Download resumption - Preliminary

content/browser/download/download_manager_impl.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 CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_
 
 #include <map>
 #include <set>
 
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/synchronization/lock.h"
 #include "content/browser/download/download_item_factory.h"
 #include "content/browser/download/download_item_impl_delegate.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/download_manager.h"
+#include "content/public/browser/download_url_parameters.h"
 
 class DownloadFileManager;
 class DownloadItemImpl;
 
+namespace content {
+class WebContents;
+}
+
 class CONTENT_EXPORT DownloadManagerImpl
     : public content::DownloadManager,
       private DownloadItemImplDelegate {
  public:
   // Caller guarantees that |file_manager| and |net_log| will remain valid
   // for the lifetime of DownloadManagerImpl (until Shutdown() is called).
   // |factory| may be a default constructed (null) scoped_ptr; if so,
   // the DownloadManagerImpl creates and takes ownership of the
   // default DownloadItemFactory.
   DownloadManagerImpl(DownloadFileManager* file_manager,
@@ skipping 55 matching lines @@
   typedef std::vector<DownloadItemImpl*> DownloadItemImplVector;
 
   // For testing.
   friend class DownloadManagerTest;
   friend class DownloadTest;
 
   friend class base::RefCountedThreadSafe<DownloadManagerImpl>;
 
   virtual ~DownloadManagerImpl();
 
+  virtual void ContinueStartingDownload(
+      int32 id,
+      content::DownloadInterruptReason reason);
+
   // Creates the download item.  Must be called on the UI thread.
   // Returns the |BoundNetLog| used by the |DownloadItem|.
   virtual net::BoundNetLog CreateDownloadItem(DownloadCreateInfo* info);
 
   // Does nothing if |download_id| is not an active download.
   void MaybeCompleteDownloadById(int download_id);
 
   // Determine if the download is ready for completion, i.e. has had
   // all data saved, and completed the filename determination and
   // history insertion.
   bool IsDownloadReadyForCompletion(DownloadItemImpl* download);
 
   // Show the download in the browser.
   void ShowDownloadInBrowser(DownloadItemImpl* download);
 
   // Get next download id.
   content::DownloadId GetNextId();
 
   // Called on the FILE thread to check the existence of a downloaded file.
   void CheckForFileRemovalOnFileThread(int32 download_id, const FilePath& path);
 
   // Called on the UI thread if the FILE thread detects the removal of
   // the downloaded file. The UI thread updates the state of the file
   // and then notifies this update to the file's observer.
   void OnFileRemovalDetected(int32 download_id);
 
+  // Retrieves the download from the |download_id|.
+  // Returns NULL if the download is not active.
+  content::DownloadItem* GetActiveDownload(int32 download_id);
+
   // Removes |download| from the active and in progress maps.
   // Called when the download is cancelled or has an error.
   // Does nothing if the download is not in the history DB.
   void RemoveFromActiveList(DownloadItemImpl* download);
 
   // Inform observers that the model has changed.
   void NotifyModelChanged();
 
   // Debugging routine to confirm relationship between below
   // containers; no-op if NDEBUG.
@@ skipping 26 matching lines @@
 
   // Called when Save Page As entry is committed to the persistent store.
   void OnSavePageItemAddedToPersistentStore(DownloadItemImpl* item);
 
   // Overridden from DownloadItemImplDelegate
   // (Note that |GetBrowserContext| are present in both interfaces.)
   virtual DownloadFileManager* GetDownloadFileManager() OVERRIDE;
   virtual bool ShouldOpenDownload(DownloadItemImpl* item) OVERRIDE;
   virtual bool ShouldOpenFileBasedOnExtension(const FilePath& path) OVERRIDE;
   virtual void CheckForFileRemoval(DownloadItemImpl* download_item) OVERRIDE;
-  virtual void MaybeCompleteDownload(DownloadItemImpl* download) OVERRIDE;
+  virtual void MaybeCompleteDownload(int32 download_id) OVERRIDE;
+  virtual void RestartInterruptedDownload(
+      DownloadItemImpl* download,
+      const content::DownloadUrlParameters::OnStartedCallback& callback)
+          OVERRIDE;
   virtual void DownloadStopped(DownloadItemImpl* download) OVERRIDE;
   virtual void DownloadCompleted(DownloadItemImpl* download) OVERRIDE;
   virtual void DownloadOpened(DownloadItemImpl* download) OVERRIDE;
   virtual void DownloadRemoved(DownloadItemImpl* download) OVERRIDE;
   virtual void DownloadRenamedToIntermediateName(
       DownloadItemImpl* download) OVERRIDE;
   virtual void DownloadRenamedToFinalName(DownloadItemImpl* download) OVERRIDE;
   virtual void AssertStateConsistent(DownloadItemImpl* download) const OVERRIDE;
 
   // Factory for creation of downloads items.
   scoped_ptr<content::DownloadItemFactory> factory_;
 
+  // Helper to get |WebContents| from a |DownloadItem|.
+  // Falls back to asking the delegate for one.
+  // May return NULL if it can't.
+  content::WebContents* GetWebContents(const content::DownloadItem* download);
+
   // |downloads_| is the owning set for all downloads known to the
   // DownloadManager.  This includes downloads started by the user in
   // this session, downloads initialized from the history system, and
   // "save page as" downloads.  All other DownloadItem containers in
   // the DownloadManager are maps; they do not own the DownloadItems.
   // Note that this is the only place (with any functional implications;
   // see save_page_downloads_ below) that "save page as" downloads are
   // kept, as the DownloadManager's only job is to hold onto those
   // until destruction.
   //
@@ skipping 28 matching lines @@
 
   // Allows an embedder to control behavior. Guaranteed to outlive this object.
   content::DownloadManagerDelegate* delegate_;
 
   net::NetLog* net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManagerImpl);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_