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<?php |
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namespace Helix\DB; |
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use Helix\DB; |
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use ReflectionClass; |
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/** |
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* Represents a junction table, derived from an annotated interface. |
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* |
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* Interface Annotations: |
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* |
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* - `@junction <TABLE>` |
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* - `@foreign <COLUMN> <CLASS FQN>` or `@for <COLUMN> <CLASS FQN>` |
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* |
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* @method static static factory(DB $db, string $table, array $classes) |
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* |
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* @TODO Remove the `for` tag, it's vague. |
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*/ |
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class Junction extends Table { |
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protected const RX_JUNCTION = '/\*\h*@junction\h+(?<table>\w+)/i'; |
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protected const RX_FOREIGN = '/\*\h*@for(eign)?\h+(?<column>\w+)\h+(?<class>\S+)/i'; |
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/** |
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* `[column => class]` |
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* |
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* @var string[] |
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*/ |
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protected $classes = []; |
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/** |
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* @param DB $db |
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* @param string $interface |
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* @return Junction |
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*/ |
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public static function fromInterface (DB $db, string $interface) { |
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$ref = new ReflectionClass($interface); |
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assert($ref->isInterface()); |
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$doc = $ref->getDocComment(); |
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preg_match(static::RX_JUNCTION, $doc, $junction); |
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preg_match_all(static::RX_FOREIGN, $doc, $foreign, PREG_SET_ORDER); |
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$classes = array_column($foreign, 'class', 'column'); |
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return static::factory($db, $junction['table'], $classes); |
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} |
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/** |
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* @param DB $db |
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* @param string $table |
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* @param string[] $classes |
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*/ |
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public function __construct (DB $db, string $table, array $classes) { |
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parent::__construct($db, $table, array_keys($classes)); |
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$this->classes = $classes; |
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} |
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/** |
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* Returns a {@link Select} for entities referenced by a foreign key. |
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* |
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* The {@link Select} is literal and can be iterated directly. |
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* |
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* @param string $key The column referencing the class to collect. |
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* @param array $match Keyed by junction column. |
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* @return Select|EntityInterface[] |
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*/ |
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public function findAll (string $key, array $match = []) { |
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$record = $this->getRecord($key); |
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$select = $record->loadAll(); |
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$select->join($this, $this[$key]->isEqual($record['id'])); |
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foreach ($match as $a => $b) { |
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$select->where($this->db->match($this[$a], $b)); |
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} |
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return $select; |
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} |
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/** |
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* @param string $column |
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* @return string |
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*/ |
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final public function getClass (string $column): string { |
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return $this->classes[$column]; |
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} |
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/** |
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* @return string[] |
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*/ |
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final public function getClasses () { |
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return $this->classes; |
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} |
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/** |
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* @param string $column |
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* @return Record |
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*/ |
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public function getRecord (string $column) { |
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return $this->db->getRecord($this->classes[$column]); |
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} |
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/** |
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* @return Record[] |
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*/ |
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public function getRecords () { |
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return array_map(fn($class) => $this->db->getRecord($class), $this->classes); |
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} |
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/** |
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* `INSERT IGNORE` to link entities. |
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* |
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* @param int[] $ids Keyed by column. |
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* @return int Rows affected. |
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*/ |
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public function link (array $ids): int { |
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$statement = $this->cache(__FUNCTION__, function() { |
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$columns = implode(',', array_keys($this->columns)); |
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$slots = implode(',', $this->db->slots(array_keys($this->columns))); |
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if ($this->db->isSQLite()) { |
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$sql = "INSERT OR IGNORE INTO {$this} ({$columns}) VALUES ({$slots})"; |
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} |
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else { |
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$sql = "INSERT IGNORE INTO {$this} ({$columns}) VALUES ({$slots})"; |
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} |
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return $this->db->prepare($sql); |
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}); |
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$affected = $statement($ids)->rowCount(); |
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$statement->closeCursor(); |
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return $affected; |
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} |
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/** |
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* Alias for {@link delete()} |
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* |
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* @param array $ids Keyed by Column |
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* @return int Rows affected |
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*/ |
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public function unlink (array $ids): int { |
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return $this->delete($ids); |
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} |
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} |
hfw /
db
