1 files changed, 49 insertions, 0 deletions
diff --git a/chrome/common/pref_store.h b/chrome/common/pref_store.h
new file mode 100644
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+++ b/chrome/common/pref_store.h
@@ -0,0 +1,49 @@
+// Copyright (c) 2010 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 CHROME_COMMON_PREF_STORE_H_
+#define CHROME_COMMON_PREF_STORE_H_
+
+class DictionaryValue;
+
+// This is an abstract interface for reading and writing from/to a persistent
+// preference store, used by |PrefService|. An implementation using a JSON file
+// can be found in |JsonPrefStore|, while an implementation without any backing
+// store (currently used for testing) can be found in |DummyPrefStore|.
+class PrefStore {
+ public:
+  // Unique integer code for each type of error so we can report them
+  // distinctly in a histogram.
+  // NOTE: Don't change the order here as it will change the server's meaning
+  // of the histogram.
+  enum PrefReadError {
+    PREF_READ_ERROR_NONE = 0,
+    PREF_READ_ERROR_JSON_PARSE,
+    PREF_READ_ERROR_JSON_TYPE,
+    PREF_READ_ERROR_ACCESS_DENIED,
+    PREF_READ_ERROR_FILE_OTHER,
+    PREF_READ_ERROR_FILE_LOCKED,
+    PREF_READ_ERROR_NO_FILE,
+    PREF_READ_ERROR_JSON_REPEAT,
+    PREF_READ_ERROR_OTHER
+  };
+
+  virtual ~PrefStore() { }
+
+  // Whether the store is in a pseudo-read-only mode where changes are not
+  // actually persisted to disk.  This happens in some cases when there are
+  // read errors during startup.
+  virtual bool ReadOnly() { return true; }
+
+  virtual DictionaryValue* prefs() = 0;
+
+  virtual PrefReadError ReadPrefs() = 0;
+
+  virtual bool WritePrefs() { return true; }
+
+  virtual void ScheduleWritePrefs() { }
+};
+
+#endif  // CHROME_COMMON_PREF_STORE_H_
+