Google Cloud Storage C++ Client  1.32.1
A C++ Client Library for Google Cloud Storage
list_objects_and_prefixes_reader.h
Go to the documentation of this file.
1 // Copyright 2020 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #ifndef GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_STORAGE_LIST_OBJECTS_AND_PREFIXES_READER_H
16 #define GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_STORAGE_LIST_OBJECTS_AND_PREFIXES_READER_H
17 
18 #include "google/cloud/storage/internal/object_requests.h"
19 #include "google/cloud/internal/pagination_range.h"
20 #include "absl/types/variant.h"
21 #include <iterator>
22 #include <string>
23 #include <vector>
24 
25 namespace google {
26 namespace cloud {
27 namespace storage {
28 inline namespace STORAGE_CLIENT_NS {
29 using ObjectOrPrefix = absl::variant<ObjectMetadata, std::string>;
30 
31 using ListObjectsAndPrefixesReader =
32  google::cloud::internal::PaginationRange<ObjectOrPrefix>;
33 
34 using ListObjectsAndPrefixesIterator = ListObjectsAndPrefixesReader::iterator;
35 
36 namespace internal {
37 inline void SortObjectsAndPrefixes(std::vector<ObjectOrPrefix>& in) {
38  struct GetNameOrPrefix {
39  std::string const& operator()(std::string const& v) { return v; }
40  std::string const& operator()(ObjectMetadata const& v) { return v.name(); }
41  };
42  std::sort(in.begin(), in.end(),
43  [](ObjectOrPrefix const& a, ObjectOrPrefix const& b) {
44  return (absl::visit(GetNameOrPrefix{}, a) <
45  absl::visit(GetNameOrPrefix{}, b));
46  });
47 }
48 } // namespace internal
49 
50 } // namespace STORAGE_CLIENT_NS
51 } // namespace storage
52 } // namespace cloud
53 } // namespace google
54 
55 #endif // GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_STORAGE_LIST_OBJECTS_AND_PREFIXES_READER_H