@Override
  public void deserializeWorld(EntityData.World world) {
    entityManager.setNextId(world.getNextEntityId());
    for (Integer deadId : world.getFreedEntityIdList()) {
      entityManager.getFreedIds().add(deadId);
    }

    for (EntityData.Prefab prefabData : world.getPrefabList()) {
      if (!prefabManager.exists(prefabData.getName())) {
        deserializePrefab(prefabData);
      }
    }

    for (int index = 0; index < world.getComponentClassCount(); ++index) {
      ComponentMetadata componentMetadata =
          componentLibrary.getMetadata(world.getComponentClass(index));
      if (componentMetadata != null) {
        componentIdTable.put(index, componentMetadata.getType());
      }
    }

    for (EntityData.Entity entityData : world.getEntityList()) {
      deserializeEntity(entityData);
    }
  }
 private void writeIdInfo(final EntityData.World.Builder world) {
   world.setNextEntityId(entityManager.getNextId());
   entityManager
       .getFreedIds()
       .forEach(
           new TIntProcedure() {
             public boolean execute(int i) {
               world.addFreedEntityId(i);
               return true;
             }
           });
 }
  @Override
  public EntityRef deserializeEntity(EntityData.Entity entityData) {
    EntityRef entity = entityManager.createEntityRefWithId(entityData.getId());
    if (entityData.hasParentPrefab()
        && !entityData.getParentPrefab().isEmpty()
        && prefabManager.exists(entityData.getParentPrefab())) {
      Prefab prefab = prefabManager.getPrefab(entityData.getParentPrefab());
      for (Component component : prefab.listComponents()) {
        String componentName = ComponentUtil.getComponentClassName(component.getClass());
        if (!containsIgnoreCase(componentName, entityData.getRemovedComponentList())) {
          entity.addComponent(componentLibrary.copy(component));
        }
      }
      entity.addComponent(new EntityInfoComponent(entityData.getParentPrefab()));
    }
    for (EntityData.Component componentData : entityData.getComponentList()) {
      Class<? extends Component> componentClass = getComponentClass(componentData);
      if (componentClass == null) continue;

      if (!entity.hasComponent(componentClass)) {
        entity.addComponent(deserializeComponent(componentData));
      } else {
        deserializeComponentOnto(entity.getComponent(componentClass), componentData);
      }
    }
    return entity;
  }
  @Override
  public EntityData.World serializeWorld() {
    final EntityData.World.Builder world = EntityData.World.newBuilder();
    writeIdInfo(world);

    if (isUsingLookupTables()) {
      writeComponentTypeTable(world);
    }

    for (Prefab prefab : prefabManager.listPrefabs()) {
      world.addPrefab(serializePrefab(prefab));
    }

    for (EntityRef entity : entityManager.iteratorEntities()) {
      world.addEntity(serializeEntity(entity));
    }
    return world.build();
  }
 public EntityPersisterHelperImpl(PersistableEntityManager entityManager) {
   this.componentLibrary = entityManager.getComponentLibrary();
   this.entityManager = entityManager;
   this.prefabManager = entityManager.getPrefabManager();
 }