text: /*    Copyright 2012 10gen Inc.
   *
   *    Licensed under the Apache License, Version 2.0 (the "License");
   *    you may not use this file except in compliance with the License.
   *    You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   *    Unless required by applicable law or agreed to in writing, software
   *    distributed under the License is distributed on an "AS IS" BASIS,
   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   */
  
  #include "mongo/base/status.h"
  
  #include <ostream>
  #include <sstream>
  
  namespace mongo {
  
      Status::ErrorInfo* Status::getOKInfo() {
          static ErrorInfo* okInfo = new ErrorInfo(ErrorCodes::OK, "", 0);
          return okInfo;
      }
  
      Status::ErrorInfo::ErrorInfo(ErrorCodes::Error aCode, const std::string& aReason, int aLocation)
          : code(aCode), reason(aReason), location(aLocation) {}
  
      Status::Status(ErrorCodes::Error code, const char* reason, int location) {
          _error = new ErrorInfo(code, std::string(reason), location);
          ref(_error);
      }
  
      Status::Status(ErrorCodes::Error code, const std::string& reason, int location) {
          _error = new ErrorInfo(code, reason, location);
          ref(_error);
      }
  
      Status::Status(ErrorInfo* info) {
          _error = info;
          ref(info);
      }
  
      Status::Status(const Status& other) {
          ref(other._error);
          _error = other._error;
      }
  
      Status& Status::operator=(const Status& other) {
          ref(other._error);
          unref(_error);
          _error = other._error;
          return *this;
      }
  
      Status::~Status() {
          unref(_error);
      }
  
      bool Status::compare(const Status& other) const {
          return _error->code == other._error->code &&
                 _error->location == other._error->location;
      }
  
      bool Status::operator==(const Status& other) const {
          return compare(other);
      }
  
      bool Status::operator!=(const Status& other) const {
          return ! compare(other);
      }
  
      bool Status::compareCode(const ErrorCodes::Error other) const {
          return _error->code == other;
      }
  
      bool Status::operator==(const ErrorCodes::Error other) const {
          return compareCode(other);
      }
  
      bool Status::operator!=(const ErrorCodes::Error other) const {
          return ! compareCode(other);
      }
  
      void Status::ref(ErrorInfo* error) {
          // okInfo is never deallocated, so no need to bump ref here.
          if (error == getOKInfo()) {
              return;
          }
          error->refs.fetchAndAdd(1);
      }
  
      void Status::unref(ErrorInfo* error) {
          // okInfo is never deallocated.
          if (error == getOKInfo()) {
              return;
          }
  
          if (error->refs.subtractAndFetch(1) == 0) {
              delete error;
          }
      }
  
      std::ostream& operator<<(std::ostream& os, const Status& status) {
          return os << status.codeString() << " " << status.reason();
      }
  
      std::ostream& operator<<(std::ostream& os, ErrorCodes::Error code) {
          return os << ErrorCodes::errorString(code);
      }
  
      std::string Status::toString() const {
          std::ostringstream ss;
          ss << codeString();
          if ( !isOK() )
              ss << " " << reason();
          if ( location() != 0 )
              ss << " @ " << location();
          return ss.str();
      }
  
  namespace {
      /// Ensure that Status::OK() is called at least once in single threaded context,
      /// by creating a global variable whose static initializer calls it.
      Status okStatusInstance = Status::OK();
  }  // namespace
  
  } // namespace mongo
  