--- /dev/null
+package SQL::Translator::Schema::Trigger;
+
+# ----------------------------------------------------------------------
+# $Id: Trigger.pm,v 1.1 2003-10-03 23:56:41 kycl4rk Exp $
+# ----------------------------------------------------------------------
+# Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; version 2.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+# 02111-1307 USA
+# -------------------------------------------------------------------
+
+=pod
+
+=head1 NAME
+
+SQL::Translator::Schema::Trigger - SQL::Translator trigger object
+
+=head1 SYNOPSIS
+
+ use SQL::Translator::Schema::Trigger;
+ my $trigger = SQL::Translator::Schema::Trigger->new(
+ name => 'foo',
+ perform_action_when => 'before', # or after
+ database_event => 'insert', # or update, update_on, delete
+ fields => [], # fields if event is "update"
+ on_table => 'foo', # table name
+ action => '...', # text of trigger
+ );
+
+=head1 DESCRIPTION
+
+C<SQL::Translator::Schema::Trigger> is the trigger object.
+
+=head1 METHODS
+
+=cut
+
+use strict;
+use Class::Base;
+use SQL::Translator::Utils 'parse_list_arg';
+
+use base 'Class::Base';
+use vars qw($VERSION $TABLE_COUNT $VIEW_COUNT);
+
+$VERSION = sprintf "%d.%02d", q$Revision: 1.1 $ =~ /(\d+)\.(\d+)/;
+
+# ----------------------------------------------------------------------
+sub init {
+
+=pod
+
+=head2 new
+
+Object constructor.
+
+ my $schema = SQL::Translator::Schema::Trigger->new;
+
+=cut
+
+ my ( $self, $config ) = @_;
+
+ for my $arg (
+ qw[ name perform_action_when database_event fields on_table action ]
+ ) {
+ next unless $config->{ $arg };
+ $self->$arg( $config->{ $arg } );# or return;
+ }
+
+ return $self;
+}
+
+# ----------------------------------------------------------------------
+sub perform_action_when {
+
+=pod
+
+=head2 perform_action_when
+
+Gets or sets whether the event happens "before" or "after" the
+C<database_event>.
+
+ $trigger->perform_action_when('after');
+
+=cut
+
+ my $self = shift;
+
+ if ( my $arg = shift ) {
+ $arg = lc $arg;
+ $arg =~ s/\s+/ /g;
+ if ( $arg =~ m/^(before|after)$/i ) {
+ $self->{'perform_action_when'} = $arg;
+ }
+ else {
+ return
+ $self->error("Invalid argument '$arg' to perform_action_when");
+ }
+ }
+
+ return $self->{'perform_action_when'};
+}
+
+# ----------------------------------------------------------------------
+sub database_event {
+
+=pod
+
+=head2 database_event
+
+Gets or sets the event that triggers the trigger.
+
+ my $ok = $trigger->database_event('insert');
+
+=cut
+
+ my $self = shift;
+
+ if ( my $arg = shift ) {
+ $arg = lc $arg;
+ $arg =~ s/\s+/ /g;
+ if ( $arg =~ /^(insert|update|update_on|delete)$/ ) {
+ $self->{'database_event'} = $arg;
+ }
+ else {
+ return
+ $self->error("Invalid argument '$arg' to database_event");
+ }
+ }
+
+ return $self->{'database_event'};
+}
+
+# ----------------------------------------------------------------------
+sub fields {
+
+=pod
+
+=head2 fields
+
+Gets and set which fields to monitor for C<database_event>.
+
+ $view->fields('id');
+ $view->fields('id', 'name');
+ $view->fields( 'id, name' );
+ $view->fields( [ 'id', 'name' ] );
+ $view->fields( qw[ id name ] );
+
+ my @fields = $view->fields;
+
+=cut
+
+ my $self = shift;
+ my $fields = parse_list_arg( @_ );
+
+ if ( @$fields ) {
+ my ( %unique, @unique );
+ for my $f ( @$fields ) {
+ next if $unique{ $f };
+ $unique{ $f } = 1;
+ push @unique, $f;
+ }
+
+ $self->{'fields'} = \@unique;
+ }
+
+ return wantarray ? @{ $self->{'fields'} || [] } : $self->{'fields'};
+}
+
+# ----------------------------------------------------------------------
+sub on_table {
+
+=pod
+
+=head2 on_table
+
+Gets or set the table name on which the trigger works.
+
+ $trigger->table('foo');
+
+=cut
+
+ my $self = shift;
+ my $arg = shift || '';
+ $self->{'on_table'} = $arg if $arg;
+ return $self->{'on_table'};
+}
+
+# ----------------------------------------------------------------------
+sub action {
+
+=pod
+
+=head2 action
+
+Gets or set the actions of the trigger.
+
+ $trigger->actions(
+ q[
+ BEGIN
+ select ...;
+ update ...;
+ END
+ ]
+ );
+
+=cut
+
+ my $self = shift;
+ my $arg = shift || '';
+ $self->{'action'} = $arg if $arg;
+ return $self->{'action'};
+}
+
+# ----------------------------------------------------------------------
+sub is_valid {
+
+=pod
+
+=head2 is_valid
+
+Determine whether the trigger is valid or not.
+
+ my $ok = $trigger->is_valid;
+
+=cut
+
+ my $self = shift;
+
+ for my $attr (
+ qw[ name perform_action_when database_event on_table action ]
+ ) {
+ return $self->error("No $attr") unless $self->$attr();
+ }
+
+ return $self->error("Missing fields for UPDATE ON") if
+ $self->database_event eq 'update_on' && !$self->fields;
+
+ return 1;
+}
+
+# ----------------------------------------------------------------------
+sub name {
+
+=pod
+
+=head2 name
+
+Get or set the trigger's name.
+
+ my $name = $trigger->name('foo');
+
+=cut
+
+ my $self = shift;
+ $self->{'name'} = shift if @_;
+ return $self->{'name'} || '';
+}
+
+# ----------------------------------------------------------------------
+sub order {
+
+=pod
+
+=head2 order
+
+Get or set the trigger's order.
+
+ my $order = $trigger->order(3);
+
+=cut
+
+ my ( $self, $arg ) = @_;
+
+ if ( defined $arg && $arg =~ /^\d+$/ ) {
+ $self->{'order'} = $arg;
+ }
+
+ return $self->{'order'} || 0;
+}
+
+1;
+
+# ----------------------------------------------------------------------
+
+=pod
+
+=head1 AUTHOR
+
+Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.
+
+=cut
projects / dbsrgits/SQL-Translator.git / commitdiff