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1 // Copyright (c) 2012 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 CHROME_BROWSER_SYNC_INTERNAL_API_READ_NODE_H_ | |
6 #define CHROME_BROWSER_SYNC_INTERNAL_API_READ_NODE_H_ | |
7 #pragma once | |
8 | |
9 #include <string> | |
10 | |
11 #include "base/basictypes.h" | |
12 #include "base/compiler_specific.h" | |
13 #include "chrome/browser/sync/internal_api/base_node.h" | |
14 #include "sync/syncable/model_type.h" | |
15 | |
16 namespace sync_api { | |
17 | |
18 // ReadNode wraps a syncable::Entry to provide the functionality of a | |
19 // read-only BaseNode. | |
20 class ReadNode : public BaseNode { | |
21 public: | |
22 // Create an unpopulated ReadNode on the given transaction. Call some flavor | |
23 // of Init to populate the ReadNode with a database entry. | |
24 explicit ReadNode(const BaseTransaction* transaction); | |
25 virtual ~ReadNode(); | |
26 | |
27 // A client must use one (and only one) of the following Init variants to | |
28 // populate the node. | |
29 | |
30 // BaseNode implementation. | |
31 virtual InitByLookupResult InitByIdLookup(int64 id) OVERRIDE; | |
32 virtual InitByLookupResult InitByClientTagLookup( | |
33 syncable::ModelType model_type, | |
34 const std::string& tag) OVERRIDE; | |
35 | |
36 // There is always a root node, so this can't fail. The root node is | |
37 // never mutable, so root lookup is only possible on a ReadNode. | |
38 void InitByRootLookup(); | |
39 | |
40 // Each server-created permanent node is tagged with a unique string. | |
41 // Look up the node with the particular tag. If it does not exist, | |
42 // return false. | |
43 InitByLookupResult InitByTagLookup(const std::string& tag); | |
44 | |
45 // Implementation of BaseNode's abstract virtual accessors. | |
46 virtual const syncable::Entry* GetEntry() const OVERRIDE; | |
47 virtual const BaseTransaction* GetTransaction() const OVERRIDE; | |
48 | |
49 protected: | |
50 ReadNode(); | |
51 | |
52 private: | |
53 void* operator new(size_t size); // Node is meant for stack use only. | |
54 | |
55 // The underlying syncable object which this class wraps. | |
56 syncable::Entry* entry_; | |
57 | |
58 // The sync API transaction that is the parent of this node. | |
59 const BaseTransaction* transaction_; | |
60 | |
61 DISALLOW_COPY_AND_ASSIGN(ReadNode); | |
62 }; | |
63 | |
64 } // namespace sync_api | |
65 | |
66 #endif // CHROME_BROWSER_SYNC_INTERNAL_API_READ_NODE_H_ | |
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