/*
   Copyright (C) 2003-2006 MySQL AB, 2009 Sun Microsystems, Inc.
    All rights reserved. Use is subject to license terms.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef NDB_ERROR_HPP
#define NDB_ERROR_HPP

#include "ndberror.h"

/**
 * @struct NdbError
 * @brief Contains error information
 *
 * A NdbError consists of five parts:
 * -# Error status         : Application impact
 * -# Error classification : Logical error group
 * -# Error code           : Internal error code
 * -# Error message        : Context independent description of error 
 * -# Error details        : Context dependent information 
 *                           (not always available)
 *
 * <em>Error status</em> is usually used for programming against errors.
 * If more detailed error control is needed, it is possible to 
 * use the <em>error classification</em>.
 *
 * It is not recommended to write application programs dependent on
 * specific <em>error codes</em>.
 *
 * The <em>error messages</em> and <em>error details</em> may
 * change without notice.
 * 
 * For example of use, see @ref ndbapi_retries.cpp.
 */
struct NdbError {
  /**
   * Status categorizes error codes into status values reflecting
   * what the application should do when encountering errors
   */
  enum Status {
    /**
     * The error code indicate success<br>
     * (Includes classification: NdbError::NoError)
     */
    Success = ndberror_st_success,

    /**
     * The error code indicates a temporary error.
     * The application should typically retry.<br>
     * (Includes classifications: NdbError::InsufficientSpace, 
     *  NdbError::TemporaryResourceError, NdbError::NodeRecoveryError,
     *  NdbError::OverloadError, NdbError::NodeShutdown 
     *  and NdbError::TimeoutExpired.)
     */
    TemporaryError = ndberror_st_temporary,
    
    /**
     * The error code indicates a permanent error.<br>
     * (Includes classificatons: NdbError::PermanentError, 
     *  NdbError::ApplicationError, NdbError::NoDataFound,
     *  NdbError::ConstraintViolation, NdbError::SchemaError,
     *  NdbError::UserDefinedError, NdbError::InternalError, and, 
     *  NdbError::FunctionNotImplemented.)
     */
    PermanentError = ndberror_st_permanent,
  
    /**
     * The result/status is unknown.<br>
     * (Includes classifications: NdbError::UnknownResultError, and
     *  NdbError::UnknownErrorCode.)
     */
    UnknownResult = ndberror_st_unknown
  };
  
  /**
   * Type of error
   */
  enum Classification {
    /**
     * Success.  No error occurred.
     */
    NoError = ndberror_cl_none,

    /**
     * Error in application program.
     */
    ApplicationError = ndberror_cl_application,

    /**
     * Read operation failed due to missing record.
     */
    NoDataFound = ndberror_cl_no_data_found,

    /**
     * E.g. inserting a tuple with a primary key already existing 
     * in the table.
     */
    ConstraintViolation = ndberror_cl_constraint_violation,

    /**
     * Error in creating table or usage of table.
     */
    SchemaError = ndberror_cl_schema_error,

    /**
     * Error occurred in interpreted program.
     */
    UserDefinedError = ndberror_cl_user_defined,
    
    /**
     * E.g. insufficient memory for data or indexes.
     */
    InsufficientSpace = ndberror_cl_insufficient_space,

    /**
     * E.g. too many active transactions.
     */
    TemporaryResourceError = ndberror_cl_temporary_resource,

    /**
     * Temporary failures which are probably inflicted by a node
     * recovery in progress.  Examples: information sent between
     * application and NDB lost, distribution change.
     */
    NodeRecoveryError = ndberror_cl_node_recovery,

    /**
     * E.g. out of log file space.
     */
    OverloadError = ndberror_cl_overload,

    /**
     * Timeouts, often inflicted by deadlocks in NDB.
     */
    TimeoutExpired = ndberror_cl_timeout_expired,
    
    /**
     * Is is unknown whether the transaction was committed or not.
     */
    UnknownResultError = ndberror_cl_unknown_result,
    
    /**
     * A serious error in NDB has occurred.
     */
    InternalError = ndberror_cl_internal_error,

    /**
     * A function used is not yet implemented.
     */
    FunctionNotImplemented = ndberror_cl_function_not_implemented,

    /**
     * Error handler could not determine correct error code.
     */
    UnknownErrorCode = ndberror_cl_unknown_error_code,

    /**
     * Node shutdown
     */
    NodeShutdown = ndberror_cl_node_shutdown,

    /**
     * Schema object already exists
     */
    SchemaObjectExists = ndberror_cl_schema_object_already_exists,

    /**
     * Request sent to non master
     */
    InternalTemporary = ndberror_cl_internal_temporary
  };
  
  /**
   * Error status.  
   */
  Status status;

  /**
   * Error type
   */
  Classification classification;
  
  /**
   * Error code
   */
  int code;

  /**
   * Mysql error code
   */
  int mysql_code;

  /**
   * Error message
   */
  const char * message;

#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
  /**
   * The detailed description.  This is extra information regarding the 
   * error which is not included in the error message.
   *
   * @note Is NULL when no details specified
   */
  char * details;
#endif

#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  NdbError(){
    status = UnknownResult;
    classification = NoError;
    code = 0;
    mysql_code = 0;
    message = 0;
    details = 0;
  }
  NdbError(const ndberror_struct & ndberror){
    status = (NdbError::Status) ndberror.status;
    classification = (NdbError::Classification) ndberror.classification;
    code = ndberror.code;
    mysql_code = ndberror.mysql_code;
    message = ndberror.message;
    details = ndberror.details;
  }
  operator ndberror_struct() const {
    ndberror_struct ndberror;
    ndberror.status = (ndberror_status_enum) status;
    ndberror.classification = (ndberror_classification_enum) classification;
    ndberror.code = code;
    ndberror.mysql_code = mysql_code;
    ndberror.message = message;
    ndberror.details = details;
    return ndberror;
  }
#endif
};

class NdbOut& operator <<(class NdbOut&, const NdbError &);
class NdbOut& operator <<(class NdbOut&, const NdbError::Status&);
class NdbOut& operator <<(class NdbOut&, const NdbError::Classification&);
#endif
