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<?php |
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namespace Helix\DB; |
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use Helix\DB; |
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use Helix\DB\SQL\Predicate; |
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use LogicException; |
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use ReflectionClass; |
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use ReflectionException; |
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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 CLASS COLUMN` or `@for CLASS COLUMN` |
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*/ |
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class Junction extends Table { |
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/** |
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* `[class => column name]` |
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*/ |
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protected $keys = []; |
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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 $interface) { |
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try { |
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$ref = new ReflectionClass($interface); |
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} |
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catch (ReflectionException $exception) { |
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throw new LogicException('Unexpected ReflectionException', 0, $exception); |
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} |
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$doc = $ref->getDocComment(); |
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$keys = []; |
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foreach (explode("\n", $doc) as $line) { |
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if (preg_match('/@for(eign)?\s+(?<class>\S+)\s+(?<column>\S+)/', $line, $foreign)) { |
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$keys[$foreign['class']] = $foreign['column']; |
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} |
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} |
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preg_match('/@junction\s+(?<table>\S+)/', $doc, $junction); |
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return new static($db, $junction['table'], $keys); |
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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[] $keys Columns, keyed by class. |
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*/ |
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public function __construct (DB $db, string $table, array $keys) { |
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parent::__construct($db, $table, $keys); |
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$this->keys = $keys; |
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} |
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/** |
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* Returns the number of references to an entity in the junction. |
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* |
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* @param EntityInterface $entity |
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* @return int |
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*/ |
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public function count (EntityInterface $entity): int { |
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$key = $this->getKey($entity); |
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$count = $this->cache("count.{$key}", function() use ($key) { |
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return $this->select(['COUNT(*)'])->where("{$key} = ?")->prepare(); |
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}); |
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return $count([$entity->getId()])->fetchColumn(); |
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} |
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/** |
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* Returns a {@link Select} for entities in a has-many relationship. |
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* |
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* The `Select` is literal and can be iterated directly. |
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* |
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* @param EntityInterface $owner |
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* @param string $class |
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* @return Select |
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*/ |
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public function getCollection (EntityInterface $owner, string $class): Select { |
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$record = $this->db->getRecord($class); |
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$select = $record->select(); |
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$select->join($this, $this[$class]->isEqual($record['id'])); |
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$select->where($this[get_class($owner)]->isEqual($owner->getId())); |
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return $select; |
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} |
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/** |
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* Returns the foreign key column name specified in `@foreign CLASS COLUMN`. |
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* |
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* @param EntityInterface|string $class |
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* @return string |
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*/ |
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public function getKey ($class): string { |
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if (is_object($class)) { |
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$class = get_class($class); |
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} |
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return $this->keys[$class]; |
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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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* One entity for each column must be given. |
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* |
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* The given array doesn't need to be keyed in any special way, |
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* the columns are looked up based on class. |
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* |
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* @param EntityInterface[] $entities |
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* @return int Rows affected. |
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*/ |
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public function link (array $entities): int { |
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$link = $this->cache(__FUNCTION__, function() { |
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$slots = implode(',', SQL::slots($this->keys)); |
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$columns = implode(',', $this->keys); |
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if ($this->db->getDriver() === 'sqlite') { |
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return $this->db->prepare("INSERT OR IGNORE INTO {$this} ({$columns}) VALUES ({$slots})"); |
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} |
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return $this->db->prepare("INSERT IGNORE INTO {$this} ({$columns}) VALUES ({$slots})"); |
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}); |
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$ids = array_fill_keys($this->keys, null); |
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foreach ($entities as $entity) { |
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$ids[$this->getKey($entity)] = $entity->getId(); |
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} |
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return $link($ids)->rowCount(); |
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} |
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/** |
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* Allows lookup by class name. |
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* |
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* @param string $name |
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* @return bool |
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*/ |
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public function offsetExists ($name): bool { |
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return isset($this->columns[$name]) or isset($this->keys[$name]); |
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} |
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/** |
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* Allows lookup by class name. |
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* |
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* @param string $name |
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* @return Column |
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*/ |
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public function offsetGet ($name): Column { |
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return $this->columns[$name] ?? $this->columns[$this->keys[$name]]; |
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} |
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/** |
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* Removes rows that contain all of the given entities. |
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* |
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* The given array doesn't need to be keyed in any special way, |
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* the columns are looked up based on class. |
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* |
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* @param EntityInterface[] $entities |
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* @return int Rows affected. |
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*/ |
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public function unlink (array $entities): int { |
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$unlink = $this->cache(__FUNCTION__, function() { |
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$slots = Predicate::all(SQL::slotsEqual($this->keys)); |
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return $this->db->prepare("DELETE FROM {$this} WHERE {$slots}"); |
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}); |
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$ids = array_fill_keys($this->keys, null); |
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foreach ($entities as $entity) { |
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$ids[$this->getKey($entity)] = $entity->getId(); |
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} |
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return $unlink($ids)->rowCount(); |
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} |
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} |
hfw /
db
