1RDF::Trine::Store::LangUusaegrePCroenfterriebnuctee(d3R)PDeFr:l:TDroicnuem:e:nSttaotrieo:n:LanguagePreference(3)
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NAME

6       RDF::Trine::Store::LanguagePreference - RDF Store proxy for filtering
7       language tagged literals
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VERSION

10       This document describes RDF::Trine::Store::LanguagePreference version
11       1.019
12

SYNOPSIS

14        use RDF::Trine::Store::LanguagePreference;
15

DESCRIPTION

17       RDF::Trine::Store::LanguagePreference provides a RDF::Trine::Store API
18       to filter the statements made available from some underlying store
19       object based on a users' language preferences (e.g. coming from an
20       Accept-Language HTTP header value).
21

METHODS

23       Beyond the methods documented below, this class inherits methods from
24       the RDF::Trine::Store class.
25
26       "new ( $store, { $lang1 => $q1, $lang2 => $q2, ... } )"
27           Returns a new storage object that will act as a proxy for the
28           $store object, filtering language literals based on the expressed
29           language preferences.
30
31       "new_with_config ( $hashref )"
32           Returns a new storage object configured with a hashref with certain
33           keys as arguments.
34
35           The "storetype" key must be "LanguagePreference" for this backend.
36
37           The following key must also be used:
38
39           "store"
40               A configuration hash for the underlying store object.
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42           "preferred_languages"
43               A hash reference mapping language tags to quality values in the
44               range [0, 1].  The referent may be changed between operations
45               to change the set of preferred languages used in statement
46               matching.
47
48       "new_with_config ( \%config )"
49           Returns a new RDF::Trine::Store object based on the supplied
50           configuration hashref.
51
52       "language_preferences"
53           Returns a hash of the language preference quality values.
54
55       "language_preference( $lang )"
56           Return the quality value preference for the given language.
57
58       "update_language_preference( $lang => $qvalue )"
59           Update the quality value preference for the given language.
60
61       "get_statements ( $subject, $predicate, $object [, $context] )"
62           Returns a stream object of all statements matching the specified
63           subject, predicate and objects. Any of the arguments may be undef
64           to match any value.
65
66       "count_statements ( $subject, $predicate, $object, $context )"
67           Returns a count of all the statements matching the specified
68           subject, predicate, object, and context. Any of the arguments may
69           be undef to match any value.
70
71       "qvalueForLanguage ( $language, \%cache )"
72           Returns the q-value for $language based on the current language
73           preference. %cache is used across multiple calls to this method for
74           performance reasons.
75
76       "siteQValueForLanguage ( $language )"
77           Returns an implementation-specific q-value preference for the given
78           $language. This method may be overridden by subclasses to control
79           the default preferred language.
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81       "availableLanguagesForStatement( $statement )"
82           Returns a list of language tags that are available in the
83           underlying store for the given statement object. For example, if
84           $statement represented the triple:
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86            dbpedia:Los_Angeles rdf:label "Los Angeles"@en
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88           and the underlying store contains the triples:
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90            dbpedia:Los_Angeles rdf:label "Los Angeles"@en
91            dbpedia:Los_Angeles rdf:label "ロサンゼルス"@ja
92            dbpedia:Los_Angeles rdf:label "Лос-Анджелес"@ru
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94           then the return value would be "('en', 'ja', 'ru')".
95
96       "languagePreferenceAllowsStatement ( $statement, \%cache )"
97           Returns true if the $statement is allowed by the current language
98           preference. %cache is used across multiple calls to this method for
99           performance reasons.
100
101       "supports ( [ $feature ] )"
102           If $feature is specified, returns true if the feature is supported
103           by the store, false otherwise. If $feature is not specified,
104           returns a list of supported features.
105

BUGS

107       Please report any bugs or feature requests to through the GitHub web
108       interface at <https://github.com/kasei/perlrdf/issues>.
109

AUTHOR

111       Gregory Todd Williams  "<gwilliams@cpan.org>"
112

114       Copyright (c) 2006-2012 Gregory Todd Williams. This program is free
115       software; you can redistribute it and/or modify it under the same terms
116       as Perl itself.
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120perl v5.30.0                      2019-R0D7F-:2:6Trine::Store::LanguagePreference(3)
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