Provided by: libmail-message-perl_3.006-1_all 
NAME
Mail::Reporter - base-class and error reporter for Mail::Box
INHERITANCE
Mail::Reporter is extended by
Mail::Box
Mail::Box::Collection
Mail::Box::Identity
Mail::Box::Locker
Mail::Box::MH::Index
Mail::Box::MH::Labels
Mail::Box::Manager
Mail::Box::Parser
Mail::Box::Search
Mail::Box::Thread::Manager
Mail::Box::Thread::Node
Mail::Message
Mail::Message::Body
Mail::Message::Body::Delayed
Mail::Message::Convert
Mail::Message::Field
Mail::Message::Field::Attribute
Mail::Message::Head
Mail::Message::Head::FieldGroup
Mail::Message::TransferEnc
Mail::Server
Mail::Transport
SYNOPSIS
$folder->log(WARNING => 'go away');
print $folder->trace; # current level
$folder->trace('PROGRESS'); # set level
print $folder->errors;
print $folder->report('PROGRESS');
DESCRIPTION
The "Mail::Reporter" class is the base class for all classes, except Mail::Message::Field::Fast because
it would become slow... This base class is used during initiation of the objects, and for configuring
and logging error messages.
METHODS
The "Mail::Reporter" class is the base for nearly all other objects. It can store and report problems,
and contains the general constructor new().
Constructors
Mail::Reporter->new(%options)
This error container is also the base constructor for all modules, (as long as there is no need for
another base object) The constructor always accepts the following %options related to error reports.
-Option--Default
log 'WARNINGS'
trace 'WARNINGS'
log => LEVEL
Log messages which have a priority higher or equal to the specified level are stored internally and
can be retrieved later. The global default for this option can be changed with defaultTrace().
Known levels are "INTERNAL", "ERRORS", "WARNINGS", "PROGRESS", "NOTICES" "DEBUG", and "NONE". The
"PROGRESS" level relates to the reading and writing of folders. "NONE" will cause only "INTERNAL"
errors to be logged. By the way: "ERROR" is an alias for "ERRORS", as "WARNING" is an alias for
"WARNINGS", and "NOTICE" for "NOTICES".
trace => LEVEL
Trace messages which have a level higher or equal to the specified level are directly printed using
warn. The global default for this option can be changed with defaultTrace().
Error handling
$obj->AUTOLOAD()
By default, produce a nice warning if the sub-classes cannot resolve a method.
$obj->addReport($object)
Add the report from other $object to the report of this object. This is useful when complex actions
use temporary objects which are not returned to the main application but where the main application
would like to know about any problems.
$obj->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
Mail::Reporter->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
Reports the default log and trace level which is used for object as list of two elements. When not
explicitly set, both are set to "WARNINGS".
This method has three different uses. When one argument is specified, that $level is set for both
loglevel as tracelevel.
With two arguments, the second determines which configuration you like. If the second argument is a
CODE reference, you install a $callback. The loglevel will be set to NONE, and all warnings produced
in your program will get passed to the $callback function. That function will get the problem level,
the object or class which reports the problem, and the problem text passed as arguments.
In any case two values are returned: the first is the log level, the second represents the trace
level. Both are special variables: in numeric context they deliver a value (the internally used
value), and in string context the string name. Be warned that the string is always in singular form!
example: setting loglevels
my ($loglevel, $tracelevel) = Mail::Reporter->defaultTrace;
Mail::Reporter->defaultTrace('NOTICES');
my ($l, $t) = Mail::Reporter->defaultTrace('WARNINGS', 'DEBUG');
print $l; # prints "WARNING" (no S!)
print $l+0; # prints "4"
print "Auch" if $l >= $self->logPriority('ERROR');
Mail::Reporter->defaultTrace('NONE'); # silence all reports
$folder->defaultTrace('DEBUG'); # Still set as global default!
$folder->trace('DEBUG'); # local default
example: installing a callback
Mail::Reporter->defaultTrace
$obj->errors()
Equivalent to
$folder->report('ERRORS')
$obj->log( [$level, [$strings]] )
Mail::Reporter->log( [$level, [$strings]] )
As instance method, this function has three different purposes. Without any argument, it returns one
scalar containing the number which is internally used to represent the current log level, and the
textual representation of the string at the same time. See Scalar::Util method "dualvar" for an
explanation.
With one argument, a new level of logging detail is set (specify a number of one of the predefined
strings). With more arguments, it is a report which may need to be logged or traced.
As class method, only a message can be passed. The global configuration value set with
defaultTrace() is used to decide whether the message is shown or ignored.
Each log-entry has a $level and a text string which will be constructed by joining the $strings. If
there is no newline, it will be added.
example:
print $message->log; # may print "NOTICE"
print $message->log +0; # may print "3"
$message->log('ERRORS'); # sets a new level, returns the numeric value
$message->log(WARNING => "This message is too large.");
$folder ->log(NOTICE => "Cannot read from file $filename.");
$manager->log(DEBUG => "Hi there!", reverse sort @l);
Mail::Message->log(ERROR => 'Unknown');
$obj->logPriority($level)
Mail::Reporter->logPriority($level)
One error level (log or trace) has more than one representation: a numeric value and one or more
strings. For instance, 4, 'WARNING', and 'WARNINGS' are all the same. You can specify any of these,
and in return you get a dualvar (see Scalar::Util method "dualvar") back, which contains the number
and the singular form.
The higher the number, the more important the message. Only messages about "INTERNAL" problems are
more important than "NONE".
example:
my $r = Mail::Reporter->logPriority('WARNINGS');
my $r = Mail::Reporter->logPriority('WARNING'); # same
my $r = Mail::Reporter->logPriority(4); # same, deprecated
print $r; # prints 'WARNING' (no S!)
print $r + 0; # prints 4
if($r < Mail::Reporter->logPriority('ERROR')) {..} # true
$obj->logSettings()
Returns a list of "(key =" value)> pairs which can be used to initiate a new object with the same
log-settings as this one.
example:
$head->new($folder->logSettings);
$obj->notImplemented()
A special case of log(), which logs a "INTERNAL"-error and then croaks. This is used by extension
writers.
$obj->report( [$level] )
Get logged reports, as list of strings. If a $level is specified, the log for that level is
returned.
In case no $level is specified, you get all messages each as reference to a tuple with level and
message.
example:
my @warns = $message->report('WARNINGS');
# previous indirectly callable with
my @warns = $msg->warnings;
print $folder->report('ERRORS');
if($folder->report('DEBUG')) {...}
my @reports = $folder->report;
foreach (@reports) {
my ($level, $text) = @$_;
print "$level report: $text";
}
$obj->reportAll( [$level] )
Report all messages which were produced by this object and all the objects which are maintained by
this object. This will return a list of triplets, each containing a reference to the object which
caught the report, the level of the report, and the message.
example:
my $folder = Mail::Box::Manager->new->open(folder => 'inbox');
my @reports = $folder->reportAll;
foreach (@reports) {
my ($object, $level, $text) = @$_;
if($object->isa('Mail::Box')) {
print "Folder $object: $level: $message";
} elsif($object->isa('Mail::Message') {
print "Message ".$object->seqnr.": $level: $message";
}
}
$obj->trace( [$level] )
Change the trace $level of the object. When no arguments are specified, the current level is returned
only. It will be returned in one scalar which contains both the number which is internally used to
represent the level, and the string which represents it. See logPriority().
$obj->warnings()
Equivalent to
$folder->report('WARNINGS')
Cleanup
$obj->DESTROY()
Cleanup the object.
DIAGNOSTICS
Error: Package $package does not implement $method.
Fatal error: the specific package (or one of its superclasses) does not implement this method where
it should. This message means that some other related classes do implement this method however the
class at hand does not. Probably you should investigate this and probably inform the author of the
package.
SEE ALSO
This module is part of Mail-Message distribution version 3.006, built on January 24, 2018. Website:
http://perl.overmeer.net/CPAN/
LICENSE
Copyrights 2001-2018 by [Mark Overmeer]. For other contributors see ChangeLog.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl
itself. See http://dev.perl.org/licenses/