package Search::Xapian::TermIterator;
use 5.006;
use strict;
use warnings;
use Carp;
require Exporter;
require DynaLoader;
our @ISA = qw(Exporter DynaLoader);
# Items to export into callers namespace by default. Note: do not export
# names by default without a very good reason. Use EXPORT_OK instead.
# Do not simply export all your public functions/methods/constants.
# If you do not need this, moving things directly into @EXPORT or @EXPORT_OK
# will save memory.
our @EXPORT_OK = ( );
our @EXPORT = qw( );
=head1 NAME
Search::Xapian::TermIterator - Iterate over sets of terms.
=head1 DESCRIPTION
This object represents a stream of terms. It overloads ++ for
advancing the iterator, or you can explicitly call the inc method.
This class also overloads 'eq',ne, and "" (stringification)
=head1 METHODS
=over 4
=item new
Constructor. Defaults to a uninitialized iterator.
=item clone
=item inc
Advance the iterator by one. (Called implictly by '++' overloading )
=item skip_to <tname>
Skip the iterator to term tname, or the first term after tname if tname
isn't in the list of terms being iterated.
=item get_termname
Get the name of the current term.
=item get_wdf
Return the wdf of the current term (if meaningful).
=item get_termfreq
Return the term frequency of the current term (if meaningful).
=item positionlist_begin
Return L<Search::Xapian:::PositionIterator> pointing to start of positionlist for current term.
=item positionlist_end
Return L<Search::Xapian:::PositionIterator> pointing to end of positionlist for current term.
=item get_description
Returns a string describing this object.
=item equal <termiterator>
Checks if a termiterator is the same as this termiterator. Also overloaded as
the 'eq' and '!=' operators.
=item nequal <termiterator>
Checks if a termiterator is different from this termiterator. Also overloaded
as the 'ne' and '!=' operators.
=cut
# Preloaded methods go here.
use overload '++' => sub { $_[0]->inc() },
'=' => sub { $_[0]->clone() },
'eq' => sub { $_[0]->equal($_[1]) },
'ne' => sub { $_[0]->nequal($_[1]) },
'==' => sub { $_[0]->equal($_[1]) },
'!=' => sub { $_[0]->nequal($_[1]) },
'""' => sub { $_[0]->get_termname() },
'fallback' => 1;
sub clone() {
my $self = shift;
my $class = ref( $self );
my $copy = new2( $self );
bless $copy, $class;
return $copy;
}
sub new() {
my $class = shift;
my $iterator;
my $invalid_args;
if( scalar(@_) == 0 ) {
$iterator = new1();
} elsif( scalar(@_) == 1 and ref( $_[1] ) eq $class ) {
$iterator = new2(@_);
} else {
$invalid_args = 1;
}
if( $invalid_args ) {
Carp::carp( "USAGE: $class->new(), $class->new(\$iterator)" );
exit;
}
bless $iterator, $class;
return $iterator;
}
1;
=back
=head1 SEE ALSO
L<Search::Xapian>,L<Search::Xapian::Document>
=cut