1 /* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
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
16 #include "tensorflow/core/lib/io/iterator.h"
17
18 namespace tensorflow {
19 namespace table {
20
Iterator()21 Iterator::Iterator() {
22 cleanup_.function = nullptr;
23 cleanup_.next = nullptr;
24 }
25
~Iterator()26 Iterator::~Iterator() {
27 if (cleanup_.function != nullptr) {
28 (*cleanup_.function)(cleanup_.arg1, cleanup_.arg2);
29 for (Cleanup* c = cleanup_.next; c != nullptr;) {
30 (*c->function)(c->arg1, c->arg2);
31 Cleanup* next = c->next;
32 delete c;
33 c = next;
34 }
35 }
36 }
37
RegisterCleanup(CleanupFunction func,void * arg1,void * arg2)38 void Iterator::RegisterCleanup(CleanupFunction func, void* arg1, void* arg2) {
39 assert(func != nullptr);
40 Cleanup* c;
41 if (cleanup_.function == nullptr) {
42 c = &cleanup_;
43 } else {
44 c = new Cleanup;
45 c->next = cleanup_.next;
46 cleanup_.next = c;
47 }
48 c->function = func;
49 c->arg1 = arg1;
50 c->arg2 = arg2;
51 }
52
53 namespace {
54 class EmptyIterator : public Iterator {
55 public:
EmptyIterator(const Status & s)56 explicit EmptyIterator(const Status& s) : status_(s) {}
Valid() const57 bool Valid() const override { return false; }
Seek(const StringPiece & target)58 void Seek(const StringPiece& target) override {}
SeekToFirst()59 void SeekToFirst() override {}
Next()60 void Next() override { assert(false); }
key() const61 StringPiece key() const override {
62 assert(false);
63 return StringPiece();
64 }
value() const65 StringPiece value() const override {
66 assert(false);
67 return StringPiece();
68 }
status() const69 Status status() const override { return status_; }
70
71 private:
72 Status status_;
73 };
74 } // namespace
75
NewEmptyIterator()76 Iterator* NewEmptyIterator() { return new EmptyIterator(Status::OK()); }
77
NewErrorIterator(const Status & status)78 Iterator* NewErrorIterator(const Status& status) {
79 return new EmptyIterator(status);
80 }
81
82 } // namespace table
83 } // namespace tensorflow
84