/usr/share/perl5/RDF/Redland/QueryResults.pm is in librdf-perl 1.0.17.1+dfsg-1.3+b1.
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#
# QueryResults.pm - Redland Perl RDF Query Results module
#
# Copyright (C) 2004-2005 David Beckett - http://www.dajobe.org/
# Copyright (C) 2004-2005 University of Bristol - http://www.bristol.ac.uk/
#
# This package is Free Software and part of Redland http://librdf.org/
#
# It is licensed under the following three licenses as alternatives:
# 1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
# 2. GNU General Public License (GPL) V2 or any newer version
# 3. Apache License, V2.0 or any newer version
#
# You may not use this file except in compliance with at least one of
# the above three licenses.
#
# See LICENSE.html or LICENSE.txt at the top of this package for the
# full license terms.
#
#
#
package RDF::Redland::QueryResults;
use RDF::Redland::Stream;
use strict;
=pod
=head1 NAME
RDF::Redland::QueryResults - Redland RDF Syntax Query Results Class
=head1 SYNOPSIS
use RDF::Redland;
...
my $query=new RDF::Redland::Query("query string", undef, undef, "sparql");
my $results=$model->query_execute($query);
# or my $results=$query->execute($model);
while(!$results->finished) {
for (my $i=0; $i < $results->bindings_count(); $i++) {
my $name=$results->binding_name($i);
my $value=$results->binding_value($i);
# ... do something with the results
}
$results->next_result;
}
The $results in the example is an object of class RDF::Redland::QueryResults.
=head1 DESCRIPTION
This class represents queries of various syntaxes over an
RDF::Redland::Model returning a sequence of results that bind
variable names to RDF::Redland::Node values.
=cut
######################################################################
=pod
=head1 CONSTRUCTOR
There are no public constructors.
=cut
# CONSTRUCTOR
sub new ($$) {
my($proto,$object)=@_;
my $class = ref($proto) || $proto;
my $self = {};
$self->{QUERYRESULTS}=$object;
bless ($self, $class);
return $self;
}
# DESTRUCTOR
sub DESTROY ($) {
warn "RDF::Redland::QueryResults DESTROY\n" if $RDF::Redland::Debug;
&RDF::Redland::CORE::librdf_free_query_results(shift->{QUERYRESULTS});
}
=head1 METHODS
=over
=item count
Return the number of current results from the query.
=cut
sub count ($) {
my($self)=@_;
return &RDF::Redland::CORE::librdf_query_results_get_count($self->{QUERYRESULTS});
}
=item finished
Return non-0 if the results have been exhausted.
=cut
sub finished ($) {
my($self)=@_;
return &RDF::Redland::CORE::librdf_query_results_finished($self->{QUERYRESULTS});
}
=item binding_name INDEX
Get the name of variable binding I<INDEX> in the array of variable names.
=cut
sub binding_name ($$) {
my($self,$index)=@_;
return &RDF::Redland::CORE::librdf_query_results_get_binding_name($self->{QUERYRESULTS},$index);
}
=item binding_names
Get the names all of the variable bindings as an array.
=cut
sub binding_names ($) {
my($self)=shift;
my(@names);
my $count=&RDF::Redland::CORE::librdf_query_results_get_bindings_count($self->{QUERYRESULTS});
for (my $i=0; $i < $count; $i++) {
push(@names, $self->binding_name($i));
}
return @names;
}
=item binding_value INDEX
Get the value of the variable binding I<INDEX> in the current query result.
=cut
sub binding_value ($$) {
my($self,$index)=@_;
my $node=&RDF::Redland::CORE::librdf_query_results_get_binding_value($self->{QUERYRESULTS},$index);
RDF::Redland::Node->_new_from_object($node);
}
=item binding_values
Get the values of all of the variable bindings in the current query result.
=cut
sub binding_values ($) {
my($self)=shift;
my(@values);
my $count=&RDF::Redland::CORE::librdf_query_results_get_bindings_count($self->{QUERYRESULTS});
for (my $i=0; $i < $count; $i++) {
push(@values, $self->binding_value($i));
}
return @values;
}
=item binding_value_by_name NAME
Get the value of the variable binding I<NAME> in the current query result.
=cut
sub binding_value_by_name ($$) {
my($self,$name)=@_;
my $node=&RDF::Redland::CORE::librdf_query_results_get_binding_value_by_name($self->{QUERYRESULTS},$name);
RDF::Redland::Node->_new_from_object($node);
}
=item bindings
Get the variable names and values of the current query result as a hash
=cut
sub bindings ($) {
my($self)=shift;
my(%results);
my $count=&RDF::Redland::CORE::librdf_query_results_get_bindings_count($self->{QUERYRESULTS});
for (my $i=0; $i < $count; $i++) {
$results{$self->binding_name($i)}=$self->binding_value($i);
}
return %results;
}
=item bindings_count
Return the number of variable bindings.
=cut
sub bindings_count ($) {
my($self)=@_;
return &RDF::Redland::CORE::librdf_query_results_get_bindings_count($self->{QUERYRESULTS});
}
=item next_result
Move to the next query result.
=cut
sub next_result ($) {
my($self)=@_;
return &RDF::Redland::CORE::librdf_query_results_next($self->{QUERYRESULTS});
}
=item as_stream
Return a new RDF::Redland::Stream object representing the query results
as an RDF Graph.
=cut
sub as_stream($) {
my($self)=@_;
die "Query results is not in RDF graph format"
unless $self->is_graph;
my $stream=&RDF::Redland::CORE::librdf_query_results_as_stream($self->{QUERYRESULTS});
return new RDF::Redland::Stream($stream,$self);
}
=item to_string [FORMAT-URI [BASE-URI]]
Serialize to a string syntax in format I<FORMAT-URI> using the optional
I<BASE-URI>. The default format when none is given is determined by
librdf_query_results_to_string.
=cut
sub to_string($;$$) {
my($self, $format_uri, $base_uri)=@_;
$format_uri ||= undef;
$base_uri ||= undef;
if($self->is_graph) {
my $tmpstorage=RDF::Redland::Storage->new("memory");
my $tmpmodel=RDF::Redland::Model->new($tmpstorage, "");
$tmpmodel->add_statements($self->as_stream);
my $serializer=RDF::Redland::Serializer->new();
return $serializer->serialize_model_to_string($base_uri, $tmpmodel);
}
if(!$self->is_boolean && !$self->is_bindings) {
die "Unknown query result format cannot be written as a string";
}
if($format_uri && !ref($format_uri)) {
$format_uri = RDF::Redland::URI->new($format_uri);
}
my $rformat_uri=$format_uri ? $format_uri->{URI} : undef;
if($base_uri && !ref($base_uri)) {
$base_uri = RDF::Redland::URI->new($base_uri);
}
my $rbase_uri=$base_uri ? $base_uri->{URI} : undef;
warn "RDF::Redland::QueryResults format URI ".$format_uri->as_string." base URI ".($base_uri ? $base_uri->as_string : "undef")."\n"
if $RDF::Redland::Debug;
return &RDF::Redland::CORE::librdf_query_results_to_string($self->{QUERYRESULTS}, $rformat_uri, $rbase_uri);
}
=item is_bindings
Return non-0 if the query results format is variable bindings
=cut
sub is_bindings($) {
my($self)=shift;
return &RDF::Redland::CORE::librdf_query_results_is_bindings($self->{QUERYRESULTS});
}
=item is_boolean
Return non-0 if the query results format is a boolean
=cut
sub is_boolean($) {
my($self)=shift;
return &RDF::Redland::CORE::librdf_query_results_is_boolean($self->{QUERYRESULTS});
}
=item is_graph
Return non-0 if the query results format is an RDF graph
=cut
sub is_graph($) {
my($self)=shift;
return &RDF::Redland::CORE::librdf_query_results_is_graph($self->{QUERYRESULTS});
}
=item get_boolean
Get the boolean query result; non-0 is true.
=cut
sub get_boolean($) {
my($self)=shift;
die "Query result is not in boolean format"
unless $self->is_boolean;
return &RDF::Redland::CORE::librdf_query_results_get_boolean($self->{QUERYRESULTS});
}
=pod
=back
=head1 SEE ALSO
L<RDF::Redland::Query>
=head1 AUTHOR
Dave Beckett - http://www.dajobe.org/
=cut
1;
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