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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 bool InitByIdLookup(int64 id) OVERRIDE; | |
32 virtual bool InitByClientTagLookup(syncable::ModelType model_type, | |
33 const std::string& tag) OVERRIDE; | |
34 | |
35 // There is always a root node, so this can't fail. The root node is | |
36 // never mutable, so root lookup is only possible on a ReadNode. | |
37 void InitByRootLookup(); | |
38 | |
39 // Each server-created permanent node is tagged with a unique string. | |
40 // Look up the node with the particular tag. If it does not exist, | |
41 // return false. | |
42 bool InitByTagLookup(const std::string& tag); | |
43 | |
44 // Implementation of BaseNode's abstract virtual accessors. | |
45 virtual const syncable::Entry* GetEntry() const OVERRIDE; | |
46 virtual const BaseTransaction* GetTransaction() const OVERRIDE; | |
47 | |
48 protected: | |
49 ReadNode(); | |
50 | |
51 private: | |
52 void* operator new(size_t size); // Node is meant for stack use only. | |
53 | |
54 // The underlying syncable object which this class wraps. | |
55 syncable::Entry* entry_; | |
56 | |
57 // The sync API transaction that is the parent of this node. | |
58 const BaseTransaction* transaction_; | |
59 | |
60 DISALLOW_COPY_AND_ASSIGN(ReadNode); | |
61 }; | |
62 | |
63 } // namespace sync_api | |
64 | |
65 #endif // CHROME_BROWSER_SYNC_INTERNAL_API_READ_NODE_H_ | |
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