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AbstractFilterer.php
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AbstractFilterer.php
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<?php
/*
* This file is part of Flarum.
*
* For detailed copyright and license information, please view the
* LICENSE file that was distributed with this source code.
*/
namespace Flarum\Filter;
use Flarum\Query\ApplyQueryParametersTrait;
use Flarum\Query\QueryCriteria;
use Flarum\Query\QueryResults;
use Flarum\User\User;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Arr;
use InvalidArgumentException;
abstract class AbstractFilterer
{
use ApplyQueryParametersTrait;
protected $filters;
protected $filterMutators;
/**
* @param array $filters
* @param array $filterMutators
*/
public function __construct(array $filters, array $filterMutators)
{
$this->filters = $filters;
$this->filterMutators = $filterMutators;
}
abstract protected function getQuery(User $actor): Builder;
/**
* @param QueryCriteria $criteria
* @param mixed|null $limit
* @param int $offset
*
* @return QueryResults
* @throws InvalidArgumentException
*/
public function filter(QueryCriteria $criteria, int $limit = null, int $offset = 0): QueryResults
{
$actor = $criteria->actor;
$query = $this->getQuery($actor);
$filterState = new FilterState($query->getQuery(), $actor);
foreach ($criteria->query as $filterKey => $filterValue) {
$negate = false;
if (substr($filterKey, 0, 1) == '-') {
$negate = true;
$filterKey = substr($filterKey, 1);
}
foreach (Arr::get($this->filters, $filterKey, []) as $filter) {
$filterState->addActiveFilter($filter);
$filter->filter($filterState, $filterValue, $negate);
}
}
$this->applySort($filterState, $criteria->sort, $criteria->sortIsDefault);
$this->applyOffset($filterState, $offset);
$this->applyLimit($filterState, $limit + 1);
foreach ($this->filterMutators as $mutator) {
$mutator($filterState, $criteria);
}
// Execute the filter query and retrieve the results. We get one more
// results than the user asked for, so that we can say if there are more
// results. If there are, we will get rid of that extra result.
$results = $query->get();
if ($areMoreResults = $limit > 0 && $results->count() > $limit) {
$results->pop();
}
return new QueryResults($results, $areMoreResults);
}
}