NAME

Attean::API::Binding - Name to term bindings

VERSION

This document describes Attean::API::Binding version 0.021

DESCRIPTION

The Attean::API::Binding role defines a common API for all objects that map names to Attean::API::Term objects. This includes triples, quads, and SPARQL results (variable bindings).

REQUIRED METHODS

Classes consuming this role must provide the following methods:

value( $name )

Returns the Attean::API::Term object mapped to the variable named $name, or undef if no such term is mapped.

variables

Returns a list of the variable names mapped to Attean::API::Term objects in this mapping.

apply_map( $mapper )

Returns a new mapping object (of the same class as the referent) with term objects rewritten using the supplied Attean::Mapper object $mapper.

METHODS

This role provides default implementations of the following methods:

mapping

Returns a HASH mapping variable names to Attean::API::Term objects.

values

Returns a list of Attean::API::Term objects corresponding to the variable names returned by the referent's variables method.

tuples_string

Returns a string serialization of the Attean::API::Term objects in the order they are returned by the referent's values method.

as_string

Returns a string serialization of the variable bindings.

has_blanks

Returns true if any variable is bound to an Attean::API::Blank term, false otherwise.

is_ground

Returns tue is all the bound values consume Attean::API::Term, false otherwise.

values_consuming_role( $role )

Returns the list of bound values that consume $role.

tree_attributes

Returns the variables which are bound in this object.

apply_bindings( $binding )

Construct a new binding by replacing variables with their bound values from $binding.

parse ( $string )

Returns a triple or quad pattern object using the variables and/or terms parsed from $string in SPARQL syntax.

project( @keys )

Returns a new Attean::Result binding which contains variable-value mappings from the invocant for every variable name in @keys.

BUGS

Please report any bugs or feature requests to through the GitHub web interface at https://github.com/kasei/attean/issues.

SEE ALSO

AUTHOR

Gregory Todd Williams <gwilliams@cpan.org>

COPYRIGHT

Copyright (c) 2014--2018 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.