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      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/browser_context_keyed_service/browser_context_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 BrowserContextKeyedService {
     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 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_
     81