Attean::API::Binding - Name to term bindings
This document describes Attean::API::Binding version 0.033
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).
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.
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.
- "sameTerms( $other )"
- "equals( $other )"
- "blanks"
- Returns all the values in this mapping (recursively, if any values are
embedded bindings) that are blank nodes.
- "referenced_variables"
- Returns a list of the names of any variable values that are referenced in
this binding (recursively, if any values are embedded bindings).
- "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.
Please report any bugs or feature requests to through the GitHub
web interface at <https://github.com/kasei/attean/issues>.
Gregory Todd Williams
"<gwilliams@cpan.org>"
Copyright (c) 2014--2022 Gregory Todd Williams. This program is
free software; you can redistribute it and/or modify it under the same terms
as Perl itself.