# CoinMessageHandler Class Reference

Base class for message handling. More...

`#include <CoinMessageHandler.hpp>`

Inheritance diagram for CoinMessageHandler:
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Collaboration diagram for CoinMessageHandler:
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List of all members.

## Public Member Functions
Virtual methods that the derived classes may provide
virtual int | print ()
| Print message, return 0 normally.
virtual void | checkSeverity ()
| Check message severity - if too bad then abort.
Constructors etc
| CoinMessageHandler ()
| Constructor.
| CoinMessageHandler (FILE *fp)
| Constructor to put to file pointer (won't be closed).
virtual | ~CoinMessageHandler ()
| Destructor.
| CoinMessageHandler (const CoinMessageHandler &)
| The copy constructor.
CoinMessageHandler & | operator= (const CoinMessageHandler &)
| Assignment operator.
virtual CoinMessageHandler * | clone () const
| Clone.
Get and set methods
int | detail (int messageNumber, const CoinMessages &normalMessage) const
| Get detail level of a message.
int | logLevel () const
| Get current log (detail) level.
void | setLogLevel (int value)
| Set current log (detail) level.
int | logLevel (int which) const
| Get alternative log level.
void | setLogLevel (int which, int value)
| Set alternative log level value.
void | setPrecision (unsigned int new_precision)
| Set the number of significant digits for printing floating point numbers.
int | precision ()
| Current number of significant digits for printing floating point numbers.
void | setPrefix (bool yesNo)
| Switch message prefix on or off.
bool | prefix () const
| Current setting for printing message prefix.
double | doubleValue (int position) const
| Values of double fields already processed.
int | numberDoubleFields () const
| Number of double fields already processed.
int | intValue (int position) const
| Values of integer fields already processed.
int | numberIntFields () const
| Number of integer fields already processed.
char | charValue (int position) const
| Values of char fields already processed.
int | numberCharFields () const
| Number of char fields already processed.
std::string | stringValue (int position) const
| Values of string fields already processed.
int | numberStringFields () const
| Number of string fields already processed.
CoinOneMessage | currentMessage () const
| Current message.
std::string | currentSource () const
| Source of current message.
const char * | messageBuffer () const
| Output buffer.
int | highestNumber () const
| Highest message number (indicates any errors).
FILE * | filePointer () const
| Get current file pointer.
void | setFilePointer (FILE *fp)
| Set new file pointer.
Actions to create a message
CoinMessageHandler & | message (int messageNumber, const CoinMessages &messages)
| Start a message.
CoinMessageHandler & | message (int detail=-1)
| Start or continue a message.
CoinMessageHandler & | message (int externalNumber, const char *source, const char *msg, char severity, int detail=-1)
| Print a complete message.
CoinMessageHandler & | operator<< (int intvalue)
| Process an integer parameter value.
CoinMessageHandler & | operator<< (double doublevalue)
| Process a double parameter value.
CoinMessageHandler & | operator<< (const std::string &stringvalue)
| Process a STL string parameter value.
CoinMessageHandler & | operator<< (char charvalue)
| Process a char parameter value.
CoinMessageHandler & | operator<< (const char *stringvalue)
| Process a C-style string parameter value.
CoinMessageHandler & | operator<< (CoinMessageMarker)
| Process a marker.
int | finish ()
| Finish (and print) the message.
CoinMessageHandler & | printing (bool onOff)
| Enable or disable printing of an optional portion of a message.
## Protected Attributes
Protected member data
std::vector< double > | doubleValue_
| values in message
std::vector< int > | longValue_
| values in message
std::vector< char > | charValue_
| values in message
std::vector< std::string > | stringValue_
| values in message
int | logLevel_
| Log level.
int | logLevels_ [COIN_NUM_LOG]
| Log levels.
int | prefix_
| Whether we want prefix (may get more subtle so is int).
CoinOneMessage | currentMessage_
| Current message.
int | internalNumber_
| Internal number for use with enums.
char * | format_
| Format string for message (remainder).
char | messageBuffer_ [COIN_MESSAGE_HANDLER_MAX_BUFFER_SIZE]
| Output buffer.
char * | messageOut_
| Position in output buffer.
std::string | source_
| Current source of message.
int | printStatus_
| 0 - Normal.
int | highestNumber_
| Highest message number (indicates any errors).
FILE * | fp_
| File pointer.
char | g_format_ [8]
| Current format for floating point numbers.
int | g_precision_
| Current number of significant digits for floating point numbers.
## Private Member Functions
void | gutsOfCopy (const CoinMessageHandler &rhs)
| The body of the copy constructor and the assignment operator.
char * | nextPerCent (char *start, const bool initial=false)
| Internal function to locate next format code.
int | internalPrint ()
| Internal printing function.
void | calcPrintStatus (int msglvl, int msgclass)
| Decide if this message should print.
## Friends
bool | CoinMessageHandlerUnitTest ()
| A function that tests the methods in the CoinMessageHandler class.

## Detailed Description

Base class for message handling.

The default behavior is described here: messages are printed, and (if the severity is sufficiently high) execution will be aborted. Inherit and redefine the methods print and checkSeverity to augment the behaviour.

Messages can be printed with or without a prefix; the prefix will consist of a source string, the external ID number, and a letter code, e.g., Clp6024W. A prefix makes the messages look less nimble but is very useful for "grep" etc.

### Usage

The general approach to using the COIN messaging facility is as follows:

- Define your messages. For each message, you must supply an external ID number, a log (detail) level, and a format string. Typically, you define a convenience structure for this, something that's easy to use to create an array of initialised message definitions at compile time.
- Create a CoinMessages object, sized to accommodate the number of messages you've defined. (Incremental growth will happen if necessary as messages are loaded, but it's inefficient.)
- Load the messages into the CoinMessages object. Typically this entails creating a CoinOneMessage object for each message and passing it as a parameter to CoinMessages::addMessage(). You specify the message's internal ID as the other parameter to addMessage.
- Create and use a CoinMessageHandler object to print messages.

See, for example, CoinMessage.hpp and CoinMessage.cpp for an example of the first three steps. `Format codes' below has a simple example of printing a message.

### External ID numbers and severity

CoinMessageHandler assumes the following relationship between the external ID number of a message and the severity of the message:

- <3000 are informational ('I')
- <6000 warnings ('W')
- <9000 non-fatal errors ('E')
- >=9000 aborts the program (after printing the message) ('S')

### Log (detail) levels

The default behaviour is that a message will print if its detail level is less than or equal to the handler's log level. If all you want to do is set a single log level for the handler, use setLogLevel(int).

If you want to get fancy, here's how it really works: There's an array, logLevels_, which you can manipulate with setLogLevel(int,int). Each entry logLevels_[i] specifies the log level for messages of class i (see CoinMessages::class_). If logLevels_[0] is set to the magic number -1000 you get the simple behaviour described above, whatever the class of the messages. If logLevels_[0] is set to a valid log level (>= 0), then logLevels_[i] really is the log level for messages of class i.

### Format codes

CoinMessageHandler can print integers (normal, long, and long long), doubles, characters, and strings. See the descriptions of the various << operators.

When processing a standard message with a format string, the formatting codes specified in the format string will be passed to the sprintf function, along with the argument. When generating a message with no format string, each << operator uses a simple format code appropriate for its argument. Consult the documentation for the standard printf facility for further information on format codes.

The special format code `%?' provides a hook to enable or disable printing. For each `%?' code, there must be a corresponding call to printing(bool). This provides a way to define optional parts in messages, delineated by the code `%?' in the format string. Printing can be suppressed for these optional parts, but any operands must still be supplied. For example, given the message string

        "A message with%? an optional integer %d and%? a double %g."

installed in CoinMessages `exampleMsgs` with index 5, and `CoinMessageHandler` `hdl`, the code

        hdl.message(5,exampleMsgs) ;
        hdl.printing(true) << 42 ;
        hdl.printing(true) << 53.5 << CoinMessageEol ;

will print

        A message with an optional integer 42 and a double 53.5.

while

        hdl.message(5,exampleMsgs) ;
        hdl.printing(false) << 42 ;
        hdl.printing(true) << 53.5 << CoinMessageEol ;

will print

        A message with a double 53.5.

For additional examples of usage, see CoinMessageHandlerUnitTest in CoinMessageHandlerTest.cpp.

Definition at line 327 of file CoinMessageHandler.hpp.

## Constructor & Destructor Documentation

CoinMessageHandler::CoinMessageHandler | ( |  | ) |

Constructor.

CoinMessageHandler::CoinMessageHandler | ( | FILE * | fp | ) |

Constructor to put to file pointer (won't be closed).

virtual CoinMessageHandler::~CoinMessageHandler | ( |  | ) | `[virtual]`

Destructor.

CoinMessageHandler::CoinMessageHandler | ( | const CoinMessageHandler & |  | ) |

The copy constructor.

## Member Function Documentation

virtual int CoinMessageHandler::print | ( |  | ) | `[virtual]`

Print message, return 0 normally.

Reimplemented in MyMessageHandler.

virtual void CoinMessageHandler::checkSeverity | ( |  | ) | `[virtual]`

Check message severity - if too bad then abort.

CoinMessageHandler& CoinMessageHandler::operator= | ( | const CoinMessageHandler & |  | ) |

Assignment operator.

Reimplemented in MyMessageHandler.

virtual CoinMessageHandler* CoinMessageHandler::clone | ( |  | ) | const`[virtual]`

Clone.

Reimplemented in MyMessageHandler.

int CoinMessageHandler::detail | ( | int | messageNumber,
|  | const CoinMessages & | normalMessage |
| ) |  |  | const`[inline]`

Get detail level of a message.

Definition at line 360 of file CoinMessageHandler.hpp.

int CoinMessageHandler::logLevel | ( |  | ) | const`[inline]`

Get current log (detail) level.

Definition at line 363 of file CoinMessageHandler.hpp.

void CoinMessageHandler::setLogLevel | ( | int | value | ) |

Set current log (detail) level.

If the log level is equal or greater than the detail level of a message, the message will be printed. A rough convention for the amount of output expected is

- 0 - none
- 1 - minimal
- 2 - normal low
- 3 - normal high
- 4 - verbose

Please assign log levels to messages accordingly. Log levels of 8 and above (8,16,32, etc.) are intended for selective debugging. The logical AND of the log level specified in the message and the current log level is used to determine if the message is printed. (In other words, you're using individual bits to determine which messages are printed.)

int CoinMessageHandler::logLevel | ( | int | which | ) | const`[inline]`

Get alternative log level.

Definition at line 384 of file CoinMessageHandler.hpp.

void CoinMessageHandler::setLogLevel | ( | int | which,
|  | int | value |
| ) |  |  |

Set alternative log level value.

Can be used to store alternative log level information within the handler.

void CoinMessageHandler::setPrecision | ( | unsigned int | new_precision | ) |

Set the number of significant digits for printing floating point numbers.

int CoinMessageHandler::precision | ( |  | ) | `[inline]`

Current number of significant digits for printing floating point numbers.

Definition at line 395 of file CoinMessageHandler.hpp.

void CoinMessageHandler::setPrefix | ( | bool | yesNo | ) |

Switch message prefix on or off.

bool CoinMessageHandler::prefix | ( |  | ) | const

Current setting for printing message prefix.

double CoinMessageHandler::doubleValue | ( | int | position | ) | const`[inline]`

Values of double fields already processed.

As the parameter for a double field is processed, the value is saved and can be retrieved using this function.

Definition at line 406 of file CoinMessageHandler.hpp.

int CoinMessageHandler::numberDoubleFields | ( |  | ) | const`[inline]`

Number of double fields already processed.

Incremented each time a field of type double is processed.

Definition at line 412 of file CoinMessageHandler.hpp.

int CoinMessageHandler::intValue | ( | int | position | ) | const`[inline]`

Values of integer fields already processed.

As the parameter for a integer field is processed, the value is saved and can be retrieved using this function.

Definition at line 419 of file CoinMessageHandler.hpp.

int CoinMessageHandler::numberIntFields | ( |  | ) | const`[inline]`

Number of integer fields already processed.

Incremented each time a field of type integer is processed.

Definition at line 425 of file CoinMessageHandler.hpp.

char CoinMessageHandler::charValue | ( | int | position | ) | const`[inline]`

Values of char fields already processed.

As the parameter for a char field is processed, the value is saved and can be retrieved using this function.

Definition at line 432 of file CoinMessageHandler.hpp.

int CoinMessageHandler::numberCharFields | ( |  | ) | const`[inline]`

Number of char fields already processed.

Incremented each time a field of type char is processed.

Definition at line 438 of file CoinMessageHandler.hpp.

std::string CoinMessageHandler::stringValue | ( | int | position | ) | const`[inline]`

Values of string fields already processed.

As the parameter for a string field is processed, the value is saved and can be retrieved using this function.

Definition at line 445 of file CoinMessageHandler.hpp.

int CoinMessageHandler::numberStringFields | ( |  | ) | const`[inline]`

Number of string fields already processed.

Incremented each time a field of type string is processed.

Definition at line 451 of file CoinMessageHandler.hpp.

CoinOneMessage CoinMessageHandler::currentMessage | ( |  | ) | const`[inline]`

Current message.

Definition at line 455 of file CoinMessageHandler.hpp.

std::string CoinMessageHandler::currentSource | ( |  | ) | const`[inline]`

Source of current message.

Definition at line 458 of file CoinMessageHandler.hpp.

const char* CoinMessageHandler::messageBuffer | ( |  | ) | const`[inline]`

Output buffer.

Definition at line 461 of file CoinMessageHandler.hpp.

int CoinMessageHandler::highestNumber | ( |  | ) | const`[inline]`

Highest message number (indicates any errors).

Definition at line 464 of file CoinMessageHandler.hpp.

FILE* CoinMessageHandler::filePointer | ( |  | ) | const`[inline]`

Get current file pointer.

Definition at line 467 of file CoinMessageHandler.hpp.

void CoinMessageHandler::setFilePointer | ( | FILE * | fp | ) | `[inline]`

Set new file pointer.

Definition at line 470 of file CoinMessageHandler.hpp.

CoinMessageHandler& CoinMessageHandler::message | ( | int | messageNumber,
|  | const CoinMessages & | messages |
| ) |  |  |

Start a message.

Look up the specified message. A prefix will be generated if enabled. The message will be printed if the current log level is equal or greater than the log level of the message.

CoinMessageHandler& CoinMessageHandler::message | ( | int | detail = `-1` | ) |

Start or continue a message.

With detail = -1 (default), does nothing except return a reference to the handler. (I.e., msghandler.message() << "foo" is precisely equivalent to msghandler << "foo".) If `msgDetail` is >= 0, is will be used as the detail level to determine whether the message should print (assuming class 0).

This can be used with any of the << operators. One use is to start a message which will be constructed entirely from scratch. Another use is continuation of a message after code that interrupts the usual sequence of << operators.

CoinMessageHandler& CoinMessageHandler::message | ( | int | externalNumber,
|  | const char * | source,
|  | const char * | msg,
|  | char | severity,
|  | int | detail = `-1` |
| ) |  |  |

Print a complete message.

Generate a standard prefix and append `msg` `as is'. This is intended as a transition mechanism. The standard prefix is generated (if enabled), and `msg` is appended. The message must be ended with a CoinMessageEol marker. Attempts to add content with << will have no effect.

The default value of `detail` will not change printing status. If `detail` is >= 0, it will be used as the detail level to determine whether the message should print (assuming class 0).

CoinMessageHandler& CoinMessageHandler::operator<< | ( | int | intvalue | ) |

Process an integer parameter value.

The default format code is `d'.

CoinMessageHandler& CoinMessageHandler::operator<< | ( | double | doublevalue | ) |

Process a double parameter value.

The default format code is `d'.

CoinMessageHandler& CoinMessageHandler::operator<< | ( | const std::string & | stringvalue | ) |

Process a STL string parameter value.

The default format code is `g'.

CoinMessageHandler& CoinMessageHandler::operator<< | ( | char | charvalue | ) |

Process a char parameter value.

The default format code is `s'.

CoinMessageHandler& CoinMessageHandler::operator<< | ( | const char * | stringvalue | ) |

Process a C-style string parameter value.

The default format code is `c'.

CoinMessageHandler& CoinMessageHandler::operator<< | ( | CoinMessageMarker |  | ) |

Process a marker.

The default format code is `s'.

int CoinMessageHandler::finish | ( |  | ) |

Finish (and print) the message.

Equivalent to using the CoinMessageEol marker.

CoinMessageHandler& CoinMessageHandler::printing | ( | bool | onOff | ) |

Enable or disable printing of an optional portion of a message.

Optional portions of a message are delimited by `%?' markers, and printing processes one %? marker. If `onOff` is true, the subsequent portion of the message (to the next %? marker or the end of the format string) will be printed. If `onOff` is false, printing is suppressed. Parameters must still be supplied, whether printing is suppressed or not. See the class documentation for an example.

void CoinMessageHandler::gutsOfCopy | ( | const CoinMessageHandler & | rhs | ) | `[private]`

The body of the copy constructor and the assignment operator.

char* CoinMessageHandler::nextPerCent | ( | char * | start,
|  | const bool | initial = `false` |
| ) |  |  | `[private]`

Internal function to locate next format code.

Intended for internal use. Side effects modify the format string.

int CoinMessageHandler::internalPrint | ( |  | ) | `[private]`

Internal printing function.

Makes it easier to split up print into clean, print and check severity

void CoinMessageHandler::calcPrintStatus | ( | int | msglvl,
|  | int | msgclass |
| ) |  |  | `[private]`

Decide if this message should print.

## Friends And Related Function Documentation

bool CoinMessageHandlerUnitTest | ( |  | ) | `[friend]`

A function that tests the methods in the CoinMessageHandler class.

The only reason for it not to be a member method is that this way it doesn't have to be compiled into the library. And that's a gain, because the library should be compiled with optimization on, but this method should be compiled with debugging.

## Member Data Documentation

std::vector<double> CoinMessageHandler::doubleValue_`[protected]`

values in message

Definition at line 593 of file CoinMessageHandler.hpp.

std::vector<int> CoinMessageHandler::longValue_`[protected]`

values in message

Definition at line 594 of file CoinMessageHandler.hpp.

std::vector<char> CoinMessageHandler::charValue_`[protected]`

values in message

Definition at line 595 of file CoinMessageHandler.hpp.

std::vector<std::string> CoinMessageHandler::stringValue_`[protected]`

values in message

Definition at line 596 of file CoinMessageHandler.hpp.

int CoinMessageHandler::logLevel_`[protected]`

Log level.

Definition at line 598 of file CoinMessageHandler.hpp.

int CoinMessageHandler::logLevels_[COIN_NUM_LOG]`[protected]`

Log levels.

Definition at line 600 of file CoinMessageHandler.hpp.

int CoinMessageHandler::prefix_`[protected]`

Whether we want prefix (may get more subtle so is int).

Definition at line 602 of file CoinMessageHandler.hpp.

CoinOneMessage CoinMessageHandler::currentMessage_`[protected]`

Current message.

Definition at line 604 of file CoinMessageHandler.hpp.

int CoinMessageHandler::internalNumber_`[protected]`

Internal number for use with enums.

Definition at line 606 of file CoinMessageHandler.hpp.

char* CoinMessageHandler::format_`[protected]`

Format string for message (remainder).

Definition at line 608 of file CoinMessageHandler.hpp.

char CoinMessageHandler::messageBuffer_[COIN_MESSAGE_HANDLER_MAX_BUFFER_SIZE]`[protected]`

Output buffer.

Definition at line 610 of file CoinMessageHandler.hpp.

char* CoinMessageHandler::messageOut_`[protected]`

Position in output buffer.

Definition at line 612 of file CoinMessageHandler.hpp.

std::string CoinMessageHandler::source_`[protected]`

Current source of message.

Definition at line 614 of file CoinMessageHandler.hpp.

int CoinMessageHandler::printStatus_`[protected]`

0 - Normal.

1 - Put in values, move along format, but don't print. 2 - A complete message was provided; nothing more to do but print when CoinMessageEol is processed. Any << operators are treated as noops. 3 - do nothing except look for CoinMessageEol (i.e., the message detail level was not sufficient to cause it to print).

Definition at line 623 of file CoinMessageHandler.hpp.

int CoinMessageHandler::highestNumber_`[protected]`

Highest message number (indicates any errors).

Definition at line 625 of file CoinMessageHandler.hpp.

FILE* CoinMessageHandler::fp_`[protected]`

File pointer.

Definition at line 627 of file CoinMessageHandler.hpp.

char CoinMessageHandler::g_format_[8]`[protected]`

Current format for floating point numbers.

Definition at line 629 of file CoinMessageHandler.hpp.

int CoinMessageHandler::g_precision_`[protected]`

Current number of significant digits for floating point numbers.

Definition at line 631 of file CoinMessageHandler.hpp.

The documentation for this class was generated from the following file:

- /home/coin/svn-release/Alps-1.4.8/CoinUtils/src/CoinMessageHandler.hpp