#include <Exception.h>

Inheritance diagram for zypp::Exception:

Public Types
typedef exception_detail::CodeLocation	CodeLocation
typedef std::list< std::string >	History
typedef History::const_iterator	HistoryIterator
typedef History::size_type	HistorySize
Public Member Functions
	Exception ()
	Default ctor.
	Exception (const std::string &msg_r)
	Ctor taking a message.
	Exception (const std::string &msg_r, const Exception &history_r)
	Ctor taking a message and an exception to remember as history.
virtual	~Exception () throw ()
	Dtor.
const CodeLocation &	where () const
	Return CodeLocation.
void	relocate (const CodeLocation &where_r) const
	Exchange location on rethrow.
const std::string &	msg () const
	Return the message string provided to the ctor.
std::string	asString () const
	Error message provided by dumpOn as string.
std::string	asUserString () const
	Translated error message as string suitable for the user.
History list of message strings.
Maintain a simple list of individual error messages, that lead to this Exception. The Exceptions message itself is not included in the history. The History list stores the most recent message fist.
void	remember (const Exception &old_r)
	Store an other Exception as history.
void	addHistory (const std::string &msg_r)
	Add some message text to the history.
HistoryIterator	historyBegin () const
	Iterator pointing to the most recent message.
HistoryIterator	historyEnd () const
	Iterator pointing behind the last message.
bool	historyEmpty () const
	Whether the history list is empty.
HistorySize	historySize () const
	The size of the history list.
std::string	historyAsString () const
	The history as string.
std::string	asUserHistory () const
	A single (multiline) string composed of asUserString and historyAsString.
Static Public Member Functions
static std::string	strErrno (int errno_r)
	Make a string from errno_r.
static std::string	strErrno (int errno_r, const std::string &msg_r)
	Make a string from errno_r and msg_r.
static void	log (const Exception &excpt_r, const CodeLocation &where_r, const char *const prefix_r)
	Drop a logline on throw, catch or rethrow.
Protected Member Functions
virtual std::ostream &	dumpOn (std::ostream &str) const
	Overload this to print a proper error message.
Private Member Functions
virtual const char *	what () const throw ()
	Return message string.
std::ostream &	dumpError (std::ostream &str) const
	Called by `std::ostream & operator<<`.
Private Attributes
CodeLocation	_where
std::string	_msg
History	_history
Friends
std::ostream &	operator<< (std::ostream &str, const Exception &obj)
Related Functions
(Note that these are not member functions.)
std::ostream &	operator<< (std::ostream &str, const Exception &obj)

Detailed Description

Base class for Exception.

Exception offers to store a message string passed to the ctor. Derived classes may provide additional information. Overload dumpOn to provide a proper error text.

Use ZYPP_THROW macros to throw exceptions.
Use ZYPP_CAUGHT If you caught an exceptions in order to handle it.
Use ZYPP_RETHROW to rethrow a caught exception.

The use of these macros is not mandatory. but ZYPP_THROW and ZYPP_RETHROW will adjust the code location information stored in the Exception. All three macros will drop a line in the logfile.

  43   try
  44     {
  45       try
  46         {
  47           ZYPP_THROW( Exception("Something bad happened.") );
  48         }
  49       catch ( Exception & excpt )
  50         {
  51           ZYPP_RETHROW( excpt );
  52         }
  53
  54     }
  55   catch ( Exception & excpt )
  56     {
  57       ZYPP_CAUGHT( excpt );
  58     }

The above produces the following log lines:

  Main.cc(main):47 THROW:    Main.cc(main):47: Something bad happened.
  Main.cc(main):51 RETHROW:  Main.cc(main):47: Something bad happened.
  Main.cc(main):57 CAUGHT:   Main.cc(main):51: Something bad happened.

Class Exception now offers a history list of message strings. These messages should describe what lead to the exception.

The Exceptions message itself is NOT included in the history.

Rethrow, remembering an old exception:

 try
 {
   ....
 }
 catch( const Exception & olderr_r )
 {
    ZYPP_CAUGHT( olderr_r )
    HighLevelException newerr( "Something failed." );
    newerr.rember( olderr_r );
    ZYPP_THROW( newerr );
 }

Print an Exception followed by it's history if available:

 Exception error;
 ERR << error << endl << error.historyAsString();

Todo:: That's a draft to have a common way of throwing exceptions. Most probabely we'll finally use blocxx exceptions. Here, but not in the remaining code of zypp. If we can we should try to wrap the blocxx macros and typedef the classes in here.

Definition at line 143 of file Exception.h.

Member Typedef Documentation

typedef exception_detail::CodeLocation zypp::Exception::CodeLocation

Definition at line 148 of file Exception.h.

typedef std::list<std::string> zypp::Exception::History

Definition at line 149 of file Exception.h.

typedef History::const_iterator zypp::Exception::HistoryIterator

Definition at line 150 of file Exception.h.

typedef History::size_type zypp::Exception::HistorySize

Definition at line 151 of file Exception.h.

Constructor & Destructor Documentation

zypp::Exception::Exception ( )

Default ctor.

Use ZYPP_THROW macros to throw exceptions.

Definition at line 45 of file Exception.cc.

zypp::Exception::Exception ( const std::string & msg_r )

Ctor taking a message.

Use ZYPP_THROW macros to throw exceptions.

Definition at line 48 of file Exception.cc.

zypp::Exception::Exception	(	const std::string &	msg_r,
		const Exception &	history_r
	)

Ctor taking a message and an exception to remember as history.

See also:: remember Use ZYPP_THROW macros to throw exceptions.

Definition at line 52 of file Exception.cc.

zypp::Exception::~Exception ( ) throw () [virtual]

Dtor.

Definition at line 56 of file Exception.cc.

Member Function Documentation

const CodeLocation& zypp::Exception::where ( ) const [inline]

Return CodeLocation.

Definition at line 173 of file Exception.h.

void zypp::Exception::relocate ( const CodeLocation & where_r ) const [inline]

Exchange location on rethrow.

Definition at line 177 of file Exception.h.

const std::string& zypp::Exception::msg ( ) const [inline]

Return the message string provided to the ctor.

Note:: This is not necessarily the complete error message. The whole error message is provided by asString or dumpOn.

Definition at line 185 of file Exception.h.

std::string zypp::Exception::asString ( ) const

Error message provided by dumpOn as string.

Definition at line 59 of file Exception.cc.

std::string zypp::Exception::asUserString ( ) const

Translated error message as string suitable for the user.

See also:: asUserStringHistory

Definition at line 66 of file Exception.cc.

void zypp::Exception::remember ( const Exception & old_r )

Store an other Exception as history.

Definition at line 89 of file Exception.cc.

void zypp::Exception::addHistory ( const std::string & msg_r )

Add some message text to the history.

Definition at line 99 of file Exception.cc.

HistoryIterator zypp::Exception::historyBegin ( ) const [inline]

Iterator pointing to the most recent message.

Definition at line 212 of file Exception.h.

HistoryIterator zypp::Exception::historyEnd ( ) const [inline]

Iterator pointing behind the last message.

Definition at line 216 of file Exception.h.

bool zypp::Exception::historyEmpty ( ) const [inline]

Whether the history list is empty.

Definition at line 220 of file Exception.h.

HistorySize zypp::Exception::historySize ( ) const [inline]

The size of the history list.

Definition at line 224 of file Exception.h.

std::string zypp::Exception::historyAsString ( ) const

The history as string.

Empty if historyEmpty. Otherwise:

 History:
  - most recent message
  - 2nd message
 ...
  - oldest message

Definition at line 104 of file Exception.cc.

std::string zypp::Exception::asUserHistory ( ) const

A single (multiline) string composed of asUserString and historyAsString.

Definition at line 75 of file Exception.cc.

std::ostream & zypp::Exception::dumpOn ( std::ostream & str ) const [protected, virtual]

Overload this to print a proper error message.

Definition at line 114 of file Exception.cc.

std::string zypp::Exception::strErrno ( int errno_r ) [static]

Make a string from errno_r.

Definition at line 124 of file Exception.cc.

std::string zypp::Exception::strErrno	(	int	errno_r,
		const std::string &	msg_r
	)		`[static]`

Make a string from errno_r and msg_r.

Definition at line 127 of file Exception.cc.

void zypp::Exception::log	(	const Exception &	excpt_r,
		const CodeLocation &	where_r,
		const char *const	prefix_r
	)		`[static]`

Drop a logline on throw, catch or rethrow.

Used by ZYPP_THROW macros macros.

Definition at line 134 of file Exception.cc.

virtual const char* zypp::Exception::what ( ) const throw () [inline, private, virtual]

Return message string.

Definition at line 267 of file Exception.h.

std::ostream & zypp::Exception::dumpError ( std::ostream & str ) const [private]

Called by std::ostream & operator<<.

Prints CodeLocation and the error message provided by dumpOn.

Definition at line 117 of file Exception.cc.

Friends And Related Function Documentation

std::ostream& operator<<	(	std::ostream &	str,
		const Exception &	obj
	)		`[friend]`

Definition at line 120 of file Exception.cc.

std::ostream & operator<<	(	std::ostream &	str,
		const Exception &	obj
	)		`[related]`

Stream output

Definition at line 120 of file Exception.cc.

Member Data Documentation

CodeLocation zypp::Exception::_where [mutable, private]

Definition at line 262 of file Exception.h.

std::string zypp::Exception::_msg [private]

Reimplemented in zypp::media::MediaNoLoopDeviceException, zypp::media::MediaBadCAException, zypp::media::MediaTemporaryProblemException, zypp::media::MediaTimeoutException, zypp::media::MediaForbiddenException, zypp::media::MediaAria2cSetOptException, zypp::media::MediaAria2cException, zypp::media::MediaMetalinkSetOptException, zypp::media::MediaMetalinkException, zypp::media::MediaCurlSetOptException, zypp::media::MediaCurlException, and zypp::media::MediaBadUrlException.

Definition at line 263 of file Exception.h.

History zypp::Exception::_history [private]

Definition at line 264 of file Exception.h.

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

zypp/base/Exception.h
zypp/base/Exception.cc

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes