rdf::trine::iterator::graph(3pm) [debian man page]
RDF::Trine::Iterator::Graph(3pm) User Contributed Perl Documentation RDF::Trine::Iterator::Graph(3pm) NAME
RDF::Trine::Iterator::Graph - Iterator class for graph query results VERSION
This document describes RDF::Trine::Iterator::Graph version 1.000 SYNOPSIS
use RDF::Trine::Iterator::Graph; my $iterator = RDF::Trine::Iterator::Graph->new( &data ); while (my $st = $iterator->next) { # $st is a RDF::Trine::Statement object print $st->as_string; } METHODS
Beyond the methods documented below, this class inherits methods from the RDF::Trine::Iterator class. "new ( @results, %args )" "new ( &results, %args )" Returns a new SPARQL Result interator object. Results must be either an reference to an array containing results or a CODE reference that acts as an iterator, returning successive items when called, and returning undef when the iterator is exhausted. $type should be one of: bindings, boolean, graph. "as_bindings ( $s, $p, $o )" Returns the iterator as a Bindings iterator, using the supplied triple nodes to determine the variable bindings. "materialize" Returns a materialized version of the current graph iterator. The materialization process will leave this iterator empty. The materialized iterator that is returned should be used for any future need for the iterator's data. "unique" Returns a Graph iterator that ensures the returned statements are unique. While the underlying RDF graph is the same regardless of uniqueness, the iterator's serialization methods assume the results are unique, and so use this method before serialization. Uniqueness is opt-in for efficiency concerns -- this method requires O(n) memory, and so may have noticeable effects on large graphs. "is_graph" Returns true if the underlying result is an RDF graph. "as_string ( $max_size [, $count] )" Returns a string table serialization of the stream data. "as_xml ( $max_size )" Returns an XML serialization of the stream data. "print_xml ( $fh, $max_size )" Prints an XML serialization of the stream data to the filehandle $fh. "as_json ( $max_size )" Returns a JSON serialization of the stream data. "as_hashref" Returns a hashref representing the model in an RDF/JSON-like manner. See "as_hashref" at RDF::Trine::Model for full documentation of the hashref format. "construct_args" Returns the arguments necessary to pass to the stream constructor _new to re-create this stream (assuming the same closure as the first DEPENDENCIES
JSON Scalar::Util BUGS
Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/perlrdf/issues>. AUTHOR
Gregory Todd Williams "<gwilliams@cpan.org>" COPYRIGHT
Copyright (c) 2006-2012 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-06-29 RDF::Trine::Iterator::Graph(3pm)
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RDF::Trine::Iterator::Bindings(3pm) User Contributed Perl Documentation RDF::Trine::Iterator::Bindings(3pm) NAME
RDF::Trine::Iterator::Bindings - Iterator class for bindings query results VERSION
This document describes RDF::Trine::Iterator::Bindings version 1.000 SYNOPSIS
use RDF::Trine::Iterator::Bindings; my $iterator = RDF::Trine::Iterator::Bindings->new( &data, @names ); while (my $row = $iterator->next) { # $row is a HASHref containing variable name -> RDF Term bindings my @vars = keys %$row; print $row->{ 'var' }->as_string; } METHODS
Beyond the methods documented below, this class inherits methods from the RDF::Trine::Iterator class. "new ( @results, @names, %args )" "new ( &results, @names, %args )" Returns a new SPARQL Result interator object. Results must be either a reference to an array containing results or a CODE reference that acts as an iterator, returning successive items when called, and returning undef when the iterator is exhausted. "materialize" Returns a materialized version of the current binding iterator. The materialization process will leave this iterator empty. The materialized iterator that is returned should be used for any future need for the iterator's data. "project ( @columns )" Returns a new stream that projects the current bindings to only the given columns. "join_streams ( $stream, $stream )" Performs a natural, nested loop join of the two streams, returning a new stream of joined results. "nested_loop_join ( $outer, $inner )" Performs a natural, nested loop join of the two streams, returning a new stream of joined results. Note that the values from the $inner iterator are fully materialized for this join, and the results of the join are in the order of values from the $outer iterator. This suggests that: * If sorting needs to be preserved, the $outer iterator should be used to determine the result ordering. * If one iterator is much smaller than the other, it should likely be used as the $inner iterator since materialization will require less total memory. "sorted_by" "binding_value_by_name ( $name )" Returns the binding of the named variable in the current result. "binding_value ( $i )" Returns the binding of the $i-th variable in the current result. "binding_values" Returns a list of the binding values from the current result. "binding_names" Returns a list of the binding names. "binding_name ( $i )" Returns the name of the $i-th result column. "bindings_count" Returns the number of variable bindings in the current result. "is_bindings" Returns true if the underlying result is a set of variable bindings. "as_json ( $max_size )" Returns a JSON serialization of the stream data. "as_xml ( $max_size )" Returns an XML serialization of the stream data. "as_string ( $max_size [, $count] )" Returns a string table serialization of the stream data. "as_statements ( @names )" Returns a RDF::Trine::Iterator::Graph with the statements of the stream. "print_xml ( $fh, $max_size )" Prints an XML serialization of the stream data to the filehandle $fh. "construct_args" Returns the arguments necessary to pass to the stream constructor _new to re-create this stream (assuming the same closure as the first argument). DEPENDENCIES
JSON Scalar::Util BUGS
Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/perlrdf/issues>. AUTHOR
Gregory Todd Williams "<gwilliams@cpan.org>" COPYRIGHT
Copyright (c) 2006-2012 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-06-29 RDF::Trine::Iterator::Bindings(3pm)