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status.h
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status.h
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// 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.
//
// Multiple threads can invoke const methods on a Status without
// external synchronization, but if any of the threads may call a
// non-const method, all threads accessing the same Status must use
// external synchronization.
// Modified by John R. Bandela
#ifndef JRB_MODIFIED_STORAGE_LEVELDB_INCLUDE_STATUS_H_
#define JRB_MODIFIED_STORAGE_LEVELDB_INCLUDE_STATUS_H_
#include <string>
#include "slice.h"
#include <cstdint>
namespace leveldb_cc{
// Simple status that just has code
struct status_cross_type;
class Status {
friend void modify_status(Status& s, const status_cross_type&);
friend void status_to_cross(const Status& s, status_cross_type&);
public:
// Create a success status.
Status() : state_(NULL) { }
~Status()throw() { 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, msg2);
}
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; }
// Returns true iff the status indicates a Corruption error.
bool IsCorruption() const { return code() == kCorruption; }
// Returns true iff the status indicates an IOError.
bool IsIOError() const { return code() == kIOError; }
// Return a string representation of this status suitable for printing.
// Returns the string "OK" for success.
std::string ToString() const;
private:
// OK status has a NULL state_. Otherwise, state_ is a new[] array
// of the following form:
// state_[0..3] == length of message
// state_[4] == code
// state_[5..] == message
const char* state_;
enum Code {
kOk = 0,
kNotFound = 1,
kCorruption = 2,
kNotSupported = 3,
kInvalidArgument = 4,
kIOError = 5
};
Code code() const {
return (state_ == NULL) ? kOk : static_cast<Code>(state_[4]);
}
Status(Code code, const Slice& msg, const Slice& msg2);
static const char* CopyState(const char* s);
};
inline Status::Status(const Status& s) {
state_ = (s.state_ == NULL) ? NULL : CopyState(s.state_);
}
inline void Status::operator=(const Status& s) {
// The following condition catches both aliasing (when this == &s),
// and the common case where both s and *this are ok.
if (state_ != s.state_) {
delete[] state_;
state_ = (s.state_ == NULL) ? NULL : CopyState(s.state_);
}
}
inline const char* Status::CopyState(const char* state) {
std::uint32_t size;
memcpy(&size, state, sizeof(size));
char* result = new char[size + 5];
memcpy(result, state, size + 5);
return result;
}
inline Status::Status(Code code, const Slice& msg, const Slice& msg2) {
assert(code != kOk);
const uint32_t len1 = msg.size();
const uint32_t len2 = msg2.size();
const uint32_t size = len1 + (len2 ? (2 + len2) : 0);
char* result = new char[size + 5];
memcpy(result, &size, sizeof(size));
result[4] = static_cast<char>(code);
memcpy(result + 5, msg.data(), len1);
if (len2) {
result[5 + len1] = ':';
result[6 + len1] = ' ';
memcpy(result + 7 + len1, msg2.data(), len2);
}
state_ = result;
}
inline std::string Status::ToString() const {
using std::uint32_t;
if (state_ == NULL) {
return "OK";
} else {
char tmp[30];
const char* type;
switch (code()) {
case kOk:
type = "OK";
break;
case kNotFound:
type = "NotFound: ";
break;
case kCorruption:
type = "Corruption: ";
break;
case kNotSupported:
type = "Not implemented: ";
break;
case kInvalidArgument:
type = "Invalid argument: ";
break;
case kIOError:
type = "IO error: ";
break;
default:
// Got rid of snprintf call at cost of not knowing code
type = "Unknown code";
break;
}
std::string result(type);
uint32_t length;
memcpy(&length, state_, sizeof(length));
result.append(state_ + 5, length);
return result;
}
}
#pragma pack(push,1)
struct status_cross_type{
const char* state;
};
#pragma pack(pop)
inline void modify_status(Status& s, const status_cross_type& sc){
s.state_ = nullptr;
if(sc.state){
s.state_ = Status::CopyState(sc.state);
}
}
inline void status_to_cross(const Status& s, status_cross_type& sc){
sc.state = nullptr;
if(s.state_){
sc.state = Status::CopyState(s.state_);
}
}
}
namespace cross_compiler_interface{
template<>
struct cross_conversion<leveldb_cc::Status>{
typedef leveldb_cc::Status original_type;
typedef leveldb_cc::status_cross_type converted_type;
static converted_type to_converted_type(const original_type& s){
leveldb_cc::status_cross_type ret;
leveldb_cc::status_to_cross(s,ret);
return ret;
}
static original_type to_original_type(const leveldb_cc::status_cross_type& sc){
leveldb_cc::Status ret;
leveldb_cc::modify_status(ret,sc);
return ret;
}
};
}
#endif // JRB_MODIFIED_STORAGE_LEVELDB_INCLUDE_STATUS_H_