code: public Map<String, DeleteOperation> getDeleteOperations() {
      Map<String, DeleteOperation> delOperations = new TreeMap<String, DeleteOperation>();
      for (Entry<String, IOperation> entry : collectionUpdateData.entrySet()) {
        String key = entry.getKey();
        IOperation op = entry.getValue();
        if (op.getOperationType().equals(Type.DELETE)) {
          delOperations.put(key, (DeleteOperation)op);
        }
      }
      return delOperations;
    }
docs: Returns a Map of DELETE operations.
  
  @return Map of DELETE operations which have a non-null  default value specified