2nd try: Implement QM::GetOriginsModifiedSince for browser data deleter support

webkit/quota/quota_database.h

 // Copyright (c) 2011 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 WEBKIT_QUOTA_QUOTA_DATABASE_H_
 #define WEBKIT_QUOTA_QUOTA_DATABASE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 23 matching lines @@
 class QuotaDatabase {
  public:
   // If 'path' is empty, an in memory database will be used.
   explicit QuotaDatabase(const FilePath& path);
   ~QuotaDatabase();
 
   void CloseConnection();
 
   bool GetHostQuota(const std::string& host, StorageType type, int64* quota);
   bool SetHostQuota(const std::string& host, StorageType type, int64 quota);
+  bool DeleteHostQuota(const std::string& host, StorageType type);
 
-  bool SetOriginLastAccessTime(const GURL& origin, StorageType type,
+  bool SetOriginLastAccessTime(const GURL& origin,
+                               StorageType type,
                                base::Time last_access_time);
 
-  // Register |origins| to Database with |used_count| = 0 and
-  // specified |last_access_time|.
-  bool RegisterOrigins(const std::set<GURL>& origins,
-                       StorageType type,
-                       base::Time last_access_time);
+  bool SetOriginLastModifiedTime(const GURL& origin,
+                                 StorageType type,
+                                 base::Time last_modified_time);
 
-  bool DeleteHostQuota(const std::string& host, StorageType type);
-  bool DeleteOriginLastAccessTime(const GURL& origin, StorageType type);
+  // Register initial |origins| info |type| to the database.
+  // This method is assumed to be called only after the installation or
+  // the database schema reset.
+  bool RegisterInitialOriginInfo(
+      const std::set<GURL>& origins, StorageType type);
+
+  bool DeleteOriginInfo(const GURL& origin, StorageType type);
 
   bool GetGlobalQuota(StorageType type, int64* quota);
   bool SetGlobalQuota(StorageType type, int64 quota);
 
   // Sets |origin| to the least recently used origin of origins not included
   // in |exceptions| and not granted the special unlimited storage right.
   // It returns false when it failed in accessing the database.
   // |origin| is set to empty when there is no matching origin.
   bool GetLRUOrigin(StorageType type,
                     const std::set<GURL>& exceptions,
                     SpecialStoragePolicy* special_storage_policy,
                     GURL* origin);
 
+  // Populates |origins| with the ones that have been modified since
+  // the |modified_since|.
+  bool GetOriginsModifiedSince(StorageType type,
+                               std::set<GURL>* origins,
+                               base::Time modified_since);
+
   // Returns false if SetOriginDatabaseBootstrapped has never
   // been called before, which means existing origins may not have been
   // registered.
   bool IsOriginDatabaseBootstrapped();
   bool SetOriginDatabaseBootstrapped(bool bootstrap_flag);
 
  private:
   struct QuotaTableEntry {
+    QuotaTableEntry();
+    QuotaTableEntry(
+        const std::string& host,
+        StorageType type,
+        int64 quota);
     std::string host;
     StorageType type;
     int64 quota;
   };
   friend bool operator <(const QuotaTableEntry& lhs,
                          const QuotaTableEntry& rhs);
 
-  struct LastAccessTimeTableEntry {
+  struct OriginInfoTableEntry {
+    OriginInfoTableEntry();
+    OriginInfoTableEntry(
+        const GURL& origin,
+        StorageType type,
+        int used_count,
+        const base::Time& last_access_time,
+        const base::Time& last_modified_time);
     GURL origin;
     StorageType type;
     int used_count;
     base::Time last_access_time;
+    base::Time last_modified_time;
   };
-  friend bool operator <(const LastAccessTimeTableEntry& lhs,
-                         const LastAccessTimeTableEntry& rhs);
+  friend bool operator <(const OriginInfoTableEntry& lhs,
+                         const OriginInfoTableEntry& rhs);
+
+  // Structures used for CreateSchema.
+  struct TableSchema {
+    const char* table_name;
+    const char* columns;
+  };
+  struct IndexSchema {
+    const char* index_name;
+    const char* table_name;
+    const char* columns;
+    bool unique;
+  };
 
   typedef base::Callback<bool (const QuotaTableEntry&)> QuotaTableCallback;
-  typedef base::Callback<bool (const LastAccessTimeTableEntry&)>
-      LastAccessTimeTableCallback;
+  typedef base::Callback<bool (const OriginInfoTableEntry&)>
+      OriginInfoTableCallback;
+
+  struct QuotaTableImporter;
 
   // For long-running transactions support.  We always keep a transaction open
   // so that multiple transactions can be batched.  They are flushed
   // with a delay after a modification has been made.  We support neither
   // nested transactions nor rollback (as we don't need them for now).
   void Commit();
   void ScheduleCommit();
 
   bool FindOriginUsedCount(const GURL& origin,
                            StorageType type,
                            int* used_count);
 
   bool LazyOpen(bool create_if_needed);
   bool EnsureDatabaseVersion();
-  bool CreateSchema();
   bool ResetSchema();
+  bool UpgradeSchema(int current_version);
 
-  // |callback| may return false to stop reading data
+  static bool CreateSchema(
+      sql::Connection* database,
+      sql::MetaTable* meta_table,
+      int schema_version, int compatible_version,
+      const TableSchema* tables, size_t tables_size,
+      const IndexSchema* indexes, size_t indexes_size);
+
+  // |callback| may return false to stop reading data.
   bool DumpQuotaTable(QuotaTableCallback* callback);
-  bool DumpLastAccessTimeTable(LastAccessTimeTableCallback* callback);
-
+  bool DumpOriginInfoTable(OriginInfoTableCallback* callback);
 
   FilePath db_file_path_;
 
   scoped_ptr<sql::Connection> db_;
   scoped_ptr<sql::MetaTable> meta_table_;
   bool is_recreating_;
   bool is_disabled_;
 
   base::OneShotTimer<QuotaDatabase> timer_;
 
   friend class QuotaDatabaseTest;
   friend class QuotaManager;
 
+  static const TableSchema kTables[];
+  static const IndexSchema kIndexes[];
+
   DISALLOW_COPY_AND_ASSIGN(QuotaDatabase);
 };
 
 }  // namespace quota
 
 #endif  // WEBKIT_QUOTA_QUOTA_DATABASE_H_