Upstream version 7.36.149.0

[platform/framework/web/crosswalk.git] / src / chrome / browser / prefs / pref_hash_store.h

diff --git a/src/chrome/browser/prefs/pref_hash_store.h b/src/chrome/browser/prefs/pref_hash_store.h
index 6f1dcc5..a6d9727 100644 (file)
--- a/src/chrome/browser/prefs/pref_hash_store.h
+++ b/src/chrome/browser/prefs/pref_hash_store.h
@@ -5,62 +5,23 @@
 #ifndef CHROME_BROWSER_PREFS_PREF_HASH_STORE_H_
 #define CHROME_BROWSER_PREFS_PREF_HASH_STORE_H_
 
-#include <string>
-
 #include "base/memory/scoped_ptr.h"
 
-namespace base {
-class Value;
-}  // namespace base
-
-namespace internals {
-
-// Hash of hashes for each profile, used to validate the existing hashes when
-// debating whether an unknown value is to be trusted, will be stored as a
-// string under
-// |kProfilePreferenceHashes|.|kHashOfHashesPref|.|hash_stored_id_|.
-const char kHashOfHashesPref[] = "hash_of_hashes";
+class PrefHashStoreTransaction;
 
-}  // namespace internals
-
-// Stores hashes of and verifies preference values. To use, first call
-// |InitializeTrackedValue| with each preference that should be tracked. Then
-// call |OnPrefValueChanged| to update the hash store when preference values
-// change.
+// Stores hashes of and verifies preference values via
+// PrefHashStoreTransactions.
 class PrefHashStore {
  public:
   virtual ~PrefHashStore() {}
 
-  enum ValueState {
-    // The preference value corresponds to its stored hash.
-    UNCHANGED,
-    // The preference has been cleared since the last hash.
-    CLEARED,
-    // The preference value corresponds to its stored hash, which was calculated
-    // using a legacy hash algorithm.
-    MIGRATED,
-    // The preference value has been changed since the last hash.
-    CHANGED,
-    // No stored hash exists for the preference value.
-    UNTRUSTED_UNKNOWN_VALUE,
-    // No stored hash exists for the preference value, but the current set of
-    // hashes stored is trusted and thus this value can safely be seeded. This
-    // happens when all hashes are already properly seeded and a newly
-    // tracked value needs to be seeded). NULL values are inherently trusted as
-    // well.
-    TRUSTED_UNKNOWN_VALUE,
-  };
-
-  // Determines if the hash store has been initialized (contains any values).
-  virtual bool IsInitialized() const = 0;
-
-  // Checks |initial_value| against the existing stored value hash.
-  virtual ValueState CheckValue(
-      const std::string& path, const base::Value* initial_value) const = 0;
+  // Returns a PrefHashStoreTransaction which can be used to perform a series
+  // of checks/transformations on the hash store.
+  virtual scoped_ptr<PrefHashStoreTransaction> BeginTransaction() = 0;
 
-  // Stores a hash of the current |value| of the preference at |path|.
-  virtual void StoreHash(const std::string& path,
-                         const base::Value* value) = 0;
+  // Commits this store to disk if it has changed since the last call to this
+  // method.
+  virtual void CommitPendingWrite() = 0;
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_HASH_STORE_H_