Provided by: libmail-box-perl_3.012-1_all 
NAME
Mail::Message::Head::Subset - subset of header information of a message
INHERITANCE
Mail::Message::Head::Subset realizes a Mail::Message::Head::Complete
Mail::Message::Head::Subset
is a Mail::Message::Head
is a Mail::Reporter
SYNOPSIS
my $subset = Mail::Message::Head::Subset->new(...)
$subset->isa('Mail::Message::Head') # true
$subset->guessBodySize # integer or undef
$subset->isDelayed # true
DESCRIPTION
Some types of folders contain an index file which lists a few lines of information per messages.
Especially when it is costly to read header lines, the index speeds-up access considerably. For
instance, the subjects of all messages are often wanted, but waiting for a thousand messages of the
folder to be read may imply a thousand network reads (IMAP) or file openings (MH)
When you access header fields which are not in the header subset, the whole header has to be parsed
(which may consume considerable time, depending on the type of folder).
Extends "DESCRIPTION" in Mail::Message::Head.
OVERLOADED
Extends "OVERLOADED" in Mail::Message::Head.
overload: "" stringifaction
Inherited, see "OVERLOADED" in Mail::Message::Head
overload: bool true/false
Inherited, see "OVERLOADED" in Mail::Message::Head
METHODS
Extends "METHODS" in Mail::Message::Head.
Constructors
Extends "Constructors" in Mail::Message::Head.
$class->build( [PAIR|$field]-LIST )
Inherited, see "Constructors" in Mail::Message::Head
$class->new(%options)
Inherited, see "Constructors" in Mail::Message::Head
Attributes
Extends "Attributes" in Mail::Message::Head.
$obj->logSettings()
Inherited, see "Attributes" in Mail::Reporter
The header
Extends "The header" in Mail::Message::Head.
$obj->isDelayed()
Inherited, see "The header" in Mail::Message::Head
$obj->isEmpty()
Inherited, see "The header" in Mail::Message::Head
$obj->isModified()
Inherited, see "The header" in Mail::Message::Head
$obj->knownNames()
Inherited, see "The header" in Mail::Message::Head
$obj->message( [$message] )
Inherited, see "The header" in Mail::Message::Head
$obj->modified( [BOOLEAN] )
Inherited, see "The header" in Mail::Message::Head
$obj->orderedFields()
Inherited, see "The header" in Mail::Message::Head
Access to the header
Extends "Access to the header" in Mail::Message::Head.
$obj->count($name)
Count the number of fields with this $name. If the $name cannot be found, the full header get
loaded. In case we find any $name field, it is decided we know all of them, and loading is not
needed.
$obj->get( $name, [$index] )
Get the data which is related to the field with the $name. The case of the characters in $name does
not matter. When a $name is used which is not known yet, realization will take place. Improves
base, see "Access to the header" in Mail::Message::Head
$obj->study( $name, [$index] )
Inherited, see "Access to the header" in Mail::Message::Head
About the body
Extends "About the body" in Mail::Message::Head.
$obj->guessBodySize()
The body size is defined in the "Content-Length" field. However, this field may not be known. In
that case, a guess is made based on the known "Lines" field. When also that field is not known yet,
"undef" is returned. Improves base, see "About the body" in Mail::Message::Head
$obj->isMultipart()
Inherited, see "About the body" in Mail::Message::Head
Internals
Extends "Internals" in Mail::Message::Head.
$obj->addNoRealize($field)
Inherited, see "Internals" in Mail::Message::Head
$obj->addOrderedFields($fields)
Inherited, see "Internals" in Mail::Message::Head
$obj->fileLocation()
Inherited, see "Internals" in Mail::Message::Head
$obj->load()
Inherited, see "Internals" in Mail::Message::Head
$obj->moveLocation($distance)
Inherited, see "Internals" in Mail::Message::Head
$obj->read($parser)
Inherited, see "Internals" in Mail::Message::Head
$obj->setNoRealize($field)
Inherited, see "Internals" in Mail::Message::Head
Error handling
Extends "Error handling" in Mail::Message::Head.
$obj->AUTOLOAD()
Inherited, see "Error handling" in Mail::Reporter
$obj->addReport($object)
Inherited, see "Error handling" in Mail::Reporter
$any->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
Inherited, see "Error handling" in Mail::Reporter
$obj->errors()
Inherited, see "Error handling" in Mail::Reporter
$any->log( [$level, [$strings]] )
Inherited, see "Error handling" in Mail::Reporter
$any->logPriority($level)
Inherited, see "Error handling" in Mail::Reporter
$obj->notImplemented()
Inherited, see "Error handling" in Mail::Reporter
$obj->report( [$level] )
Inherited, see "Error handling" in Mail::Reporter
$obj->reportAll( [$level] )
Inherited, see "Error handling" in Mail::Reporter
$obj->trace( [$level] )
Inherited, see "Error handling" in Mail::Reporter
$obj->warnings()
Inherited, see "Error handling" in Mail::Reporter
Cleanup
Extends "Cleanup" in Mail::Message::Head.
$obj->DESTROY()
Inherited, see "Cleanup" in Mail::Reporter
DETAILS
Extends "DETAILS" in Mail::Message::Head.
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. Cast by notImplemented()
SEE ALSO
This module is part of Mail-Box version 3.012, built on November 27, 2025. Website:
http://perl.overmeer.net/CPAN/
LICENSE
For contributors see file ChangeLog.
This software is copyright (c) 2001-2025 by Mark Overmeer.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5
programming language system itself.
perl v5.40.1 2025-12-07 Mail::Message::Head::Subset(3pm)