Index: components/sessions/content/extended_info_handler.h |
diff --git a/components/sessions/content/extended_info_handler.h b/components/sessions/content/extended_info_handler.h |
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+// Copyright 2016 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 COMPONENTS_SESSIONS_CONTENT_EXTENDED_INFO_HANDLER_H_ |
+#define COMPONENTS_SESSIONS_CONTENT_EXTENDED_INFO_HANDLER_H_ |
+ |
+#include <string> |
+ |
+#include "components/sessions/core/sessions_export.h" |
+ |
+namespace content { |
+class NavigationEntry; |
+} |
+ |
+namespace sessions { |
+ |
+// This interface is used to store and retrieve arbitrary key/value pairs for |
+// a NavigationEntry that are not a core part of NavigationEntry. |
+// WARNING: implementations must deal with versioning. In particular |
+// RestoreExtendedInfo() may be called with data from a previous version of |
+// Chrome. |
+class SESSIONS_EXPORT ExtendedInfoHandler { |
+ public: |
+ ExtendedInfoHandler() {} |
+ virtual ~ExtendedInfoHandler() {} |
+ |
+ // Returns the data to write to disk for the specified NavigationEntry. |
+ virtual std::string GetExtendedInfo( |
+ const content::NavigationEntry& entry) const = 0; |
+ |
+ // Restores |info| which was obtained from a previous call to |
+ // GetExtendedInfo() to a NavigationEntry. |
+ virtual void RestoreExtendedInfo(const std::string& info, |
+ content::NavigationEntry* entry) = 0; |
+}; |
+ |
+} // namespace sessions |
+ |
+#endif // COMPONENTS_SESSIONS_CONTENT_EXTENDED_INFO_HANDLER_H_ |