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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_HISTORY_IN_MEMORY_DATABASE_H_
      6 #define CHROME_BROWSER_HISTORY_IN_MEMORY_DATABASE_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "chrome/browser/history/url_database.h"
     10 #include "sql/connection.h"
     11 
     12 namespace base {
     13 class FilePath;
     14 }
     15 
     16 namespace history {
     17 
     18 // Class used for a fast in-memory cache of typed URLs. Used for inline
     19 // autocomplete since it is fast enough to be called synchronously as the user
     20 // is typing.
     21 class InMemoryDatabase : public URLDatabase {
     22  public:
     23   InMemoryDatabase();
     24   virtual ~InMemoryDatabase();
     25 
     26   // Creates an empty in-memory database.
     27   bool InitFromScratch();
     28 
     29   // Initializes the database by directly slurping the data from the given
     30   // file. Conceptually, the InMemoryHistoryBackend should do the populating
     31   // after this object does some common initialization, but that would be
     32   // much slower.
     33   bool InitFromDisk(const base::FilePath& history_name);
     34 
     35  protected:
     36   // Implemented for URLDatabase.
     37   virtual sql::Connection& GetDB() OVERRIDE;
     38 
     39  private:
     40   // Initializes the database connection, this is the shared code between
     41   // InitFromScratch() and InitFromDisk() above. Returns true on success.
     42   bool InitDB();
     43 
     44   sql::Connection db_;
     45 
     46   DISALLOW_COPY_AND_ASSIGN(InMemoryDatabase);
     47 };
     48 
     49 }  // namespace history
     50 
     51 #endif  // CHROME_BROWSER_HISTORY_IN_MEMORY_DATABASE_H_
     52