51 lines
1.5 KiB
PHP
51 lines
1.5 KiB
PHP
<?php
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/**
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* list_prefixes lists all content prefixes known to this WissKI.
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* Prefixes are not filtered, and may contain duplicates.
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*/
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function list_prefixes() {
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$prefixes = [];
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$storage = \Drupal::entityTypeManager()->getStorage('wisski_salz_adapter');
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foreach ($storage->loadMultiple() as $adapter) {
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// load all the prefixes from the triplestore
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$engine = $adapter->getEngine();
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getTriplestorePrefixes($adapter->getEngine(), $prefixes);
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// read the configuration to check if we have a default graph
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$conf = $engine->getConfiguration();
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if(!array_key_exists('default_graph', $conf)) {
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continue;
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}
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$prefixes[] = $conf['default_graph'];
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}
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return $prefixes;
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}
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function getTriplestorePrefixes($engine, &$prefixes) {
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// some adapters don't support a query method!
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if (!method_exists($engine, 'directQuery')) return NULL;
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$results = $engine->directQuery('
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select distinct ?base where {
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{
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select distinct ?iri where {
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{
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select distinct (?s as ?iri) { ?s ?p ?o }
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} union {
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select distinct (?o as ?iri) { ?s ?p ?o FILTER(isiri(?o)) }
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}
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}
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}
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BIND(replace(str(?iri), "/[^/]*/?$", "/") as ?base)
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FILTER(!REGEX(?base, "/wisski/navigate/[\\\\d]+/$"))
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} ORDER BY ?base');
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if (!$results) return FALSE;
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foreach($results as $result) {
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$prefixes[] = $result->base->getValue();
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}
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return TRUE;
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}
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