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Diffstat (limited to 'tensorflow/core/lib/io/iterator.cc')
-rw-r--r-- | tensorflow/core/lib/io/iterator.cc | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/tensorflow/core/lib/io/iterator.cc b/tensorflow/core/lib/io/iterator.cc new file mode 100644 index 0000000000..878e93a911 --- /dev/null +++ b/tensorflow/core/lib/io/iterator.cc @@ -0,0 +1,72 @@ +// Copyright (c) 2011 The LevelDB Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "tensorflow/core/lib/io/iterator.h" + +namespace tensorflow { +namespace table { + +Iterator::Iterator() { + cleanup_.function = NULL; + cleanup_.next = NULL; +} + +Iterator::~Iterator() { + if (cleanup_.function != NULL) { + (*cleanup_.function)(cleanup_.arg1, cleanup_.arg2); + for (Cleanup* c = cleanup_.next; c != NULL;) { + (*c->function)(c->arg1, c->arg2); + Cleanup* next = c->next; + delete c; + c = next; + } + } +} + +void Iterator::RegisterCleanup(CleanupFunction func, void* arg1, void* arg2) { + assert(func != NULL); + Cleanup* c; + if (cleanup_.function == NULL) { + c = &cleanup_; + } else { + c = new Cleanup; + c->next = cleanup_.next; + cleanup_.next = c; + } + c->function = func; + c->arg1 = arg1; + c->arg2 = arg2; +} + +namespace { +class EmptyIterator : public Iterator { + public: + EmptyIterator(const Status& s) : status_(s) {} + virtual bool Valid() const { return false; } + virtual void Seek(const StringPiece& target) {} + virtual void SeekToFirst() {} + virtual void Next() { assert(false); } + StringPiece key() const { + assert(false); + return StringPiece(); + } + StringPiece value() const { + assert(false); + return StringPiece(); + } + virtual Status status() const { return status_; } + + private: + Status status_; +}; +} // namespace + +Iterator* NewEmptyIterator() { return new EmptyIterator(Status::OK()); } + +Iterator* NewErrorIterator(const Status& status) { + return new EmptyIterator(status); +} + +} // namespace table +} // namespace tensorflow |