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Mail::Message::Head::FUserGContributed Perl Mail::Message::Head::FieldGroup(3)

       Mail::Message::Head::FieldGroup - a sub set of fields in	a header

	  is a Mail::Reporter

	Mail::Message::Head::FieldGroup	is extended by

       Never instantiated directly.

       Some fields have	a combined meaning: a set of fields which represent
       one intermediate	step during the	transport of the message (a resent
       group, implemented in Mail::Message::Head::ResentGroup),	fields added
       by mailing list software	(implemented in
       Mail::Message::Head::ListGroup),	or fields added	by Spam	detection
       related software	(implemented by	Mail::Message::Head::SpamGroup).  Each
       set of fields can be extracted or added as group	with objects which are
       based on	the implementation in this class.

       Extends "DESCRIPTION" in	Mail::Reporter.

       Extends "METHODS" in Mail::Reporter.

       Extends "Constructors" in Mail::Reporter.

	   Make	a copy of this object.	The collected fieldnames are copied
	   and the list	type information.  No deep copy	is made	for the
	   header: this	is only	copied as reference.

	   Create a group of fields based on the specified $message or message
	   $head.  This	may return one or more of the objects, which depends
	   on the type of group.  Mailing list fields are all stored in	one
	   object, where resent	and spam groups	can appear more	than once.

	   Returns a list of strings containing	all possible return values for

       Mail::Message::Head::FieldGroup->new($fields, %options)
	   Construct an	object which maintains one set of header $fields.  The
	   $fields may be specified as "Mail::Message::Field" objects or as
	   key-value pairs.  The %options and $fields (as key-value pair) can
	   be mixed: they are distinguished by their name, where the fields
	   always start	with a capital.	 The field objects must	aways lead the

	    -Option  --Defined in     --Default
	     head			undef
	     log       Mail::Reporter	'WARNINGS'
	     software			undef
	     trace     Mail::Reporter	'WARNINGS'
	     type			undef
	     version			undef

	   head	=> HEAD
	     The header	HEAD object is used to store the grouped fields	in.
	     If	no header is specified,	a Mail::Message::Head::Partial is
	     created for you.  If you wish to scan the existing	fields in a
	     header, then use the from() method.

	   log => LEVEL
	   software => STRING
	     Name of the software which	produced the fields.

	   trace => LEVEL
	   type	=> STRING
	     Group name	for the	fields.	 Often the same, or close to the same
	     STRING, as	the "software" option contains.

	   version => STRING
	     Version number for	the software which produced the	fields.

   The header
       $obj->add( <$field, $value> | $object )
	   Add a field to the header, using the	field group.  When the field
	   group is already attached to	a real message header, it will appear
	   in that one as well as being	registered in this set.	 If no header
	   is defined, the field only appears internally.

	   example: adding a field to a	detached list group

	    my $this = Mail::Message::Head::ListGroup->new(...);
	    $this->add('List-Id' => 'mailbox');

	   example: adding a field to an attached list group

	    my $lg = Mail::Message::Head::ListGroup->from($msg);
	    $lg->add('List-Id' => 'mailbox');

       $obj->addFields(	[$fieldnames] )
	   Add some $fieldnames	to the set.

	   Add a group of fields to a message $head.  The fields will be
	   cloned(!)  into the header, so that the field group object can be
	   used	again.

	   example: attaching a	list group to a	message

	    my $lg = Mail::Message::Head::ListGroup->new(...);
	    $msg->head->addListGroup($lg);   # same

	    $msg->head->addSpamGroup($sg);   # also implemented	with attach

	   Remove all the header lines which are combined in this fields
	   group, from the header.

	   Return the names of the fields which	are used in this group.

	   Return the fields which are defined for this	group.

	   Returns the header object, which includes these fields.

   Access to the header
	   Returns the name of the software as is defined in the headers.  The
	   may be slightly different from the return value of type(), but
	   usually not too different.

	   Returns an abstract name for	the field group; which software	is
	   controlling it.  "undef" is returned	in case	the type is not	known.
	   Valid names are group type dependent: see the applicable manual
	   pages.  A list of all types can be retrieved	with

	   Returns the version number of the software used to produce the
	   fields.  Some kinds of software do leave such a trace, other	cases
	   will	return "undef"

       $obj->collectFields( [$name] )
	   Scan	the header for fields which are	usually	contained in field
	   group with the specified $name.  For	mailinglist groups, you	can
	   not specify a $name:	only one set of	headers	will be	found (all
	   headers are considered to be	produced by exactly one	package	of
	   mailinglist software).

	   This	method is automatically	called when a field group is
	   constructed via from() on an	existing header	or message.

	   Returned are	the names of the list header fields found, in scalar
	   context the amount of fields.  An empty list/zero indicates that
	   there was no	group to be found.

	   Please warn the author of MailBox if	you see	that to	few or too
	   many	fields are included.

       $obj->detected($type, $software,	$version)
	   Sets	the values for the field group type, software, and version,
	   prossibly to	"undef".

   Error handling
       Extends "Error handling"	in Mail::Reporter.

	   Inherited, see "Error handling" in Mail::Reporter

	   Inherited, see "Error handling" in Mail::Reporter

       $obj->defaultTrace( [$level]|[$loglevel,	$tracelevel]|[$level,
       $callback] )
       Mail::Message::Head::FieldGroup->defaultTrace( [$level]|[$loglevel,
       $tracelevel]|[$level, $callback]	)
	   Inherited, see "Error handling" in Mail::Reporter

	   Produce information about the detected/created field	group, which
	   may be helpful during debugging.  A nicely formatted	string is

	   Inherited, see "Error handling" in Mail::Reporter

       $obj->log( [$level, [$strings]] )
       Mail::Message::Head::FieldGroup->log( [$level, [$strings]] )
	   Inherited, see "Error handling" in Mail::Reporter

	   Inherited, see "Error handling" in Mail::Reporter

	   Inherited, see "Error handling" in Mail::Reporter

	   Inherited, see "Error handling" in Mail::Reporter

       $obj->print( [$fh] )
	   Print the group to the specified $fh	or GLOB.  This is probably
	   only	useful for debugging purposed.	The output defaults to the
	   selected file handle.

       $obj->report( [$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

	   Inherited, see "Error handling" in Mail::Reporter

       Extends "Cleanup" in Mail::Reporter.

	   Inherited, see "Cleanup" in Mail::Reporter

       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.

       This module is part of Mail-Message distribution	version	3.009, built
       on February 07, 2020. Website:

       Copyrights 2001-2020 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

perl v5.32.0			  2020-02-07Mail::Message::Head::FieldGroup(3)


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