Não pode escolher mais do que 25 tópicos
Os tópicos devem começar com uma letra ou um número, podem incluir traços ('-') e podem ter até 35 caracteres.
86 linhas
2.5 KiB
86 linhas
2.5 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
//
|
|
// A Status encapsulates the result of an operation. It may indicate success,
|
|
// or it may indicate an error with an associated error message.
|
|
|
|
#ifndef STORAGE_LEVELDB_INCLUDE_STATUS_H_
|
|
#define STORAGE_LEVELDB_INCLUDE_STATUS_H_
|
|
|
|
#include <string>
|
|
#include <utility>
|
|
#include "leveldb/slice.h"
|
|
|
|
namespace leveldb {
|
|
|
|
class Status {
|
|
public:
|
|
// Create a success status.
|
|
Status() : state_(NULL) { }
|
|
~Status() { delete state_; }
|
|
|
|
// Copy the specified status.
|
|
Status(const Status& s);
|
|
void operator=(const Status& s);
|
|
|
|
// Return a success status.
|
|
static Status OK() { return Status(); }
|
|
|
|
// Return error status of an appropriate type.
|
|
static Status NotFound(const Slice& msg, const Slice& msg2 = Slice()) {
|
|
return Status(kNotFound, msg, Slice());
|
|
}
|
|
static Status Corruption(const Slice& msg, const Slice& msg2 = Slice()) {
|
|
return Status(kCorruption, msg, msg2);
|
|
}
|
|
static Status NotSupported(const Slice& msg, const Slice& msg2 = Slice()) {
|
|
return Status(kNotSupported, msg, msg2);
|
|
}
|
|
static Status InvalidArgument(const Slice& msg, const Slice& msg2 = Slice()) {
|
|
return Status(kInvalidArgument, msg, msg2);
|
|
}
|
|
static Status IOError(const Slice& msg, const Slice& msg2 = Slice()) {
|
|
return Status(kIOError, msg, msg2);
|
|
}
|
|
|
|
// Returns true iff the status indicates success.
|
|
bool ok() const { return (state_ == NULL); }
|
|
|
|
// Returns true iff the status indicates a NotFound error.
|
|
bool IsNotFound() const { return code() == kNotFound; }
|
|
|
|
// Return a string representation of this status suitable for printing.
|
|
// Returns the string "OK" for success.
|
|
std::string ToString() const;
|
|
|
|
private:
|
|
enum Code {
|
|
kOk = 0,
|
|
kNotFound = 1,
|
|
kCorruption = 2,
|
|
kNotSupported = 3,
|
|
kInvalidArgument = 4,
|
|
kIOError = 5,
|
|
};
|
|
Code code() const { return (state_ == NULL) ? kOk : state_->first; }
|
|
|
|
Status(Code code, const Slice& msg, const Slice& msg2);
|
|
|
|
typedef std::pair<Code, std::string> State;
|
|
State* state_;
|
|
};
|
|
|
|
inline Status::Status(const Status& s) {
|
|
state_ = (s.state_ == NULL) ? NULL : new State(*s.state_);
|
|
}
|
|
inline void Status::operator=(const Status& s) {
|
|
if (this != &s) {
|
|
delete state_;
|
|
state_ = (s.state_ == NULL) ? NULL : new State(*s.state_);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#endif // STORAGE_LEVELDB_INCLUDE_STATUS_H_
|