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<?php
namespace SMW\SQLStore\QueryEngine\Fulltext;
use SMW\Query\Language\ValueDescription;
/**
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class SQLiteValueMatchConditionBuilder extends ValueMatchConditionBuilder {
/**
* @see ValueMatchConditionBuilder::canApplyFulltextSearchMatchCondition
* @since 2.5
*
* @param ValueDescription $description
*
* @return boolean
*/
public function canApplyFulltextSearchMatchCondition( ValueDescription $description ) {
if ( !$this->isEnabled() ) {
return false;
}
if ( $description->getProperty() !== null && $this->isExemptedProperty( $description->getProperty() ) ) {
return false;
}
if ( !$this->searchTable->isValidByType( $description->getDataItem()->getDiType() ) ) {
return false;
}
$matchableText = $this->getMatchableTextFromDescription(
$description
);
$comparator = $description->getComparator();
if ( $matchableText && ( $comparator === SMW_CMP_LIKE || $comparator === SMW_CMP_NLKE ) ) {
return $this->hasMinTokenLength( str_replace( '*', '', $matchableText ) );
}
return false;
}
/**
* @see ValueMatchConditionBuilder::getWhereCondition
* @since 2.5
*
* @param ValueDescription $description
* @param string $temporaryTable
*
* @return string
*/
public function getWhereCondition( ValueDescription $description, $temporaryTable = '' ) {
$matchableText = $this->getMatchableTextFromDescription(
$description
);
$value = $this->textSanitizer->sanitize(
$matchableText,
true
);
// A leading or trailing minus sign indicates that this word must not
// be present in any of the rows that are returned.
// InnoDB only supports leading minus signs.
if ( $description->getComparator() === SMW_CMP_NLKE ) {
$value = '-' . $value;
}
// Something like [[Has text::!~database]] will cause a
// "malformed MATCH expression" due to "An FTS query may not consist
// entirely of terms or term-prefix queries with unary "-" operators
// attached to them." and doing "NOT database" will result in an empty
// result set
$temporaryTable = $temporaryTable !== '' ? $temporaryTable . '.' : '';
$column = $temporaryTable . $this->searchTable->getIndexField();
$property = $description->getProperty();
$propertyCondition = '';
// Full text is collected in a single table therefore limit the match
// process by adding the PID as an additional condition
if ( $property !== null ) {
$propertyCondition = ' AND ' . $temporaryTable . 'p_id=' . $this->searchTable->addQuotes(
$this->searchTable->getIdByProperty( $property )
);
}
return $column . " MATCH " . $this->searchTable->addQuotes( $value ) . "$propertyCondition";
}
}
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