Readd warnings for missing mappings

core/src/main/java/nl/matsv/viabackwards/api/data/BackwardsMappings.java

@@ -84,11 +84,35 @@ public class BackwardsMappings extends MappingData {
         return VBMappingDataLoader.loadFromDataDir("mapping-" + newVersion + "to" + oldVersion + ".json");
     }
 
+    /**
+     * To be overridden.
+     */
+    protected void loadVBExtras(JsonObject oldMappings, JsonObject newMappings) {
+    }
+
     protected boolean shouldWarnOnMissing(String key) {
         return !key.equals("blocks") && !key.equals("statistics");
     }
 
-    protected void loadVBExtras(JsonObject oldMappings, JsonObject newMappings) {
+    /**
+     * @see #getMappedItem(int) for custom backwards mappings
+     */
+    @Override
+    public int getNewItemId(int id) {
+        // Don't warn on missing here
+        return this.itemMappings.get(id);
+    }
+
+    @Override
+    public int getNewBlockId(int id) {
+        // Don't warn on missing here
+        return this.blockMappings.getNewId(id);
+    }
+
+    @Override
+    public int getOldItemId(final int id) {
+        // Warn on missing
+        return checkValidity(id, this.itemMappings.inverse().get(id), "item");
     }
 
     @Nullable
@@ -101,11 +125,6 @@ public class BackwardsMappings extends MappingData {
         return backwardsSoundMappings != null ? backwardsSoundMappings.get(id) : null;
     }
 
-    @Override
-    protected int checkValidity(int id, String type) {
-        return id;
-    }
-
     @Nullable
     public Int2ObjectMap<MappedItem> getBackwardsItemMappings() {
         return backwardsItemMappings;

core/src/main/java/nl/matsv/viabackwards/api/rewriters/ItemRewriter.java

@@ -25,9 +25,8 @@ public abstract class ItemRewriter<T extends BackwardsProtocol> extends ItemRewr
     public Item handleItemToClient(Item item) {
         if (item == null) return null;
 
-        CompoundTag display = null;
-        if (translatableRewriter != null
-                && item.getTag() != null && (display = item.getTag().get("display")) != null) {
+        CompoundTag display = item.getTag() != null ? item.getTag().get("display") : null;
+        if (translatableRewriter != null && display != null) {
             // Handle name and lore components
             StringTag name = display.get("Name");
             if (name != null) {

core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_12_2to1_13/data/BackwardsMappings.java

@@ -84,12 +84,6 @@ public class BackwardsMappings extends nl.matsv.viabackwards.api.data.BackwardsM
         }
     }
 
-    @Override
-    public int getOldItemId(final int id) {
-        // Return -1 when missing
-        return this.itemMappings.inverse().get(id);
-    }
-
     @Override
     @Nullable
     protected Mappings loadFromObject(JsonObject oldMappings, JsonObject newMappings, @Nullable JsonObject diffMappings, String key) {
@@ -103,6 +97,12 @@ public class BackwardsMappings extends nl.matsv.viabackwards.api.data.BackwardsM
         }
     }
 
+    @Override
+    protected int checkValidity(int id, int mappedId, String type) {
+        // Don't warn for missing ids here
+        return mappedId;
+    }
+
     public Int2ObjectMap<String> getStatisticMappings() {
         return statisticMappings;
     }