chrome/browser/search_engines/search_provider_install_data.h

   1 // Copyright (c) 2012 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_SEARCH_ENGINES_SEARCH_PROVIDER_INSTALL_DATA_H_
   6 #define CHROME_BROWSER_SEARCH_ENGINES_SEARCH_PROVIDER_INSTALL_DATA_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/scoped_vector.h"
  15 #include "base/memory/weak_ptr.h"
  16
  17 class GURL;
  18 class GoogleURLTracker;
  19 class SearchHostToURLsMap;
  20 class TemplateURL;
  21 class TemplateURLService;
  22
  23 namespace content {
  24 class RenderProcessHost;
  25 }
  26
  27 // Provides the search provider install state for the I/O thread. It works by
  28 // loading the data on demand (when CallWhenLoaded is called) and then throwing
  29 // away the results after the callbacks are done, so the results are always up
  30 // to date with what is in the database.
  31 class SearchProviderInstallData {
  32  public:
  33   enum State {
  34     // The search provider is not installed.
  35     NOT_INSTALLED = 0,
  36
  37     // The search provider is in the user's set but is not
  38     INSTALLED_BUT_NOT_DEFAULT = 1,
  39
  40     // The search provider is set as the user's default.
  41     INSTALLED_AS_DEFAULT = 2
  42   };
  43
  44   // |host| is a RenderProcessHost that is observed, and whose destruction is a
  45   // signal to this class that it no longer needs to be kept up to date. (Note
  46   // that this class may be deleted before or after that death occurs. It
  47   // doesn't matter.)
  48   SearchProviderInstallData(TemplateURLService* template_url_service,
  49                             const std::string& google_base_url,
  50                             GoogleURLTracker* google_url_tracker,
  51                             content::RenderProcessHost* host);
  52   virtual ~SearchProviderInstallData();
  53
  54   // Use to determine when the search provider information is loaded. The
  55   // callback may happen synchronously or asynchronously. There is no need to do
  56   // anything special to make it function (as it just relies on the normal I/O
  57   // thread message loop).
  58   void CallWhenLoaded(const base::Closure& closure);
  59
  60   // Returns the search provider install state for the given origin.
  61   // This should only be called while a task is called back from CallWhenLoaded.
  62   State GetInstallState(const GURL& requested_origin);
  63
  64   // Called when the google base url has changed.
  65   void OnGoogleURLChange(const std::string& google_base_url);
  66
  67  private:
  68   // Receives a copy of the TemplateURLService's keywords on the IO thread.
  69   void OnTemplateURLsLoaded(ScopedVector<TemplateURL> template_urls,
  70                             TemplateURL* default_provider);
  71
  72   // Stores information about the default search provider.
  73   void SetDefault(const TemplateURL* template_url);
  74
  75   // Sets up the loaded state and then lets clients know that the search
  76   // provider install state has been loaded.
  77   void OnLoadFailed();
  78
  79   // Does notifications to let clients know that the search provider
  80   // install state has been loaded.
  81   void NotifyLoaded();
  82
  83   // The original data source. Only accessed on the UI thread.
  84   TemplateURLService* template_url_service_;
  85
  86   // The list of closures to call after the load has finished. If empty, there
  87   // is no pending load.
  88   std::vector<base::Closure> closure_queue_;
  89
  90   // Holds results of a load that was done using this class.
  91   scoped_ptr<SearchHostToURLsMap> provider_map_;
  92
  93   // The list of template urls that are owned by the class.
  94   ScopedVector<TemplateURL> template_urls_;
  95
  96   // The security origin for the default search provider.
  97   std::string default_search_origin_;
  98
  99   // The google base url.
 100   std::string google_base_url_;
 101
 102   base::WeakPtrFactory<SearchProviderInstallData> weak_factory_;
 103
 104   DISALLOW_COPY_AND_ASSIGN(SearchProviderInstallData);
 105 };
 106
 107 #endif  // CHROME_BROWSER_SEARCH_ENGINES_SEARCH_PROVIDER_INSTALL_DATA_H_