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<?php |
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/** |
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* The simple implementation of a recursive query. |
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*/ |
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namespace Rocket\Taxonomy\Utils; |
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use Illuminate\Support\Arr; |
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use Illuminate\Support\Collection; |
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use Illuminate\Support\Facades\DB; |
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use Rocket\Taxonomy\Model\Hierarchy; |
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/** |
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* This Class handles recusive queries to retrieve |
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* parent-child relations for terms. |
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*/ |
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class RecursiveQuery implements RecursiveQueryInterface |
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{ |
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/** |
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* @var string The table in which hierarchical data is stored |
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*/ |
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protected $hierarchyTable; |
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/** |
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* This Class handles recusive queries to retrieve |
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* parent-child relations for terms. |
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*/ |
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public function __construct() |
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{ |
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$this->hierarchyTable = (new Hierarchy)->getTable(); |
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} |
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/** |
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* Get all ancestors of a term |
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* |
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* @param int $id The term ID |
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* @return \Illuminate\Support\Collection |
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*/ |
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public function getAncestry($id) |
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{ |
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$all_results = new Collection(DB::select($this->getAncestryInitialQuery(), [':id' => $id])); |
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if (count($all_results)) { |
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$this->getRecursiveAncestry($all_results, $all_results->pluck('parent_id')); |
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} |
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return $all_results; |
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} |
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/** |
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* Get the query to initiate the recursive query. |
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* |
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* @return string |
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*/ |
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protected function getAncestryInitialQuery() |
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{ |
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return "select term_id, parent_id from $this->hierarchyTable where term_id = :id"; |
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} |
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/** |
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* Get the ancestry recursively |
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* |
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* @param Collection $all_results |
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* @param int[] $ids |
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*/ |
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protected function getRecursiveAncestry(Collection $all_results, $ids) |
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{ |
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$all_results->merge($results = DB::table($this->hierarchyTable)->whereIn('term_id', $ids)->get()); |
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if (count($results)) { |
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$this->getRecursiveAncestry($all_results, Arr::pluck($results, 'parent_id')); |
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} |
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} |
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/** |
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* Get all descendants of a term. |
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* |
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* @param int $id The term ID |
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* @return \Illuminate\Support\Collection |
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*/ |
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public function getDescent($id) |
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{ |
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$all_results = new Collection(DB::select($this->getDescentInitialQuery(), [':id' => $id])); |
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if (count($all_results)) { |
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$this->getRecursiveDescent($all_results, $all_results->pluck('term_id')); |
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} |
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return $all_results; |
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} |
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/** |
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* Get the query to initiate the recursive query. |
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* |
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* @return string |
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*/ |
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protected function getDescentInitialQuery() |
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{ |
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return "select term_id, parent_id from $this->hierarchyTable where parent_id = :id"; |
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} |
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/** |
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* Get the descent recursively. |
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* |
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* @param Collection $all_results |
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* @param int[] $ids |
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*/ |
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protected function getRecursiveDescent(Collection $all_results, $ids) |
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{ |
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$all_results->merge($results = DB::table($this->hierarchyTable)->whereIn('parent_id', $ids)->get()); |
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if (count($results)) { |
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$this->getRecursiveDescent($all_results, Arr::pluck($results, 'term_id')); |
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} |
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} |
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} |
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RocketPropelledTortoise /
Core
