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<?php
namespace SMW\MediaWiki\Api\Browse;
use SMW\DIProperty;
use Exception;
use SMW\Store;
use SMW\DIWikiPage;
use SMW\RequestOptions;
use SMW\StringCondition;
use SMW\ApplicationFactory;
use SMW\DataValueFactory;
/**
* @license GNU GPL v2+
* @since 3.0
*
* @author mwjames
*/
class PSubjectLookup 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'];
}
$list = [];
$continueOffset = 0;
$property = null;
$value = null;
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 ( isset( $parameters['value'] ) ) {
$value = $parameters['value'];
}
if ( $property === '' || $property === null ) {
return [];
}
list( $list, $continueOffset ) = $this->findPropertySubjects(
$property,
$value,
$limit,
$offset,
$parameters
);
// Changing this output format requires to set a new version
$res = [
'query' => $list,
'query-continue-offset' => $continueOffset,
'version' => self::VERSION,
'meta' => [
'type' => 'psubject',
'limit' => $limit,
'count' => count( $list )
]
];
return $res;
}
private function findPropertySubjects( $property, $value, $limit, $offset, $parameters ) {
$list = [];
$dataItem = null;
$property = DIProperty::newFromUserLabel( $property );
if ( $value !== '' && $value !== null ) {
$dataItem = DataValueFactory::getInstance()->newDataValueByProperty( $property, $value )->getDataItem();
}
$continueOffset = 0;
$count = 0;
$requestOptions = $this->newRequestOptions( $parameters );
$res = $this->store->getPropertySubjects(
$property,
$dataItem,
$requestOptions
);
foreach ( $res as $dataItem ) {
if ( !$dataItem instanceof DIWikiPage ) {
continue;
}
if ( isset( $parameters['title-prefix'] ) && (bool)$parameters['title-prefix'] === false ) {
$list[] = $dataItem->getTitle()->getText();
} else {
$list[] = $dataItem->getTitle()->getPrefixedText();
}
}
if ( $this->is_iterable( $res ) ) {
$count = count( $res );
}
if ( $count > $limit ) {
$continueOffset = $offset + $count;
array_pop( $list );
}
return [ $list, $continueOffset ];
}
private function newRequestOptions( $parameters ) {
$limit = 20;
$offset = 0;
$search = '';
if ( isset( $parameters['limit'] ) ) {
$limit = (int)$parameters['limit'];
}
if ( isset( $parameters['offset'] ) ) {
$offset = (int)$parameters['offset'];
}
$requestOptions = new RequestOptions();
$requestOptions->sort = true;
$requestOptions->setLimit( $limit + 1 );
$requestOptions->setOffset( $offset );
if ( isset( $parameters['search'] ) && $parameters['search'] !== '' ) {
$search = $parameters['search'];
if ( $search !== '' && $search{0} !== '_' ) {
$search = str_replace( "_", " ", $search );
}
$requestOptions->addStringCondition(
$search,
StringCondition::STRCOND_MID
);
// Disjunctive condition to allow for auto searches to match foaf OR Foaf
$requestOptions->addStringCondition(
ucfirst( $search ),
StringCondition::STRCOND_MID,
true
);
// Allow something like FOO to match the search string `foo`
$requestOptions->addStringCondition(
strtoupper( $search ),
StringCondition::STRCOND_MID,
true
);
$requestOptions->addStringCondition(
strtolower( $search ),
StringCondition::STRCOND_MID,
true
);
}
return $requestOptions;
}
private function is_iterable( $obj ) {
return is_array( $obj ) || ( is_object( $obj ) && ( $obj instanceof \Traversable ) );
}
}
|
