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authorLorry Tar Creator <lorry-tar-importer@lorry>2017-06-27 06:07:23 +0000
committerLorry Tar Creator <lorry-tar-importer@lorry>2017-06-27 06:07:23 +0000
commit1bf1084f2b10c3b47fd1a588d85d21ed0eb41d0c (patch)
tree46dcd36c86e7fbc6e5df36deb463b33e9967a6f7 /Source/ThirdParty/leveldb/table/iterator_wrapper.h
parent32761a6cee1d0dee366b885b7b9c777e67885688 (diff)
downloadWebKitGtk-tarball-master.tar.gz
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-// 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.
-
-#ifndef STORAGE_LEVELDB_TABLE_ITERATOR_WRAPPER_H_
-#define STORAGE_LEVELDB_TABLE_ITERATOR_WRAPPER_H_
-
-namespace leveldb {
-
-// A internal wrapper class with an interface similar to Iterator that
-// caches the valid() and key() results for an underlying iterator.
-// This can help avoid virtual function calls and also gives better
-// cache locality.
-class IteratorWrapper {
- public:
- IteratorWrapper(): iter_(NULL), valid_(false) { }
- explicit IteratorWrapper(Iterator* iter): iter_(NULL) {
- Set(iter);
- }
- ~IteratorWrapper() { delete iter_; }
- Iterator* iter() const { return iter_; }
-
- // Takes ownership of "iter" and will delete it when destroyed, or
- // when Set() is invoked again.
- void Set(Iterator* iter) {
- delete iter_;
- iter_ = iter;
- if (iter_ == NULL) {
- valid_ = false;
- } else {
- Update();
- }
- }
-
-
- // Iterator interface methods
- bool Valid() const { return valid_; }
- Slice key() const { assert(Valid()); return key_; }
- Slice value() const { assert(Valid()); return iter_->value(); }
- // Methods below require iter() != NULL
- Status status() const { assert(iter_); return iter_->status(); }
- void Next() { assert(iter_); iter_->Next(); Update(); }
- void Prev() { assert(iter_); iter_->Prev(); Update(); }
- void Seek(const Slice& k) { assert(iter_); iter_->Seek(k); Update(); }
- void SeekToFirst() { assert(iter_); iter_->SeekToFirst(); Update(); }
- void SeekToLast() { assert(iter_); iter_->SeekToLast(); Update(); }
-
- private:
- void Update() {
- valid_ = iter_->Valid();
- if (valid_) {
- key_ = iter_->key();
- }
- }
-
- Iterator* iter_;
- bool valid_;
- Slice key_;
-};
-
-} // namespace leveldb
-
-#endif // STORAGE_LEVELDB_TABLE_ITERATOR_WRAPPER_H_