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=head1 NAME

  RT::Links - A collection of Link objects

=head1 SYNOPSIS

  use RT::Links;
  my $links = RT::Links->new($CurrentUser);

=head1 DESCRIPTION


=head1 METHODS



=cut


package RT::Links;

use strict;
use warnings;


use RT::Link;

use base 'RT::SearchBuilder';

sub Table { 'Links'}


use RT::URI;

sub Limit  {
    my $self = shift;
    my %args = ( ENTRYAGGREGATOR => 'AND',
		 OPERATOR => '=',
		 @_);

    # If we're limiting by target, order by base
    # (Order by the thing that's changing)

    if ( ($args{'FIELD'} eq 'Target') or 
	 ($args{'FIELD'} eq 'LocalTarget') ) {
	$self->OrderByCols(
            { ALIAS => 'main', FIELD => 'LocalBase', ORDER => 'ASC' },
            { ALIAS => 'main', FIELD => 'Base', ORDER => 'ASC' },
        );
    }
    elsif ( ($args{'FIELD'} eq 'Base') or 
	    ($args{'FIELD'} eq 'LocalBase') ) {
	$self->OrderByCols(
            { ALIAS => 'main', FIELD => 'LocalTarget', ORDER => 'ASC' },
            { ALIAS => 'main', FIELD => 'Target', ORDER => 'ASC' },
        );
    }
    

    $self->SUPER::Limit(%args);
}


=head2 LimitRefersTo URI

find all things that refer to URI

=cut

sub LimitRefersTo {
    my $self = shift;
    my $URI = shift;

    $self->Limit(FIELD => 'Type', VALUE => 'RefersTo');
    $self->Limit(FIELD => 'Target', VALUE => $URI);
}


=head2 LimitReferredToBy URI

find all things that URI refers to

=cut

sub LimitReferredToBy {
    my $self = shift;
    my $URI = shift;

    $self->Limit(FIELD => 'Type', VALUE => 'RefersTo');
    $self->Limit(FIELD => 'Base', VALUE => $URI);
}

# }}}

=head2 NewItem

Returns an empty new RT::Link item

=cut

sub NewItem {
    my $self = shift;
    return(RT::Link->new($self->CurrentUser));
}

sub AddRecord {
    my $self = shift;
    my $record = shift;
    return unless $self->IsValidLink($record);

    push @{$self->{'items'}}, $record;
    $self->{'rows'}++;
}

=head2 IsValidLink

if linked to a local ticket and is deleted, then the link is invalid.

=cut

sub IsValidLink {
    my $self = shift;
    my $link = shift;

    return unless $link && ref $link && $link->Target && $link->Base;

    # Skip links to local objects thast are deleted
    return
      if $link->TargetURI->IsLocal
          && ( UNIVERSAL::isa( $link->TargetObj, "RT::Ticket" )
              && $link->TargetObj->__Value('status') eq "deleted"
              || UNIVERSAL::isa( $link->BaseObj, "RT::Ticket" )
              && $link->BaseObj->__Value('status') eq "deleted" );

    return 1;
}

RT::Base->_ImportOverlays();

1;
