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author | jorlow@chromium.org <jorlow@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529> | 2011-03-30 18:49:03 +0000 |
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committer | jorlow@chromium.org <jorlow@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529> | 2011-03-30 18:49:03 +0000 |
commit | 9e33808a26cbbb38008fcd10b74c4d05d78d0aa1 (patch) | |
tree | aa5b999df95bf5949265ae55e167a82033a959d7 /include/leveldb/status.h | |
parent | 4671a695fca3a8fb00cdf4609cd8238cf12ed13d (diff) | |
download | leveldb-9e33808a26cbbb38008fcd10b74c4d05d78d0aa1.tar.gz |
Fix last commit
git-svn-id: https://leveldb.googlecode.com/svn/trunk@19 62dab493-f737-651d-591e-8d6aee1b9529
Diffstat (limited to 'include/leveldb/status.h')
-rw-r--r-- | include/leveldb/status.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/include/leveldb/status.h b/include/leveldb/status.h new file mode 100644 index 0000000..47e3edf --- /dev/null +++ b/include/leveldb/status.h @@ -0,0 +1,86 @@ +// 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_ |