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package CQL::Relation;
use strict;
use warnings;
use Class::Accessor;
use CQL::ModifierSet;
use base qw( CQL::Node );
=head1 NAME
CQL::Relation - object for CQL Relations
=head1 SYNOPSIS
=head1 DESCRIPTION
CQL::Relation represents the common CQL relation operations ( =, E<gt>,
E<lt>, any, all and exact. In addition modifiers may be applied (stem,
relevant, fuzzy, phonetic). The operators are passed into the constructor
as the base relation.
=head1 METHODS
=head2 new()
Creates a new CQL::Relation object with the specified base relation.
=cut
sub new {
my ($class,$base) = @_;
my $ms = CQL::ModifierSet->new( $base );
return bless { modifierSet => $ms }, ref($class) || $class;
}
=head2 getBase()
Returns the base relation with which the CQL::Relation object was originally
created.
=cut
sub getBase {
return shift->{modifierSet}->getBase();
}
=head2 addModifier()
Adds a new relation modifier to the specified CQLRelation.
Typical relation modifiers include relevant, fuzzy stem and phonetic.
On the whole, these modifiers have a meaningful interpretation
only for the text relations.
=cut
sub addModifier {
my ($self,$modifier) = @_;
$self->{modifierSet}->addModifier( undef, $modifier );
}
=head2 getModifiers()
Returns a list of modifiers associated with a CQL relation.
=cut
sub getModifiers {
return shift->{modifierSet}->getModifiers();
}
=head2 toCQL()
=cut
sub toCQL {
return shift->{modifierSet}->toCQL();
}
=head2 toSwish()
=cut
sub toSwish {
return shift->{modifierSet}->toSwish();
}
=head2 toXCQL()
=cut
sub toXCQL {
my ($self,$level) = @_;
my $xml = $self->{modifierSet}->toXCQL( $level, "relation" );
return $self->addNamespace( $level, $xml );
}
=head2 toLucene()
=cut
sub toLucene {
return shift->{modifierSet}->toLucene();
}
1;
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