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.\"
.IX Title "Zoidberg::DispatchTable 3"
.TH Zoidberg::DispatchTable 3 "2008-01-12" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Zoidberg::DispatchTable \- Class to tie dispatch tables
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&        use Zoidberg::DispatchTable;
.Ve
.PP
.Vb 3
\&        my $table = Zoidberg::DispatchTable->new(
\&                $self, { cd => '->Commands->cd' }
\&        );
.Ve
.PP
.Vb 3
\&        # The same as $self->parent->{objects}{Commands}->cd('..') if
\&        # a module can('parent'), else the same as $self->Commands->cd('..')
\&        $$table{cd}->('..');
.Ve
.PP
.Vb 1
\&        $$table{ls} = q{ls('-al')}
.Ve
.PP
.Vb 2
\&        # The same as $self->ls('-al', '/data')
\&        $$table{ls}->('/data');
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides a tie interface for converting config strings
to \s-1CODE\s0 references. It takes an object references (\f(CW$self\fR) 
as starting point for resolving subroutines.
If the object has a method \f(CW\*(C`parent()\*(C'\fR the refrence returned by this 
method is used as the root for resolving subroutines, else the object
itself is used as root.
The root is expected to contain a hash \f(CW\*(C`{objects}\*(C'\fR (possibly of the 
class Zoidberg::PluginHash) with references to \*(L"child\*(R" objects.
.PP
Strings are converted to \s-1CODE\s0 references at first use to save time
at initialisation.
.PP
The following strings are supported:
.PP
.Vb 7
\&  String              Interpretation
\&  ----------          -----------------
\&  sub                 Sub of the reference object
\&  ->sub               Sub of the root object
\&  ->sub(qw/f00 b4r/)  Sub of the root object with arguments
\&  ->object->sub       Sub of a child object of the root
\&  ->sub()->..         Sub of the root object
.Ve
.PP
You can store either config strings or \s-1CODE\s0 references in the table.
.PP
The tables is transparent to \s-1CODE\s0 references, they are used as given.
( An earlier version of this module did currying .. this behaviour is altered. )
.PP
If you store an \s-1ARRAY\s0 ref it is expected to be of the form \f(CW\*(C`[$value, $tag]\*(C'\fR,
where \f(CW$tag\fR is an identifier used for handling selections of the table.
The \f(CW$value\fR can again be a string or \s-1CODE\s0 ref.
.PP
If you store a \s-1HASH\s0 ref it will be tied recursively as a DispatchTable.
.PP
Keys are kept in the order they are first added, thus \f(CW\*(C`keys(%table)\*(C'\fR will always
return the same order. This is to keep zoid's plugins in the order they are added.
Also for each key a stack is used. Deleting a key only pops it's stack.
.PP
\&\fI This modules doesn't check for security issues, it just runs arbitrary code. \fR
.SH "EXPORT"
.IX Header "EXPORT"
This module can export the methods \f(CW\*(C`wipe\*(C'\fR, \f(CW\*(C`stack\*(C'\fR and \f(CW\*(C`tags\*(C'\fR.
.IP "add" 4
.IX Item "add"
.PD 0
.IP "pop" 4
.IX Item "pop"
.ie n .IP """wipe(\e%table, $tag, @keys)""" 4
.el .IP "\f(CWwipe(\e%table, $tag, @keys)\fR" 4
.IX Item "wipe(%table, $tag, @keys)"
.PD
Wipes entries with tag \f(CW$tag\fR from given set of kaeys or from the whole
table.
.ie n .IP """stack(\e%table, $key, $tags)""" 4
.el .IP "\f(CWstack(\e%table, $key, $tags)\fR" 4
.IX Item "stack(%table, $key, $tags)"
Returns the whole stack for an given key, useful to loop trough stacks.
\&\f(CW$tags\fR is a boolean, when true all items are returned as a sub array of \s-1CODE\s0 ref
with tag.
.ie n .IP """tag(\e%table, $key)""" 4
.el .IP "\f(CWtag(\e%table, $key)\fR" 4
.IX Item "tag(%table, $key)"
Returns the tag for the given key.
.ie n .IP """tags(\e%table, $key)""" 4
.el .IP "\f(CWtags(\e%table, $key)\fR" 4
.IX Item "tags(%table, $key)"
Returns an array of all tags for given key.
.SH "AUTHOR"
.IX Header "AUTHOR"
Jaap Karssenberg || Pardus [Larus] <pardus@cpan.org>
.PP
Copyright (c) 2003 Jaap G Karssenberg. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Zoidberg