components/precache/core/precache_url_table.h

   1 // Copyright 2013 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 COMPONENTS_PRECACHE_CORE_PRECACHE_URL_TABLE_H_
   6 #define COMPONENTS_PRECACHE_CORE_PRECACHE_URL_TABLE_H_
   7
   8 #include <map>
   9
  10 #include "base/basictypes.h"
  11 #include "base/time/time.h"
  12 #include "url/gurl.h"
  13
  14 namespace sql {
  15 class Connection;
  16 }
  17
  18 namespace precache {
  19
  20 // Interface for database table that keeps track of the URLs that have been
  21 // precached but not used. Each row in this table represents a URL that was
  22 // precached over the network, and has not been fetched through user browsing
  23 // since then. Manages one table { URL (primary key), precache timestamp }.
  24 class PrecacheURLTable {
  25  public:
  26   PrecacheURLTable();
  27   ~PrecacheURLTable();
  28
  29   // Initialize the precache URL table for use with the specified database
  30   // connection. The caller keeps ownership of |db|, and |db| must not be NULL.
  31   // Init must be called before any other methods.
  32   bool Init(sql::Connection* db);
  33
  34   // Adds a precached URL to the table, using the current time as the
  35   // precache timestamp. Replaces the row if one already exists.
  36   void AddURL(const GURL& url, const base::Time& precache_time);
  37
  38   // Returns true if this URL exists in the table.
  39   bool HasURL(const GURL& url);
  40
  41   // Deletes the row from the table that has the given URL, if it exists.
  42   void DeleteURL(const GURL& url);
  43
  44   // Deletes entries that were precached before the time of |delete_end|.
  45   void DeleteAllPrecachedBefore(const base::Time& delete_end);
  46
  47   // Delete all entries.
  48   void DeleteAll();
  49
  50   // Used by tests to get the contents of the table.
  51   void GetAllDataForTesting(std::map<GURL, base::Time>* map);
  52
  53  private:
  54   bool CreateTableIfNonExistent();
  55
  56   // Non-owned pointer.
  57   sql::Connection* db_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(PrecacheURLTable);
  60 };
  61
  62 }  // namespace precache
  63
  64 #endif  // COMPONENTS_PRECACHE_CORE_PRECACHE_URL_TABLE_H_