libminifi/include/Exception.h

/**
 * @file Exception.h
 * Exception class declaration
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
#ifndef __EXCEPTION_H__
#define __EXCEPTION_H__

#include <sstream>
#include <exception>
#include <stdexcept>
#include <errno.h>
#include <string.h>

namespace org {
namespace apache {
namespace nifi {
namespace minifi {

// ExceptionType 
enum ExceptionType {
  FILE_OPERATION_EXCEPTION = 0,
  FLOW_EXCEPTION,
  PROCESSOR_EXCEPTION,
  PROCESS_SESSION_EXCEPTION,
  PROCESS_SCHEDULE_EXCEPTION,
  SITE2SITE_EXCEPTION,
  GENERAL_EXCEPTION,
  REGEX_EXCEPTION,
  MAX_EXCEPTION
};

// Exception String 
static const char *ExceptionStr[MAX_EXCEPTION] = { "File Operation", "Flow File Operation", "Processor Operation", "Process Session Operation", "Process Schedule Operation", "Site2Site Protocol",
    "General Operation", "Regex Operation" };

// Exception Type to String 
inline const char *ExceptionTypeToString(ExceptionType type) {
  if (type < MAX_EXCEPTION)
    return ExceptionStr[type];
  else
    return NULL;
}

// Exception Class
class Exception : public std::exception {
 public:
  // Constructor
  /*!
   * Create a new exception
   */
  Exception(ExceptionType type, std::string errorMsg)
      : _type(type),
        _errorMsg(std::move(errorMsg)) {
  }

  // Destructor
  virtual ~Exception() noexcept {
  }
  virtual const char * what() const noexcept {

    _whatStr = ExceptionTypeToString(_type);

    _whatStr += ":" + _errorMsg;
    return _whatStr.c_str();
  }

 private:
  // Exception type
  ExceptionType _type;
  // Exception detailed information
  std::string _errorMsg;
  // Hold the what result
  mutable std::string _whatStr;

};

} /* namespace minifi */
} /* namespace nifi */
} /* namespace apache */
} /* namespace org */
#endif