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      1 // Copyright 2013 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 COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_URL_FETCHER_H_
      6 #define COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_URL_FETCHER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/callback.h"
     11 #include "net/url_request/url_fetcher.h"
     12 #include "net/url_request/url_fetcher_delegate.h"
     13 #include "net/url_request/url_request_context_getter.h"
     14 
     15 namespace dom_distiller {
     16 
     17 class DistillerURLFetcher;
     18 
     19 // Class for creating a DistillerURLFetcher.
     20 class DistillerURLFetcherFactory {
     21  public:
     22   explicit DistillerURLFetcherFactory(
     23       net::URLRequestContextGetter* context_getter);
     24   virtual ~DistillerURLFetcherFactory() {}
     25   virtual DistillerURLFetcher* CreateDistillerURLFetcher() const;
     26 
     27  private:
     28   net::URLRequestContextGetter* context_getter_;
     29 };
     30 
     31 // This class fetches a URL, and notifies the caller when the operation
     32 // completes or fails. If the request fails, an empty string will be returned.
     33 class DistillerURLFetcher : public net::URLFetcherDelegate {
     34  public:
     35   explicit DistillerURLFetcher(net::URLRequestContextGetter* context_getter);
     36   virtual ~DistillerURLFetcher();
     37 
     38   // Indicates when a fetch is done.
     39   typedef base::Callback<void(const std::string& data)> URLFetcherCallback;
     40 
     41   // Fetches a |url|. Notifies when the fetch is done via |callback|.
     42   virtual void FetchURL(const std::string& url,
     43                         const URLFetcherCallback& callback);
     44 
     45  protected:
     46   virtual net::URLFetcher* CreateURLFetcher(
     47       net::URLRequestContextGetter* context_getter,
     48       const std::string& url);
     49 
     50  private:
     51   // net::URLFetcherDelegate:
     52   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
     53 
     54   scoped_ptr<net::URLFetcher> url_fetcher_;
     55   URLFetcherCallback callback_;
     56   net::URLRequestContextGetter* context_getter_;
     57   DISALLOW_COPY_AND_ASSIGN(DistillerURLFetcher);
     58 };
     59 
     60 }  //  namespace dom_distiller
     61 
     62 #endif  // COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_URL_FETCHER_H_
     63