Optimize ingredient positions index

This improves performance with Integrated Tunnels and Terminals.

src/main/java/org/cyclops/integrateddynamics/core/network/IngredientPositionsIndex.java

@@ -9,6 +9,7 @@
 import org.cyclops.cyclopscore.ingredient.collection.IIngredientMapMutable;
 import org.cyclops.cyclopscore.ingredient.collection.IngredientCollectionHelpers;
 import org.cyclops.cyclopscore.ingredient.collection.IngredientHashMap;
+import org.cyclops.cyclopscore.ingredient.collection.IngredientMapSingleClassified;
 import org.cyclops.integrateddynamics.api.ingredient.IIngredientPositionsIndex;
 import org.cyclops.integrateddynamics.api.part.PartPos;
 import org.cyclops.integrateddynamics.api.part.PrioritizedPartPos;
@@ -66,7 +67,7 @@ public Iterator<PartPos> getPositions(T instance, M matchFlags) {
     public void addPosition(T instance, PrioritizedPartPos pos) {
         IIngredientMapMutable<T, M, ObjectOpenHashSet<PartPos>> positionsMap = this.prioritizedPositionsMap.get(getInternalPriority(pos));
         if (positionsMap == null) {
-            positionsMap = new IngredientHashMap<>(getComponent());
+            positionsMap = createCollapsedMap(getComponent());
             this.prioritizedPositionsMap.put(getInternalPriority(pos), positionsMap);
         }
 
@@ -80,6 +81,17 @@ public void addPosition(T instance, PrioritizedPartPos pos) {
         set.add(pos.getPartPos());
     }
 
+    // If this would ever be needed in other places as well, let's move this to IngredientCollectionHelpers
+    protected static <T, M> IIngredientMapMutable<T, M, ObjectOpenHashSet<PartPos>> createCollapsedMap(IngredientComponent<T, M> ingredientComponent) {
+        if (ingredientComponent.getCategoryTypes().size() == 1) {
+            return new IngredientHashMap<>(ingredientComponent);
+        }
+        return new IngredientMapSingleClassified<>(
+                ingredientComponent,
+                () -> new IngredientHashMap<>(ingredientComponent),
+                ingredientComponent.getCategoryTypes().get(0));
+    }
+
     @Override
     public void removePosition(T instance, PrioritizedPartPos pos) {
         IIngredientMapMutable<T, M, ObjectOpenHashSet<PartPos>> positionsMap = this.prioritizedPositionsMap.get(getInternalPriority(pos));