=head1 NAME

Mail::Message::Body::Nested - body of a message which contains a message

=head1 INHERITANCE

 Mail::Message::Body::Nested
   is a Mail::Message::Body
   is a Mail::Reporter

=head1 SYNOPSIS

 See Mail::Message::Body

 if($body->isNested) {
    my $nest = $body->nested;
    $nest->delete;
 }

=head1 DESCRIPTION

The body (content) of a message can be stored in various ways.  In this
manual-page you find the description of extra functionality you have
when a message contains a nested message, like C<message/rfc822>.

A nested message is different from a multipart message which contains
only one element, because a nested message has a full set of message
header fields defined by the RFC882, where a part of a multipart has
only a few.  But because we do not keep track whether all fields are
presented, a C<Mail::Message::Part> is used anyway.

=head1 OVERLOADED

overload: B<"">

=over 4

See L<Mail::Message::Body/"OVERLOADED">

=back

overload: B<'==' and '!='>

=over 4

See L<Mail::Message::Body/"OVERLOADED">

=back

overload: B<@{}>

=over 4

See L<Mail::Message::Body/"OVERLOADED">

=back

overload: B<bool>

=over 4

See L<Mail::Message::Body/"OVERLOADED">

=back

=head1 METHODS

=head2 Constructors

$obj-E<gt>B<clone>

=over 4

See L<Mail::Message::Body/"Constructors">

=back

Mail::Message::Body::Nested-E<gt>B<new>(OPTIONS)

=over 4

 Option           --Defined in     --Default
 based_on           Mail::Message::Body  undef
 charset            Mail::Message::Body  'us-ascii'
 checked            Mail::Message::Body  <false>
 data               Mail::Message::Body  undef
 description        Mail::Message::Body  undef
 disposition        Mail::Message::Body  undef
 eol                Mail::Message::Body  'NATIVE'
 file               Mail::Message::Body  undef
 log                Mail::Reporter   'WARNINGS'
 message            Mail::Message::Body  undef
 mime_type          Mail::Message::Body  'message/rfc822'
 modified           Mail::Message::Body  <false>
 nested                              undef
 trace              Mail::Reporter   'WARNINGS'
 transfer_encoding  Mail::Message::Body  'none'

. based_on => BODY

. charset => STRING

. checked => BOOLEAN

. data => ARRAY-OF-LINES | STRING

. description => STRING|FIELD

. disposition => STRING|FIELD

. eol => 'CR'|'LF'|'CRLF'|'NATIVE'

. file => FILENAME|FILEHANDLE|IOHANDLE

. log => LEVEL

. message => MESSAGE

. mime_type => STRING|FIELD|MIME

. modified => BOOLEAN

. nested => MESSAGE

=over 4

The message which is encapsulated within this body.

=back

. trace => LEVEL

. transfer_encoding => STRING|FIELD

example: 

 my $msg   = $folder->message(3);
 my $encaps= Mail::Message::Body::Nested->new(nested => $msg);

 # The body will be coerced into a message, which lacks a few
 # lines but we do not bother.
 my $intro = Mail::Message::Body->new(data => ...);
 my $body  = Mail::Message::Body::Nested->new(nested  => $intro);

=back

=head2 Constructing a body

$obj-E<gt>B<attach>(MESSAGES, OPTIONS)

=over 4

See L<Mail::Message::Body::Construct/"Constructing a body">

=back

$obj-E<gt>B<check>

=over 4

See L<Mail::Message::Body::Encode/"Constructing a body">

=back

$obj-E<gt>B<concatenate>(COMPONENTS)

=over 4

See L<Mail::Message::Body::Construct/"Constructing a body">

=back

$obj-E<gt>B<decoded>(OPTIONS)

=over 4

See L<Mail::Message::Body/"Constructing a body">

=back

$obj-E<gt>B<encode>(OPTIONS)

=over 4

See L<Mail::Message::Body::Encode/"Constructing a body">

=back

$obj-E<gt>B<encoded>

=over 4

See L<Mail::Message::Body::Encode/"Constructing a body">

=back

$obj-E<gt>B<eol>(['CR'|'LF'|'CRLF'|'NATIVE'])

=over 4

See L<Mail::Message::Body/"Constructing a body">

=back

$obj-E<gt>B<foreachLine>((CODE))

=over 4

It is NOT possible to call some code for each line of a nested
because that would damage the header of the encapsulated message

=back

$obj-E<gt>B<stripSignature>(OPTIONS)

=over 4

See L<Mail::Message::Body::Construct/"Constructing a body">

=back

$obj-E<gt>B<unify>(BODY)

=over 4

See L<Mail::Message::Body::Encode/"Constructing a body">

=back

=head2 The body

$obj-E<gt>B<isDelayed>

=over 4

See L<Mail::Message::Body/"The body">

=back

$obj-E<gt>B<isMultipart>

=over 4

See L<Mail::Message::Body/"The body">

=back

$obj-E<gt>B<isNested>

=over 4

See L<Mail::Message::Body/"The body">

=back

$obj-E<gt>B<message>([MESSAGE])

=over 4

See L<Mail::Message::Body/"The body">

=back

=head2 About the payload

$obj-E<gt>B<charset>

=over 4

See L<Mail::Message::Body/"About the payload">

=back

$obj-E<gt>B<checked>([BOOLEAN])

=over 4

See L<Mail::Message::Body/"About the payload">

=back

$obj-E<gt>B<description>([STRING|FIELD])

=over 4

See L<Mail::Message::Body/"About the payload">

=back

$obj-E<gt>B<disposition>([STRING|FIELD])

=over 4

See L<Mail::Message::Body/"About the payload">

=back

$obj-E<gt>B<dispositionFilename>([DIRECTORY])

=over 4

See L<Mail::Message::Body::Encode/"About the payload">

=back

$obj-E<gt>B<isBinary>

=over 4

See L<Mail::Message::Body::Encode/"About the payload">

=back

$obj-E<gt>B<isText>

=over 4

See L<Mail::Message::Body::Encode/"About the payload">

=back

$obj-E<gt>B<mimeType>

=over 4

See L<Mail::Message::Body/"About the payload">

=back

$obj-E<gt>B<nrLines>

=over 4

See L<Mail::Message::Body/"About the payload">

=back

$obj-E<gt>B<size>

=over 4

See L<Mail::Message::Body/"About the payload">

=back

$obj-E<gt>B<transferEncoding>([STRING|FIELD])

=over 4

See L<Mail::Message::Body/"About the payload">

=back

$obj-E<gt>B<type>([STRING|FIELD])

=over 4

See L<Mail::Message::Body/"About the payload">

=back

=head2 Access to the payload

$obj-E<gt>B<endsOnNewline>

=over 4

See L<Mail::Message::Body/"Access to the payload">

=back

$obj-E<gt>B<file>

=over 4

See L<Mail::Message::Body/"Access to the payload">

=back

$obj-E<gt>B<forNested>(CODE)

=over 4

Execute the CODE for the nested message.  This returns a new
nested body object.  Returns C<undef> when the CODE returns C<undef>.

=back

$obj-E<gt>B<lines>

=over 4

See L<Mail::Message::Body/"Access to the payload">

=back

$obj-E<gt>B<nested>

=over 4

Returns the L<Mail::Message::Part|Mail::Message::Part> message which is enclosed within
this body.

=back

$obj-E<gt>B<print>([FILEHANDLE])

=over 4

See L<Mail::Message::Body/"Access to the payload">

=back

$obj-E<gt>B<printEscapedFrom>(FILEHANDLE)

=over 4

See L<Mail::Message::Body/"Access to the payload">

=back

$obj-E<gt>B<string>

=over 4

See L<Mail::Message::Body/"Access to the payload">

=back

$obj-E<gt>B<stripTrailingNewline>

=over 4

See L<Mail::Message::Body/"Access to the payload">

=back

$obj-E<gt>B<write>(OPTIONS)

=over 4

See L<Mail::Message::Body/"Access to the payload">

=back

=head2 Internals

$obj-E<gt>B<addTransferEncHandler>(NAME, CLASS|OBJECT)

Mail::Message::Body::Nested-E<gt>B<addTransferEncHandler>(NAME, CLASS|OBJECT)

=over 4

See L<Mail::Message::Body::Encode/"Internals">

=back

$obj-E<gt>B<contentInfoFrom>(HEAD)

=over 4

See L<Mail::Message::Body/"Internals">

=back

$obj-E<gt>B<contentInfoTo>(HEAD)

=over 4

See L<Mail::Message::Body/"Internals">

=back

$obj-E<gt>B<fileLocation>([BEGIN,END])

=over 4

See L<Mail::Message::Body/"Internals">

=back

$obj-E<gt>B<getTransferEncHandler>(TYPE)

=over 4

See L<Mail::Message::Body::Encode/"Internals">

=back

$obj-E<gt>B<isModified>

=over 4

See L<Mail::Message::Body/"Internals">

=back

$obj-E<gt>B<load>

=over 4

See L<Mail::Message::Body/"Internals">

=back

$obj-E<gt>B<modified>([BOOLEAN])

=over 4

See L<Mail::Message::Body/"Internals">

=back

$obj-E<gt>B<moveLocation>([DISTANCE])

=over 4

See L<Mail::Message::Body/"Internals">

=back

$obj-E<gt>B<read>(PARSER, HEAD, BODYTYPE [,CHARS [,LINES]])

=over 4

See L<Mail::Message::Body/"Internals">

=back

=head2 Error handling

$obj-E<gt>B<AUTOLOAD>

=over 4

See L<Mail::Message::Body/"Error handling">

=back

$obj-E<gt>B<addReport>(OBJECT)

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<defaultTrace>([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])

Mail::Message::Body::Nested-E<gt>B<defaultTrace>([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<errors>

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<log>([LEVEL [,STRINGS]])

Mail::Message::Body::Nested-E<gt>B<log>([LEVEL [,STRINGS]])

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<logPriority>(LEVEL)

Mail::Message::Body::Nested-E<gt>B<logPriority>(LEVEL)

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<logSettings>

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<notImplemented>

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<report>([LEVEL])

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<reportAll>([LEVEL])

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<trace>([LEVEL])

=over 4

See L<Mail::Reporter/"Error handling">

=back

$obj-E<gt>B<warnings>

=over 4

See L<Mail::Reporter/"Error handling">

=back

=head2 Cleanup

$obj-E<gt>B<DESTROY>

=over 4

See L<Mail::Reporter/"Cleanup">

=back

$obj-E<gt>B<inGlobalDestruction>

=over 4

See L<Mail::Reporter/"Cleanup">

=back

=head1 DETAILS

=head1 DIAGNOSTICS

Warning: No decoder defined for transfer encoding $name.

=over 4

The data (message body) is encoded in a way which is not currently understood,
therefore no decoding (or recoding) can take place.

=back

Warning: No encoder defined for transfer encoding $name.

=over 4

The data (message body) has been decoded, but the required encoding is
unknown.  The decoded data is returned.

=back

Error: Package $package does not implement $method.

=over 4

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.

=back

Error: You cannot use foreachLine on a nested

=over 4

L<foreachLine()|Mail::Message::Body::Nested/"METHODS"> should be used on decoded message bodies only, because
it would modify the header of the encapsulated message. which is
clearly not acceptible.

=back

=head1 SEE ALSO

This module is part of Mail-Box distribution version 2.073,
built on July 19, 2007. Website: F<http://perl.overmeer.net/mailbox/>

=head1 LICENSE

Copyrights 2001-2007 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 F<http://www.perl.com/perl/misc/Artistic.html>

