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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 2012 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 #ifndef SYNC_INTERNAL_API_PUBLIC_BASE_NODE_ORDINAL_H_ | 5 #ifndef SYNC_INTERNAL_API_PUBLIC_BASE_NODE_ORDINAL_H_ |
6 #define SYNC_INTERNAL_API_PUBLIC_BASE_NODE_ORDINAL_H_ | 6 #define SYNC_INTERNAL_API_PUBLIC_BASE_NODE_ORDINAL_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include "base/basictypes.h" |
| 9 #include "sync/base/sync_export.h" |
9 #include "sync/internal_api/public/base/ordinal.h" | 10 #include "sync/internal_api/public/base/ordinal.h" |
10 | 11 |
11 namespace syncer { | 12 namespace syncer { |
12 | 13 |
13 // A NodeOrdinal is an Ordinal whose internal value comes from the | 14 // A NodeOrdinal is an Ordinal whose internal value comes from the |
14 // ordinal_in_parent field of SyncEntity (see sync.proto). It uses | 15 // ordinal_in_parent field of SyncEntity (see sync.proto). It uses |
15 // the entire uint8 range for backwards compatibility with the old | 16 // the entire uint8 range for backwards compatibility with the old |
16 // int64-based positioning. | 17 // int64-based positioning. |
17 | 18 |
18 struct NodeOrdinalTraits { | 19 struct NodeOrdinalTraits { |
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35 NodeOrdinalHasCorrectMidDigitValue); | 36 NodeOrdinalHasCorrectMidDigitValue); |
36 COMPILE_ASSERT(NodeOrdinal::kMaxDigitValue == 255, | 37 COMPILE_ASSERT(NodeOrdinal::kMaxDigitValue == 255, |
37 NodeOrdinalHasCorrectMaxDigitValue); | 38 NodeOrdinalHasCorrectMaxDigitValue); |
38 COMPILE_ASSERT(NodeOrdinal::kRadix == 256, | 39 COMPILE_ASSERT(NodeOrdinal::kRadix == 256, |
39 NodeOrdinalHasCorrectRadix); | 40 NodeOrdinalHasCorrectRadix); |
40 | 41 |
41 // Converts an int64 position (usually from the position_in_parent | 42 // Converts an int64 position (usually from the position_in_parent |
42 // field of SyncEntity) to a NodeOrdinal. This transformation | 43 // field of SyncEntity) to a NodeOrdinal. This transformation |
43 // preserves the ordering relation: a < b under integer ordering if | 44 // preserves the ordering relation: a < b under integer ordering if |
44 // and only if Int64ToNodeOrdinal(a) < Int64ToNodeOrdinal(b). | 45 // and only if Int64ToNodeOrdinal(a) < Int64ToNodeOrdinal(b). |
45 NodeOrdinal Int64ToNodeOrdinal(int64 x); | 46 SYNC_EXPORT_PRIVATE NodeOrdinal Int64ToNodeOrdinal(int64 x); |
46 | 47 |
47 // The inverse of Int64ToNodeOrdinal. This conversion is, in general, | 48 // The inverse of Int64ToNodeOrdinal. This conversion is, in general, |
48 // lossy: NodeOrdinals can have arbitrary fidelity, while numeric | 49 // lossy: NodeOrdinals can have arbitrary fidelity, while numeric |
49 // positions contain only 64 bits of information (in fact, this is the | 50 // positions contain only 64 bits of information (in fact, this is the |
50 // reason we've moved away from them). | 51 // reason we've moved away from them). |
51 int64 NodeOrdinalToInt64(const NodeOrdinal& ordinal); | 52 SYNC_EXPORT_PRIVATE int64 NodeOrdinalToInt64(const NodeOrdinal& ordinal); |
52 | 53 |
53 } // namespace syncer | 54 } // namespace syncer |
54 | 55 |
55 #endif // SYNC_INTERNAL_API_PUBLIC_BASE_NODE_ORDINAL_H_ | 56 #endif // SYNC_INTERNAL_API_PUBLIC_BASE_NODE_ORDINAL_H_ |
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