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#============================================================= -*-perl-*- |
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# XML::Schema::Scheduler.pm |
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# DESCRIPTION |
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# Module implementing an object class for scheduling actions around |
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# an XML Schema. |
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# AUTHOR |
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# Andy Wardley |
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# |
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# COPYRIGHT |
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# Copyright (C) 2001 Canon Research Centre Europe Ltd. |
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# All Rights Reserved. |
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# |
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# This module is free software; you can redistribute it and/or |
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# modify it under the same terms as Perl itself. |
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# |
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# REVISION |
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# $Id: Scheduler.pm,v 1.1.1.1 2001/08/29 14:30:17 abw Exp $ |
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# |
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#======================================================================== |
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package XML::Schema::Scheduler; |
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use strict; |
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use base qw( XML::Schema::Base ); |
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use vars qw( $VERSION $DEBUG $ERROR @SCHEDULES ); |
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$VERSION = sprintf("%d.%02d", q$Revision: 1.1.1.1 $ =~ /(\d+)\.(\d+)/); |
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$DEBUG = 0 unless defined $DEBUG; |
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$ERROR = ''; |
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# default schedule lists (can be overridden in a subclass) |
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@SCHEDULES = qw( before after ); |
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#use constant TAIL => 0; |
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#use constant HEAD => 1; |
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#------------------------------------------------------------------------ |
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# init() |
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#------------------------------------------------------------------------ |
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*init_scheduler = \&init; |
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sub init { |
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my ($self, $config) = @_; |
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my ($s, $value, $schedule); |
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my $class = ref $self; |
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my ($schedules) = @{ $self->_baseargs( { first => 1 }, |
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qw( @SCHEDULES ) ) }; |
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local $" = ', '; |
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$self->DEBUG("Schedule lists for $class: [ @$schedules ]\n") |
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if $DEBUG; |
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foreach $s (@$schedules) { |
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no strict 'refs'; |
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($schedule) = @{ $self->_baseargs("\@SCHEDULE_$s") }; |
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push(@$schedule, UNIVERSAL::isa($value, 'ARRAY') ? @$value : $value) |
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if defined ($value = $config->{"schedule_$s"}); |
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$self->{"_SCHEDULE_$s"} = $schedule; |
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$self->DEBUG("_SCHEDULE_$s => [ @$schedule ]\n") |
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if $DEBUG; |
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} |
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$self->_schedule_method_factory(@$schedules); |
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2579
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return $self; |
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} |
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#------------------------------------------------------------------------ |
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# _schedule_method_factory(@methods) |
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# |
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# Iterates $m through each of the method names passed as arguments and |
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# installs two closures as the methods "schedule_$m" and "activate_$m" |
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# in the subclass package. If the "schedule_$m" method is already |
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# defined then it skips this step (assumes that "activate_$m" is also |
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# defined but doesn't actually check). These methods can then be used |
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# to schedule actions and subsequently activate them for each of the |
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# schedule lists defined for a subclass object. |
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#------------------------------------------------------------------------ |
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sub _schedule_method_factory { |
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my ($self, @methods) = @_; |
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my $class = ref $self; |
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foreach my $m (@methods) { |
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no strict 'refs'; |
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if (defined &{$class . "::schedule_$m"}) { |
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$self->DEBUG("schedule_$m method already defined in $class, skipping\n") |
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if $DEBUG; |
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} |
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else { |
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$self->DEBUG("creating schedule/action methods in $class\n") |
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if $DEBUG; |
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1663
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*{$class . "::schedule_$m"} = sub { |
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my ($self, $action, $at_head) = @_; |
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$at_head ||= 0; |
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$self->DEBUG("schedule_$m($action, $at_head)\n") |
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if $DEBUG; |
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if ($at_head) { |
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unshift(@{ $self->{"_SCHEDULE_$m"} }, $action); |
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} |
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else { |
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push(@{ $self->{"_SCHEDULE_$m"} }, $action); |
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} |
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}; |
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*{$class . "::activate_$m"} = sub { |
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my ($self, $infoset) = @_; |
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$infoset = { result => $infoset } unless UNIVERSAL::isa($infoset, 'HASH'); |
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foreach my $action (@{ $self->{"_SCHEDULE_$m"} }) { |
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# TODO: check return value for ERROR/STOP/EXPLODE/etc |
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if (ref $action eq 'CODE') { |
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$self->DEBUG("calling $action($self, $infoset)\n") |
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if $DEBUG; |
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return unless defined &$action($self, $infoset); |
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} |
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elsif (ref $action eq 'ARRAY') { |
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my ($object, $method, @args) = @$action; |
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1
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$self->DEBUG("calling $object->$method($self, $infoset, @args)\n") |
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if $DEBUG; |
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1
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return unless defined $object->$method($self, $infoset, @args); |
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} |
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else { |
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$self->DEBUG("calling $self->$action($infoset)\n") |
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if $DEBUG; |
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0
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return unless defined $self->$action($infoset); |
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} |
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} |
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return $infoset; |
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}; |
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} |
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} |
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} |
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1; |
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__END__ |