Migrate the IndexedDB backend from Blink to Chromium

content/browser/indexed_db/leveldb/leveldb_database.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
+#define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
+
+#include <vector>
+
+#include "base/files/file_path.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/string16.h"
+#include "content/common/content_export.h"
+
+namespace leveldb {
+class Comparator;
+class DB;
+class Env;
+class Snapshot;
+}
+
+namespace content {
+
+class LevelDBComparator;
+class LevelDBDatabase;
+class LevelDBIterator;
+class LevelDBSlice;
+class LevelDBWriteBatch;
+
+class LevelDBSnapshot {
+ private:
+  friend class LevelDBDatabase;
+  friend class LevelDBTransaction;
+
+  explicit LevelDBSnapshot(LevelDBDatabase*);
+  ~LevelDBSnapshot();
+
+  leveldb::DB* db_;
+  const leveldb::Snapshot* snapshot_;
+};
+
+class CONTENT_EXPORT LevelDBDatabase {
+ public:
+  static scoped_ptr<LevelDBDatabase> Open(const base::FilePath&,
+                                          const LevelDBComparator*);
+  static scoped_ptr<LevelDBDatabase> OpenInMemory(const LevelDBComparator*);
+  static bool Destroy(const base::FilePath&);
+  virtual ~LevelDBDatabase();
+
+  bool Put(const LevelDBSlice& key, const std::vector<char>& value);
+  bool Remove(const LevelDBSlice& key);
+  virtual bool Get(const LevelDBSlice& key,
+                   std::vector<char>& value,
+                   bool& found,
+                   const LevelDBSnapshot* = 0);
+  bool Write(LevelDBWriteBatch&);
+  scoped_ptr<LevelDBIterator> CreateIterator(const LevelDBSnapshot* = 0);
+  const LevelDBComparator* Comparator() const;
+
+ protected:
+  LevelDBDatabase();
+
+ private:
+  friend class LevelDBSnapshot;
+
+  scoped_ptr<leveldb::Env> env_;
+  scoped_ptr<leveldb::Comparator> comparator_adapter_;
+  scoped_ptr<leveldb::DB> db_;
+  const LevelDBComparator* comparator_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_