chrome/browser/search_engines/template_url_fetcher.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_TEMPLATE_URL_FETCHER_H_
   6 #define CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_FETCHER_H_
   7
   8 #include "base/memory/scoped_vector.h"
   9 #include "base/strings/string16.h"
  10 #include "components/keyed_service/core/keyed_service.h"
  11 #include "ui/gfx/native_widget_types.h"
  12
  13 class GURL;
  14 class Profile;
  15 class TemplateURL;
  16 class TemplateURLFetcherCallbacks;
  17
  18 namespace content {
  19 class WebContents;
  20 }
  21
  22 // TemplateURLFetcher is responsible for downloading OpenSearch description
  23 // documents, creating a TemplateURL from the OSDD, and adding the TemplateURL
  24 // to the TemplateURLService. Downloading is done in the background.
  25 //
  26 class TemplateURLFetcher : public KeyedService {
  27  public:
  28   enum ProviderType {
  29     AUTODETECTED_PROVIDER,
  30     EXPLICIT_PROVIDER  // Supplied by Javascript.
  31   };
  32
  33   // Creates a TemplateURLFetcher with the specified Profile.
  34   explicit TemplateURLFetcher(Profile* profile);
  35   virtual ~TemplateURLFetcher();
  36
  37   // If TemplateURLFetcher is not already downloading the OSDD for osdd_url,
  38   // it is downloaded. If successful and the result can be parsed, a TemplateURL
  39   // is added to the TemplateURLService. Takes ownership of |callbacks|.
  40   //
  41   // If |provider_type| is AUTODETECTED_PROVIDER, |keyword| must be non-empty,
  42   // and if there's already a non-replaceable TemplateURL in the model for
  43   // |keyword|, or we're already downloading an OSDD for this keyword, no
  44   // download is started.  If |provider_type| is EXPLICIT_PROVIDER, |keyword| is
  45   // ignored.
  46   //
  47   // |web_contents| specifies which WebContents displays the page the OSDD is
  48   // downloaded for. |web_contents| must not be NULL, except during tests.
  49   void ScheduleDownload(const base::string16& keyword,
  50                         const GURL& osdd_url,
  51                         const GURL& favicon_url,
  52                         content::WebContents* web_contents,
  53                         TemplateURLFetcherCallbacks* callbacks,
  54                         ProviderType provider_type);
  55
  56   // The current number of outstanding requests.
  57   int requests_count() const { return requests_.size(); }
  58
  59  private:
  60   // A RequestDelegate is created to download each OSDD. When done downloading
  61   // RequestCompleted is invoked back on the TemplateURLFetcher.
  62   class RequestDelegate;
  63   friend class RequestDelegate;
  64
  65   typedef ScopedVector<RequestDelegate> Requests;
  66
  67   Profile* profile() const { return profile_; }
  68
  69   // Invoked from the RequestDelegate when done downloading.
  70   void RequestCompleted(RequestDelegate* request);
  71
  72   Profile* profile_;
  73
  74   // In progress requests.
  75   Requests requests_;
  76
  77   DISALLOW_COPY_AND_ASSIGN(TemplateURLFetcher);
  78 };
  79
  80 #endif  // CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_FETCHER_H_