+
+    @NotNull
+    @Override
+    public Set<Map.Entry<IRegistryDelegate<Item>, ModelResourceLocation>> entrySet() {
+        throw new UnsupportedOperationException();
+    }
+}