#685: Implement support for PersistentDataContainer arrays

src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataTypeRegistry.java

@@ -14,6 +14,7 @@ import net.minecraft.server.NBTTagDouble;
 import net.minecraft.server.NBTTagFloat;
 import net.minecraft.server.NBTTagInt;
 import net.minecraft.server.NBTTagIntArray;
+import net.minecraft.server.NBTTagList;
 import net.minecraft.server.NBTTagLong;
 import net.minecraft.server.NBTTagLongArray;
 import net.minecraft.server.NBTTagShort;
@@ -148,6 +149,32 @@ public final class CraftPersistentDataTypeRegistry {
             return createAdapter(long[].class, NBTTagLongArray.class, array -> new NBTTagLongArray(Arrays.copyOf(array, array.length)), n -> Arrays.copyOf(n.getLongs(), n.size()));
         }
 
+        /*
+            Complex Arrays
+         */
+        if (Objects.equals(PersistentDataContainer[].class, type)) {
+            return createAdapter(PersistentDataContainer[].class, NBTTagList.class,
+                    (containerArray) -> {
+                        NBTTagList list = new NBTTagList();
+                        for (int i = 0; i < containerArray.length; i++) {
+                            list.add(((CraftPersistentDataContainer) containerArray[i]).toTagCompound());
+                        }
+                        return list;
+                    },
+                    (tag) -> {
+                        PersistentDataContainer[] containerArray = new CraftPersistentDataContainer[tag.size()];
+                        for (int i = 0; i < tag.size(); i++) {
+                            CraftPersistentDataContainer container = new CraftPersistentDataContainer(this);
+                            NBTTagCompound compound = tag.getCompound(i);
+                            for (String key : compound.getKeys()) {
+                                container.put(key, compound.get(key));
+                            }
+                            containerArray[i] = container;
+                        }
+                        return containerArray;
+                    });
+        }
+
         /*
             Note that this will map the interface PersistentMetadataContainer directly to the CraftBukkit implementation
             Passing any other instance of this form to the tag type registry will throw a ClassCastException as defined in TagAdapter#build