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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 CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_HOST_H_
      6 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_HOST_H_
      7 
      8 #include <map>
      9 
     10 #include "base/memory/ref_counted.h"
     11 #include "base/strings/nullable_string16.h"
     12 #include "base/strings/string16.h"
     13 #include "content/common/content_export.h"
     14 #include "content/common/dom_storage/dom_storage_types.h"
     15 
     16 class GURL;
     17 
     18 namespace content {
     19 
     20 class DOMStorageContextImpl;
     21 class DOMStorageHost;
     22 class DOMStorageNamespace;
     23 class DOMStorageArea;
     24 
     25 // One instance is allocated in the main process for each client process.
     26 // Used by DOMStorageMessageFilter in Chrome and by SimpleDOMStorage in DRT.
     27 // This class is single threaded, and performs blocking file reads/writes,
     28 // so it shouldn't be used on chrome's IO thread.
     29 // See class comments for DOMStorageContextImpl for a larger overview.
     30 class CONTENT_EXPORT DOMStorageHost {
     31  public:
     32   explicit DOMStorageHost(DOMStorageContextImpl* context);
     33   ~DOMStorageHost();
     34 
     35   bool OpenStorageArea(int connection_id, int namespace_id,
     36                        const GURL& origin);
     37   void CloseStorageArea(int connection_id);
     38   bool ExtractAreaValues(int connection_id, DOMStorageValuesMap* map);
     39   unsigned GetAreaLength(int connection_id);
     40   base::NullableString16 GetAreaKey(int connection_id, unsigned index);
     41   base::NullableString16 GetAreaItem(int connection_id,
     42                                      const base::string16& key);
     43   bool SetAreaItem(int connection_id, const base::string16& key,
     44                    const base::string16& value, const GURL& page_url,
     45                    base::NullableString16* old_value);
     46   bool RemoveAreaItem(int connection_id, const base::string16& key,
     47                   const GURL& page_url,
     48                   base::string16* old_value);
     49   bool ClearArea(int connection_id, const GURL& page_url);
     50   bool HasAreaOpen(int namespace_id, const GURL& origin) const;
     51 
     52  private:
     53   // Struct to hold references needed for areas that are open
     54   // within our associated client process.
     55   struct NamespaceAndArea {
     56     scoped_refptr<DOMStorageNamespace> namespace_;
     57     scoped_refptr<DOMStorageArea> area_;
     58     NamespaceAndArea();
     59     ~NamespaceAndArea();
     60   };
     61   typedef std::map<int, NamespaceAndArea > AreaMap;
     62 
     63   DOMStorageArea* GetOpenArea(int connection_id);
     64   DOMStorageNamespace* GetNamespace(int connection_id);
     65 
     66   scoped_refptr<DOMStorageContextImpl> context_;
     67   AreaMap connections_;
     68 };
     69 
     70 }  // namespace content
     71 
     72 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_HOST_H_
     73