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chrome/browser/history/url_database.h

 // Copyright (c) 2012 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 CHROME_BROWSER_HISTORY_URL_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_URL_DATABASE_H_
 
 #include "base/basictypes.h"
+#include "base/observer_list.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/history/query_parser.h"
 #include "chrome/browser/search_engines/template_url_id.h"
 #include "sql/statement.h"
 
 class GURL;
 
 namespace sql {
 class Connection;
 }
 
 namespace history {
 
 class VisitDatabase;  // For friend statement.
+class URLDatabaseObserver;
 
 // Encapsulates an SQL database that holds URL info.  This is a subset of the
 // full history data.  We split this class' functionality out from the larger
 // HistoryDatabase class to support maintaining separate databases of URLs with
 // different capabilities (for example, in-memory, or archived).
 //
 // This is refcounted to support calling InvokeLater() with some of its methods
 // (necessary to maintain ordering of DB operations).
 class URLDatabase {
  public:
@@ skipping 199 matching lines @@
   // Do to a bug we were setting the favicon of about:blank. This forces
   // about:blank to have no icon or title. Returns true on success, false if
   // the favicon couldn't be updated.
   bool MigrateFromVersion11ToVersion12();
 
   // Initializes the given enumerator to enumerator all URL and icon mappings
   // in the database. Only used for icon mapping migration.
   bool InitIconMappingEnumeratorForEverything(
       IconMappingEnumerator* enumerator);
 
+  void AddObserver(URLDatabaseObserver* observer);
+  void RemoveObserver(URLDatabaseObserver* observer);
+
  protected:
   friend class VisitDatabase;
 
   // See HISTORY_URL_ROW_FIELDS below.
   static const char kURLRowFields[];
 
   // The number of fiends in kURLRowFields. If callers need additional
   // fields, they can add their 0-based index to this value to get the index of
   // fields following kURLRowFields.
   static const int kNumURLRowFields;
@@ skipping 37 matching lines @@
 
   // Returns the database for the functions in this interface. The decendent of
   // this class implements these functions to return its objects.
   virtual sql::Connection& GetDB() = 0;
 
  private:
   // True if InitKeywordSearchTermsTable() has been invoked. Not all subclasses
   // have keyword search terms.
   bool has_keyword_search_terms_;
 
+  ObserverList<URLDatabaseObserver> observers_;
+
   QueryParser query_parser_;
 
   DISALLOW_COPY_AND_ASSIGN(URLDatabase);
 };
 
 // The fields and order expected by FillURLRow(). ID is guaranteed to be first
 // so that DISTINCT can be prepended to get distinct URLs.
 //
 // This is available BOTH as a macro and a static string (kURLRowFields). Use
 // the macro if you want to put this in the middle of an otherwise constant
 // string, it will save time doing string appends. If you have to build a SQL
 // string dynamically anyway, use the constant, it will save space.
 #define HISTORY_URL_ROW_FIELDS \
     " urls.id, urls.url, urls.title, urls.visit_count, urls.typed_count, " \
     "urls.last_visit_time, urls.hidden "
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_URL_DATABASE_H_