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<?php |
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declare(strict_types=1); |
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namespace Stratadox\TableLoader; |
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use function array_unshift; |
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use function assert; |
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use function count; |
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use Countable; |
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use Stratadox\HydrationMapper\InvalidMapperConfiguration; |
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use Stratadox\Hydrator\ArrayHydrator; |
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use Stratadox\Hydrator\Hydrates; |
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use Stratadox\Hydrator\OneOfTheseHydrators; |
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use Stratadox\Hydrator\VariadicConstructor; |
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use Stratadox\Instantiator\CannotInstantiateThis; |
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final class Decide implements DefinesMultipleClassMapping |
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{ |
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private $label; |
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private $ownId = []; |
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private $identityColumnsFor; |
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private $decisionKey; |
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/** @var LoadsWhenTriggered[] */ |
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private $choices = []; |
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/** @var MakesConnections[] */ |
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private $relation = []; |
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private function __construct(string $label) |
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{ |
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$this->label = $label; |
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$this->ownId = ['id']; |
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$this->identityColumnsFor[$label] = [$label . '_type', $label . '_id']; |
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} |
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public static function which(string $label): DefinesMultipleClassMapping |
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{ |
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return new self($label); |
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} |
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/** @inheritdoc */ |
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public function basedOn( |
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string $key, |
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LoadsWhenTriggered ...$choices |
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): DefinesMultipleClassMapping { |
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$new = clone $this; |
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$new->decisionKey = $key; |
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$new->choices = $choices; |
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return $new; |
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} |
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/** @inheritdoc */ |
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public function by(string ...$columns): DefinesMultipleClassMapping |
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{ |
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$label = $this->label; |
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$new = clone $this; |
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$new->ownId = $columns; |
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array_unshift($columns, $this->decisionKey); |
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$new->identityColumnsFor[$label] = $this->mapThe($columns, $label . '_'); |
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return $new; |
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} |
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/** @inheritdoc */ |
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public function havingOne( |
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string $property, |
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string $label |
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): DefinesObjectMapping { |
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$new = clone $this; |
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$new->relation[$label] = HasOne::in($property); |
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return $new; |
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} |
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/** @inheritdoc */ |
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public function havingMany( |
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string $property, |
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string $label, |
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string $collectionClass = null |
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): DefinesObjectMapping { |
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$hydrator = $collectionClass ? |
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VariadicConstructor::forThe($collectionClass) : |
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ArrayHydrator::create(); |
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$new = clone $this; |
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$new->relation[$label] = HasMany::in($property, $hydrator); |
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return $new; |
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} |
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/** @inheritdoc */ |
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public function with(array $properties): DefinesMultipleClassMapping |
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{ |
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$new = clone $this; |
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foreach ($this->choices as $i => $choice) { |
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$new->choices[$i] = $choice->with($properties); |
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} |
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return $new; |
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} |
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/** @inheritdoc */ |
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public function identifying( |
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string $label, |
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string ...$columns |
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): DefinesObjectMapping { |
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$new = clone $this; |
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$new->identityColumnsFor[$label] = $columns; |
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return $new; |
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} |
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/** @inheritdoc */ |
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public function label(): string |
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{ |
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return $this->label; |
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} |
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/** @inheritdoc */ |
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public function identityColumns(): array |
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{ |
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return $this->identityColumnsFor[$this->label]; |
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} |
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/** @inheritdoc */ |
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public function objects(): MakesObjects |
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{ |
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assert(isset($this->decisionKey)); |
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return Objects::producedByThis( |
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$this->hydrator(), |
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Prefixed::with($this->label), |
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Identified::by(...$this->ownId)->andForLoading($this->decisionKey) |
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); |
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} |
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/** @inheritdoc */ |
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public function wiring(): WiresObjects |
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{ |
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// @todo extract methods |
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$ownLabel = $this->label; |
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$ownId = $this->identityColumnsFor[$ownLabel]; |
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$wires = []; |
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foreach ($this->relation as $otherLabel => $connectThem) { |
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//@todo $this->mustKnowTheIdentityColumnsFor($otherLabel); |
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$otherId = $this->identityColumnsFor[$otherLabel]; |
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$wires[] = Wire::it( |
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From::the($ownLabel, Identified::by(...$ownId)), |
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To::the($otherLabel, Identified::by(...$otherId)), |
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$connectThem |
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); |
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} |
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/** @var LoadsWhenTriggered[] $choices */ |
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$choices = []; |
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foreach ($this->choices as $choice) { |
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foreach ($this->identityColumnsFor as $label => $columns) { |
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$choice = $choice->identifying($label, ...$columns); |
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} |
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$choices[] = $choice->labeled($this->label); |
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} |
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foreach ($choices as $choice) { |
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$wiring = $choice->wiring(); |
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if ($wiring instanceof Countable && count($wiring) === 0) { |
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continue; |
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} |
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$wires[] = $wiring; |
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} |
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if (count($wires) === 1) { |
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return $wires[0]; |
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} |
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return Wired::together(...$wires); |
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} |
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/** |
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* @return Hydrates |
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* @throws InvalidMapperConfiguration |
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* @throws CannotInstantiateThis |
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*/ |
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private function hydrator(): Hydrates |
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{ |
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$choices = []; |
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foreach ($this->choices as $choice) { |
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$choices[$choice->decisionTrigger()] = $choice->hydrator(); |
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} |
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return OneOfTheseHydrators::decideBasedOnThe( |
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$this->decisionKey, |
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$choices |
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); |
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} |
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/** |
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* Prepends the identifying columns with a label. |
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* |
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* @param array $columns |
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* @return array |
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*/ |
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private function mapThe(array $columns, string $prefix): array |
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{ |
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return array_map(function(string $column) use ($prefix): string { |
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return $prefix . $column; |
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}, $columns); |
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} |
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} |
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