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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SYNC_API_ATTACHMENTS_ATTACHMENT_H_
#define SYNC_API_ATTACHMENTS_ATTACHMENT_H_
#include <map>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/ref_counted_memory.h"
#include "base/memory/scoped_ptr.h"
#include "sync/api/attachments/attachment_id.h"
#include "sync/base/sync_export.h"
namespace syncer {
// A blob of in-memory data attached to a sync item.
//
// While Attachment objects themselves aren't immutable (they are assignable)
// the data they wrap is immutable.
//
// It is cheap to copy Attachments. Feel free to store and return by value.
class SYNC_EXPORT Attachment {
public:
~Attachment();
// Default copy and assignment are welcome.
// Creates an attachment with a unique id and the supplied data.
//
// Used when creating a brand new attachment.
static Attachment Create(const scoped_refptr<base::RefCountedMemory>& data);
// Creates an attachment with the supplied id and data.
//
// Used when you want to recreate a specific attachment. E.g. creating a local
// copy of an attachment that already exists on the sync server.
static Attachment CreateFromParts(
const AttachmentId& id,
const scoped_refptr<base::RefCountedMemory>& data);
// Returns this attachment's id.
const AttachmentId& GetId() const;
// Returns this attachment's data.
const scoped_refptr<base::RefCountedMemory>& GetData() const;
// Returns precomputed crc32c hash of data. In ideal case this hash is
// computed when attachment is first created. It is then passed around through
// local attachment store and attachment server. Crc is verified when
// attachment is downloaded from server or loaded from local storage.
uint32_t GetCrc32c() const;
private:
AttachmentId id_;
scoped_refptr<base::RefCountedMemory> data_;
Attachment(const AttachmentId& id,
const scoped_refptr<base::RefCountedMemory>& data);
};
typedef std::vector<syncer::Attachment> AttachmentList;
typedef std::map<AttachmentId, Attachment> AttachmentMap;
} // namespace syncer
#endif // SYNC_API_ATTACHMENTS_ATTACHMENT_H_
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