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<?php
namespace SMW\Elastic\QueryEngine;
use Psr\Log\LoggerAwareTrait;
use SMW\DataTypeRegistry;
use SMW\DIProperty;
use SMW\Store;
use SMWQuery as Query;
/**
* @license GNU GPL v2+
* @since 3.0
*
* @author mwjames
*/
class SortBuilder {
use LoggerAwareTrait;
/**
* @var Store
*/
private $store;
/**
* @var FieldMapper
*/
private $fieldMapper;
/**
* @var string
*/
private $scoreField;
/**
* @var boolean
*/
private $isScoreSort = false;
/**
* @since 3.0
*
* @param Store $store
*/
public function __construct( Store $store ) {
$this->store = $store;
$this->fieldMapper = new FieldMapper();
}
/**
* @since 3.0
*
* @param string $scoreField
*/
public function setScoreField( $scoreField ) {
$this->scoreField = $scoreField;
}
/**
* @since 3.0
*
* @return boolean
*/
public function isScoreSort() {
return $this->isScoreSort;
}
/**
* @since 3.0
*
* @param Query $query
*
* @return array
*/
public function makeSortField( Query $query ) {
// @see https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-sort.html#_memory_considerations
// "... the relevant sorted field values are loaded into memory. This means
// that per shard, there should be enough memory ... string based types,
// the field sorted on should not be analyzed / tokenized ... numeric
// types it is recommended to explicitly set the type to narrower types"
$this->isScoreSort = $query->getOption( Query::SCORE_SORT );
if ( $query->getOption( Query::SCORE_SORT ) ) {
return [ [ '_score' => [ 'order' => $query->getOption( Query::SCORE_SORT ) ] ], [], false, false];
}
return $this->getFields( $query->getSortKeys() );
}
private function getFields( array $sortKeys ) {
$isRandom = false;
$isConstantScore = true;
$sort = [];
$sortFields = [];
$sortKeysCount = count( $sortKeys );
foreach ( $sortKeys as $key => $order ) {
$order = strtolower( $order );
$isRandom = strpos( $order, 'rand' ) !== false;
if ( strtolower( $key ) === $this->scoreField ) {
$key = '_score';
$this->isScoreSort = true;
$isConstantScore = false;
}
if ( $key === '' || $key === '#' ) {
$this->addDefaultField( $sort, $order, $sortKeysCount );
} else {
$this->addField( $sort, $sortFields, $key, $order );
}
}
return [ $sort, $sortFields, $isRandom, $isConstantScore ];
}
private function addDefaultField( &$sort, $order, $sortKeysCount ) {
$sort['subject.sortkey.sort'] = [ 'order' => $order ];
// Add title as extra criteria in case an entity uses the same sortkey
// to clarify its relative position, @see T:P0416#8
// Only add the title as determining factor when no other sort parameter
// is available
if ( $sortKeysCount == 1 ) {
$sort['subject.title.sort'] = [ 'order' => $order ];
}
}
private function addField( &$sort, &$sortFields, $key, $order ) {
$dataTypeRegistry = DataTypeRegistry::getInstance();
$chain = false;
// Chain?
if ( strpos( $key, '.' ) !== false ) {
$list = explode( '.', $key );
$last = current( $list );
} else {
$list = [ $key ];
}
foreach ( $list as $key ) {
if ( $key === '_score' ) {
$field = '_score';
} else {
$property = DIProperty::newFromUserLabel( $key );
$field = $this->fieldMapper->getField( $property, 'Field' );
$pid = $this->fieldMapper->getPID(
$this->store->getObjectIds()->getSMWPropertyID( $property )
);
// Only record the last key to be used as possible existential
// enforcement
if ( $chain === false ) {
$sortFields[] = "$pid.$field";
}
// Use special sort field on mapped fields which is not analyzed
if ( $this->sort_field( $field ) ) {
$field = "$field.sort";
}
$field = "$pid.$field";
}
if ( !isset( $sort[$field] ) ) {
$sort[$field] = [ 'order' => $order ];
}
$chain = true;
}
}
private function sort_field( $field ) {
return strpos( $field, 'txt' ) !== false || strpos( $field, 'wpgField' ) !== false || strpos( $field, 'uriField' ) !== false;
}
}
|
