-
Notifications
You must be signed in to change notification settings - Fork 545
/
cursor.cpp
112 lines (91 loc) · 3.3 KB
/
cursor.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
// Copyright 2014 MongoDB Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <mongocxx/cursor.hpp>
#include <cstdint>
#include <memory>
#include <string>
#include <tuple>
#include <bsoncxx/private/libbson.hh>
#include <bsoncxx/stdx/make_unique.hpp>
#include <mongocxx/exception/private/error_category.hh>
#include <mongocxx/exception/private/mongoc_error.hh>
#include <mongocxx/exception/query_exception.hpp>
#include <mongocxx/private/cursor.hh>
#include <mongocxx/private/libmongoc.hh>
#include <mongocxx/config/private/prelude.hh>
namespace mongocxx {
MONGOCXX_INLINE_NAMESPACE_BEGIN
cursor::cursor(void* cursor_ptr, bsoncxx::stdx::optional<cursor::type> cursor_type)
: _impl(stdx::make_unique<impl>(static_cast<mongoc_cursor_t*>(cursor_ptr), cursor_type)) {}
cursor::cursor(cursor&&) noexcept = default;
cursor& cursor::operator=(cursor&&) noexcept = default;
cursor::~cursor() = default;
void cursor::iterator::operator++(int) {
operator++();
}
cursor::iterator& cursor::iterator::operator++() {
const bson_t* out;
bson_error_t error;
if (libmongoc::cursor_next(_cursor->_impl->cursor_t, &out)) {
_cursor->_impl->doc = bsoncxx::document::view{bson_get_data(out), out->len};
} else if (libmongoc::cursor_error(_cursor->_impl->cursor_t, &error)) {
_cursor->_impl->mark_dead();
throw_exception<query_exception>(error);
} else {
_cursor->_impl->mark_nothing_left();
}
return *this;
}
cursor::iterator cursor::begin() {
if (_impl->is_dead()) {
return end();
}
return iterator(this);
}
cursor::iterator cursor::end() {
return iterator(nullptr);
}
cursor::iterator::iterator(cursor* cursor) : _cursor(cursor) {
if (_cursor == nullptr || _cursor->_impl->has_started()) {
return;
}
_cursor->_impl->mark_started();
operator++();
}
//
// An iterator is exhausted if it is the end-iterator (_cursor == nullptr)
// or if the underlying _cursor is marked exhausted.
//
bool cursor::iterator::is_exhausted() const {
return !_cursor || _cursor->_impl->is_exhausted();
}
const bsoncxx::document::view& cursor::iterator::operator*() const {
return _cursor->_impl->doc;
}
const bsoncxx::document::view* cursor::iterator::operator->() const {
return &_cursor->_impl->doc;
}
//
// Iterators are equal if they point to the same underlying _cursor or if they
// both are "at the end". We check for exhaustion first because the most
// common check is `iter != cursor.end()`.
//
bool MONGOCXX_CALL operator==(const cursor::iterator& lhs, const cursor::iterator& rhs) {
return ((rhs.is_exhausted() && lhs.is_exhausted()) || (lhs._cursor == rhs._cursor));
}
bool MONGOCXX_CALL operator!=(const cursor::iterator& lhs, const cursor::iterator& rhs) {
return !(lhs == rhs);
}
MONGOCXX_INLINE_NAMESPACE_END
} // namespace mongocxx