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<?php
namespace SMW\MediaWiki\Api\Browse;
use SMW\DataTypeRegistry;
use SMW\DataValueFactory;
use SMW\RequestOptions;
use SMW\DIProperty;
use SMW\SQLStore\SQLStore;
use SMW\Store;
use SMWDataItem as DataItem;
use SMWDITime as DIime;
use SMW\SQLStore\Lookup\ProximityPropertyValueLookup;
/**
* @license GNU GPL v2+
* @since 3.0
*
* @author mwjames
*/
class PValueLookup extends Lookup {
const VERSION = 1;
/**
* @var Store
*/
private $store;
/**
* @since 3.0
*
* @param Store $store
*/
public function __construct( Store $store ) {
$this->store = $store;
}
/**
* @since 3.0
*
* @return string|integer
*/
public function getVersion() {
return __METHOD__ . self::VERSION;
}
/**
* @since 3.0
*
* @param array $parameters
*
* @return array
*/
public function lookup( array $parameters ) {
$limit = 20;
$offset = 0;
if ( isset( $parameters['limit'] ) ) {
$limit = (int)$parameters['limit'];
}
if ( isset( $parameters['offset'] ) ) {
$offset = (int)$parameters['offset'];
}
$res = [];
$continueOffset = 0;
$property = null;
$sort = false;
$count = 0;
if ( isset( $parameters['property'] ) ) {
$property = $parameters['property'];
// Get the last which represents the final output
// Foo.Bar.Foobar.Baz
if ( strpos( $property, '.' ) !== false ) {
$chain = explode( '.', $property );
$property = array_pop( $chain );
}
}
if ( $property === '' || $property === null ) {
return [];
}
// Generally we don't want to sort results to avoid having the DB to use
// temporary tables/filesort when the value pool is very large
if ( isset( $parameters['sort'] ) ) {
$sort = in_array( strtolower( $parameters['sort'] ), [ 'asc', 'desc' ] ) ? $parameters['sort'] : 'asc';
}
if ( isset( $parameters['search'] ) ) {
$opts = new RequestOptions();
$opts->limit = $limit;
$opts->offset = $offset;
$opts->sort = $sort;
$property = DIProperty::newFromUserLabel(
$property
);
$proximityPropertyValueLookup = $this->store->service(
'ProximityPropertyValueLookup'
);
$res = $proximityPropertyValueLookup->lookup(
$property,
$parameters['search'],
$opts
);
if ( $this->is_iterable( $res ) ) {
$count = count( $res );
}
if ( $count > $limit ) {
$continueOffset = $offset + $count;
array_pop( $res );
}
}
// Changing this output format requires to set a new version
$res = [
'query' => $res,
'query-continue-offset' => $continueOffset,
'version' => self::VERSION,
'meta' => [
'type' => 'pvalue',
'limit' => $limit,
'count' => $count
]
];
return $res;
}
private function is_iterable( $obj ) {
return is_array( $obj ) || ( is_object( $obj ) && ( $obj instanceof \Traversable ) );
}
}
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