-=head2 LimitAttribute PARAMHASH
-
-Takes NAME, OPERATOR and VALUE to find records that has the
-matching Attribute.
-
-If EMPTY is set, also select rows with an empty string as
-Attribute's Content.
-
-If NULL is set, also select rows without the named Attribute.
-
-=cut
-
-my %Negate = (
- '=' => '!=',
- '!=' => '=',
- '>' => '<=',
- '<' => '>=',
- '>=' => '<',
- '<=' => '>',
- 'LIKE' => 'NOT LIKE',
- 'NOT LIKE' => 'LIKE',
- 'IS' => 'IS NOT',
- 'IS NOT' => 'IS',
-);
-
-sub LimitAttribute {
- my ($self, %args) = @_;
- my $clause = 'ALIAS';
- my $operator = ($args{OPERATOR} || '=');
-
- if ($args{NULL} and exists $args{VALUE}) {
- $clause = 'LEFTJOIN';
- $operator = $Negate{$operator};
- }
- elsif ($args{NEGATE}) {
- $operator = $Negate{$operator};
- }
-
- my $alias = $self->Join(
- TYPE => 'left',
- ALIAS1 => $args{ALIAS} || 'main',
- FIELD1 => 'id',
- TABLE2 => 'Attributes',
- FIELD2 => 'ObjectId'
- );
-
- my $type = ref($self);
- $type =~ s/(?:s|Collection)$//; # XXX - Hack!
-
- $self->Limit(
- $clause => $alias,
- FIELD => 'ObjectType',
- OPERATOR => '=',
- VALUE => $type,
- );
- $self->Limit(
- $clause => $alias,
- FIELD => 'Name',
- OPERATOR => '=',
- VALUE => $args{NAME},
- ) if exists $args{NAME};
-
- return unless exists $args{VALUE};
-
- $self->Limit(
- $clause => $alias,
- FIELD => 'Content',
- OPERATOR => $operator,
- VALUE => $args{VALUE},
- );
-
- # Capture rows with the attribute defined as an empty string.
- $self->Limit(
- $clause => $alias,
- FIELD => 'Content',
- OPERATOR => '=',
- VALUE => '',
- ENTRYAGGREGATOR => $args{NULL} ? 'AND' : 'OR',
- ) if $args{EMPTY};
-
- # Capture rows without the attribute defined
- $self->Limit(
- %args,
- ALIAS => $alias,
- FIELD => 'id',
- OPERATOR => ($args{NEGATE} ? 'IS NOT' : 'IS'),
- VALUE => 'NULL',
- ) if $args{NULL};
-}
-