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<?php
/**
* Cross Language Translation Search.
* @since 2015.08
*/
class CrossLanguageTranslationSearchQuery {
/** @var TTMServer */
protected $server;
/** @var array */
protected $params;
/** @var ResultSet */
protected $resultset;
/** @var int */
protected $total = 0;
protected $hl = [ '', '' ];
public function __construct( array $params, SearchableTTMServer $server ) {
$this->params = $params;
$this->server = $server;
}
public function getDocuments() {
$documents = [];
$offset = $this->params['offset'];
$limit = $this->params['limit'];
$options = $this->params;
$options['language'] = $this->params['sourcelanguage'];
// Use a bigger limit that what was requested, since we are likely to throw away many
// results in the local filtering step at extractMessages
$options['limit'] = $limit * 10;
// TODO: the real offset should be communicated to the frontend. It currently assumes
// next offset is current offset + limit and previous one is current offset - limit.
// It might be difficult to fix scrolling results backwards. For now we handle offset
// locally.
$options['offset'] = 0;
$search = $this->server->createSearch( $this->params['query'], $options, $this->hl );
$scroll = $search->scroll( '5s' );
// Used for aggregations. Only the first scroll response has them.
$this->resultset = null;
foreach ( $scroll as $resultSet ) {
if ( !$this->resultset ) {
$this->resultset = $resultSet;
$this->total = $resultSet->getTotalHits();
}
$results = $this->extractMessages( $resultSet->getDocuments() );
$documents = array_merge( $documents, $results );
$count = count( $documents );
if ( $count >= $offset + $limit ) {
break;
}
}
// clear was introduced in Elastica 5.3.1, but Elastica extension uses 5.3.0
if ( is_callable( [ $scroll, 'clear' ] ) ) {
$scroll->clear();
}
$documents = array_slice( $documents, $offset, $limit );
return $documents;
}
/**
* Extract messages from the documents and build message definitions.
* Create a message collection from the definitions in the target language.
* Filter the message collection to get filtered messages.
* Slice messages according to limit and offset given.
* @param \Elastica\Document[] $documents
* @return array[]
*/
protected function extractMessages( $documents ) {
$messages = $ret = [];
$language = $this->params['language'];
foreach ( $documents as $document ) {
$data = $document->getData();
if ( !$this->server->isLocalSuggestion( $data ) ) {
continue;
}
$title = Title::newFromText( $data['localid'] );
if ( !$title ) {
continue;
}
$handle = new MessageHandle( $title );
if ( !$handle->isValid() ) {
continue;
}
$key = $title->getNamespace() . ':' . $title->getDBkey();
$messages[$key] = $data['content'];
}
$definitions = new MessageDefinitions( $messages );
$collection = MessageCollection::newFromDefinitions( $definitions, $language );
$filter = $this->params['filter'];
if ( $filter === 'untranslated' ) {
$collection->filter( 'hastranslation', true );
} elseif ( in_array( $filter, $this->getAvailableFilters() ) ) {
$collection->filter( $filter, false );
}
if ( $filter === 'translated' || $filter === 'fuzzy' ) {
$collection->loadTranslations();
}
foreach ( $collection->keys() as $mkey => $title ) {
$result = [];
$result['content'] = $messages[$mkey];
if ( $filter === 'translated' || $filter === 'fuzzy' ) {
$result['content'] = $collection[$mkey]->translation();
}
$handle = new MessageHandle( $title );
$result['localid'] = $handle->getTitleForBase()->getPrefixedText();
$result['language'] = $language;
$ret[] = $result;
}
return $ret;
}
/**
* @return array
*/
public function getAvailableFilters() {
return [
'translated',
'fuzzy',
'untranslated'
];
}
public function getTotalHits() {
return $this->total;
}
public function getResultSet() {
return $this->resultset;
}
}
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