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// Copyright 2012 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_SYNCABLE_ENTRY_H_
#define SYNC_SYNCABLE_ENTRY_H_
#include "sync/base/sync_export.h"
#include "sync/syncable/entry_kernel.h"
namespace syncer {
class Cryptographer;
class ReadNode;
namespace syncable {
class Directory;
class BaseTransaction;
// A read-only meta entry
// Instead of:
// Entry e = transaction.GetById(id);
// use:
// Entry e(transaction, GET_BY_ID, id);
//
// Why? The former would require a copy constructor, and it would be difficult
// to enforce that an entry never outlived its transaction if there were a copy
// constructor.
enum GetById {
GET_BY_ID
};
enum GetByClientTag {
GET_BY_CLIENT_TAG
};
enum GetByServerTag {
GET_BY_SERVER_TAG
};
enum GetByHandle {
GET_BY_HANDLE
};
class SYNC_EXPORT Entry {
public:
// After constructing, you must check good() to test whether the Get
// succeeded.
Entry(BaseTransaction* trans, GetByHandle, int64 handle);
Entry(BaseTransaction* trans, GetById, const Id& id);
Entry(BaseTransaction* trans, GetByServerTag, const std::string& tag);
Entry(BaseTransaction* trans, GetByClientTag, const std::string& tag);
bool good() const { return 0 != kernel_; }
BaseTransaction* trans() const { return basetrans_; }
// Field accessors.
inline int64 Get(MetahandleField field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline Id Get(IdField field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline int64 Get(Int64Field field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline const base::Time& Get(TimeField field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline int64 Get(BaseVersion field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline bool Get(IndexedBitField field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline bool Get(IsDelField field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline bool Get(BitField field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
const std::string& Get(StringField field) const;
inline const sync_pb::EntitySpecifics& Get(ProtoField field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline const NodeOrdinal& Get(OrdinalField field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
inline bool Get(BitTemp field) const {
DCHECK(kernel_);
return kernel_->ref(field);
}
ModelType GetServerModelType() const;
ModelType GetModelType() const;
Id GetPredecessorId() const;
Id GetSuccessorId() const;
inline bool ExistsOnClientBecauseNameIsNonEmpty() const {
DCHECK(kernel_);
return !kernel_->ref(NON_UNIQUE_NAME).empty();
}
inline bool IsRoot() const {
DCHECK(kernel_);
return kernel_->ref(ID).IsRoot();
}
Directory* dir() const;
const EntryKernel GetKernelCopy() const {
return *kernel_;
}
// Compute a local predecessor position for |update_item|, based on its
// absolute server position. The returned ID will be a valid predecessor
// under SERVER_PARENT_ID that is consistent with the
// SERVER_POSITION_IN_PARENT ordering.
Id ComputePrevIdFromServerPosition(const Id& parent_id) const;
// Dumps all entry info into a DictionaryValue and returns it.
// Transfers ownership of the DictionaryValue to the caller.
base::DictionaryValue* ToValue(Cryptographer* cryptographer) const;
protected: // Don't allow creation on heap, except by sync API wrappers.
void* operator new(size_t size) { return (::operator new)(size); }
inline explicit Entry(BaseTransaction* trans)
: basetrans_(trans),
kernel_(NULL) { }
protected:
BaseTransaction* const basetrans_;
EntryKernel* kernel_;
private:
friend class Directory;
friend class syncer::ReadNode;
friend std::ostream& operator << (std::ostream& s, const Entry& e);
DISALLOW_COPY_AND_ASSIGN(Entry);
};
std::ostream& operator<<(std::ostream& os, const Entry& entry);
} // namespace syncable
} // namespace syncer
#endif // SYNC_SYNCABLE_ENTRY_H_
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