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Side by Side Diff: components/sync/api/attachments/attachment.h

Issue 2401223002: [Sync] Renaming sync/api* to sync/model*. (Closed)
Patch Set: Missed a comment in a DEPS file, and rebasing. Created 4 years, 2 months ago
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1 // Copyright 2014 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 COMPONENTS_SYNC_API_ATTACHMENTS_ATTACHMENT_H_
6 #define COMPONENTS_SYNC_API_ATTACHMENTS_ATTACHMENT_H_
7
8 #include <stdint.h>
9
10 #include <map>
11 #include <memory>
12 #include <vector>
13
14 #include "base/memory/ref_counted.h"
15 #include "base/memory/ref_counted_memory.h"
16 #include "components/sync/api/attachments/attachment_id.h"
17
18 namespace syncer {
19
20 // A blob of in-memory data attached to a sync item.
21 //
22 // While Attachment objects themselves aren't immutable (they are assignable)
23 // the data they wrap is immutable.
24 //
25 // It is cheap to copy Attachments. Feel free to store and return by value.
26 class Attachment {
27 public:
28 Attachment(const Attachment& other);
29 ~Attachment();
30
31 // Default copy and assignment are welcome.
32
33 // Creates an attachment with a unique id and the supplied data.
34 //
35 // Used when creating a brand new attachment.
36 static Attachment Create(const scoped_refptr<base::RefCountedMemory>& data);
37
38 // Creates an attachment with the supplied id and data.
39 //
40 // Used when you want to recreate a specific attachment. E.g. creating a local
41 // copy of an attachment that already exists on the sync server.
42 static Attachment CreateFromParts(
43 const AttachmentId& id,
44 const scoped_refptr<base::RefCountedMemory>& data);
45
46 // Returns this attachment's id.
47 const AttachmentId& GetId() const;
48
49 // Returns this attachment's data.
50 const scoped_refptr<base::RefCountedMemory>& GetData() const;
51
52 // Returns precomputed crc32c hash of data. In ideal case this hash is
53 // computed when attachment is first created. It is then passed around through
54 // local attachment store and attachment server. Crc is verified when
55 // attachment is downloaded from server or loaded from local storage.
56 uint32_t GetCrc32c() const;
57
58 private:
59 AttachmentId id_;
60 scoped_refptr<base::RefCountedMemory> data_;
61
62 Attachment(const AttachmentId& id,
63 const scoped_refptr<base::RefCountedMemory>& data);
64 };
65
66 typedef std::vector<Attachment> AttachmentList;
67 typedef std::map<AttachmentId, Attachment> AttachmentMap;
68
69 } // namespace syncer
70
71 #endif // COMPONENTS_SYNC_API_ATTACHMENTS_ATTACHMENT_H_
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