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<?php
namespace SMW\SQLStore\Lookup;
use RuntimeException;
use SMW\DIProperty;
use SMW\Exception\PropertyLabelNotResolvedException;
use SMW\SQLStore\SQLStore;
use SMW\Store;
use SMWDIError as DIError;
use SMWRequestOptions as RequestOptions;
/**
* @license GNU GPL v2+
* @since 2.2
*
* @author mwjames
* @author Nischay Nahata
*/
class UndeclaredPropertyListLookup implements ListLookup {
/**
* @var Store
*/
private $store;
/**
* @var string
*/
private $defaultPropertyType;
/**
* @var RequestOptions
*/
private $requestOptions;
/**
* @since 2.2
*
* @param Store $store
* @param string $defaultPropertyType
* @param RequestOptions $requestOptions|null
*/
public function __construct( Store $store, $defaultPropertyType, RequestOptions $requestOptions = null ) {
$this->store = $store;
$this->defaultPropertyType = $defaultPropertyType;
$this->requestOptions = $requestOptions;
}
/**
* @since 2.2
*
* @return DIProperty[]
* @throws RuntimeException
*/
public function fetchList() {
if ( $this->requestOptions === null ) {
throw new RuntimeException( "Missing requestOptions" );
}
// Wanted Properties must have the default type
$propertyTable = $this->getPropertyTableForType( $this->defaultPropertyType );
if ( $propertyTable->isFixedPropertyTable() ) {
return [];
}
return $this->buildPropertyList( $this->selectPropertiesFromTable( $propertyTable ) );
}
/**
* @since 2.2
*
* @return boolean
*/
public function isFromCache() {
return false;
}
/**
* @since 2.2
*
* @return integer
*/
public function getTimestamp() {
return wfTimestamp( TS_UNIX );
}
/**
* @since 2.2
*
* @return string
*/
public function getHash() {
return __METHOD__ . '#' . ( $this->requestOptions !== null ? $this->requestOptions->getHash() : '' );
}
private function selectPropertiesFromTable( $propertyTable ) {
$options = $this->store->getSQLOptions( $this->requestOptions, 'title' );
$idTable = SQLStore::ID_TABLE;
$options['ORDER BY'] = 'count DESC';
// Postgres Error: 42803 ERROR: ...smw_title must appear in the GROUP BY
// clause or be used in an aggregate function
$options['GROUP BY'] = 'smw_id, smw_title';
$conditions = [
'smw_id > ' . SQLStore::FIXED_PROPERTY_ID_UPPERBOUND,
'smw_namespace' => SMW_NS_PROPERTY,
'smw_proptable_hash IS NULL',
'smw_iw' => '',
'smw_subobject' => ''
];
$joinCond = 'p_id';
foreach ( $this->requestOptions->getExtraConditions() as $extaCondition ) {
if ( isset( $extaCondition['filter.unapprove'] ) ) {
$joinCond = 'o_id';
}
}
$res = $this->store->getConnection( 'mw.db' )->select(
[ $idTable, $propertyTable->getName() ],
[ 'smw_id', 'smw_title', 'COUNT(*) as count' ],
$conditions,
__METHOD__,
$options,
[
$idTable => [
'INNER JOIN', "$joinCond=smw_id"
]
]
);
return $res;
}
private function buildPropertyList( $res ) {
$result = [];
foreach ( $res as $row ) {
$result[] = [ $this->addPropertyFor( $row->smw_title ), $row->count ];
}
return $result;
}
private function addPropertyFor( $title ) {
try {
$property = new DIProperty( $title );
} catch ( PropertyLabelNotResolvedException $e ) {
$property = new DIError( new \Message( 'smw_noproperty', [ $title ] ) );
}
return $property;
}
private function getPropertyTableForType( $type ) {
$propertyTables = $this->store->getPropertyTables();
$tableIdForType = $this->store->findTypeTableId( $type );
if ( isset( $propertyTables[$tableIdForType] ) ) {
return $propertyTables[$tableIdForType];
}
throw new RuntimeException( "Tried to access a table that doesn't exist for {$type}." );
}
}
|
