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Side by Side Diff: base/prefs/pref_filter.h

Issue 1645073005: Revert of Move base/prefs to components/prefs (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 10 months ago
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1 // Copyright 2013 The Chromium Authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // TODO(brettw) remove this forwarding header when prefs is completely moved to 5 #ifndef BASE_PREFS_PREF_FILTER_H_
6 // components. 6 #define BASE_PREFS_PREF_FILTER_H_
7 #include "components/prefs/pref_filter.h" 7
8 #include <string>
9
10 #include "base/callback_forward.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "base/prefs/base_prefs_export.h"
13
14 namespace base {
15 class DictionaryValue;
16 class Value;
17 } // namespace base
18
19 // Filters preferences as they are loaded from disk or updated at runtime.
20 // Currently supported only by JsonPrefStore.
21 class BASE_PREFS_EXPORT PrefFilter {
22 public:
23 // A callback to be invoked when |prefs| have been read (and possibly
24 // pre-modified) and are now ready to be handed back to this callback's
25 // builder. |schedule_write| indicates whether a write should be immediately
26 // scheduled (typically because the |prefs| were pre-modified).
27 typedef base::Callback<void(scoped_ptr<base::DictionaryValue> prefs,
28 bool schedule_write)> PostFilterOnLoadCallback;
29
30 virtual ~PrefFilter() {}
31
32 // This method is given ownership of the |pref_store_contents| read from disk
33 // before the underlying PersistentPrefStore gets to use them. It must hand
34 // them back via |post_filter_on_load_callback|, but may modify them first.
35 // Note: This method is asynchronous, which may make calls like
36 // PersistentPrefStore::ReadPrefs() asynchronous. The owner of filtered
37 // PersistentPrefStores should handle this to make the reads look synchronous
38 // to external users (see SegregatedPrefStore::ReadPrefs() for an example).
39 virtual void FilterOnLoad(
40 const PostFilterOnLoadCallback& post_filter_on_load_callback,
41 scoped_ptr<base::DictionaryValue> pref_store_contents) = 0;
42
43 // Receives notification when a pref store value is changed, before Observers
44 // are notified.
45 virtual void FilterUpdate(const std::string& path) = 0;
46
47 // Receives notification when the pref store is about to serialize data
48 // contained in |pref_store_contents| to a string. Modifications to
49 // |pref_store_contents| will be persisted to disk and also affect the
50 // in-memory state.
51 virtual void FilterSerializeData(
52 base::DictionaryValue* pref_store_contents) = 0;
53 };
54
55 #endif // BASE_PREFS_PREF_FILTER_H_
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