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<?php |
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namespace Maphper\Relation; |
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class ManyMany implements \IteratorAggregate, \ArrayAccess, \Countable, \Maphper\Relation { |
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private $results; |
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private $localField; |
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private $parentField; |
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private $iterator = 0; |
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private $otherInfo; |
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private $relatedMapper; |
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private $intermediateMapper; |
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private $autoTraverse = false; |
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private $object; |
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private $intermediateName; |
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public function __construct(\Maphper\Maphper $intermediateMapper, \Maphper\Maphper $relatedMapper, $localField, $parentField, $intermediateName = null) { |
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$this->intermediateMapper = $intermediateMapper; |
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$this->relatedMapper = $relatedMapper; |
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$this->localField = $localField; |
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$this->parentField = $parentField; |
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$this->autoTraverse = $intermediateName ? false : true; |
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$this->intermediateName = $intermediateName ?: 'rel_' . $parentField; |
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$this->intermediateMapper->addRelation($this->intermediateName, new One($this->relatedMapper, $parentField, $localField)); |
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} |
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public function getData($parentObject) { |
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$this->object = $parentObject; |
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return clone $this; |
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} |
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public function overwrite($parentObject, &$data) { |
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list($relatedField, $valueField, $mapper) = $this->getOtherFieldNameInfo(); |
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$this->results = $data; |
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$this->object = $parentObject; |
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if (empty($parentObject->{$relatedField})) return; |
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foreach ($data as $dt) $this[] = $dt; |
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} |
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//bit hacky, breaking encapsulation, but simplest way to work out the info for the other side of the many:many relationship. |
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private function getOtherFieldNameInfo() { |
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if ($this->otherInfo == null) { |
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$propertyReader = function($name) {return $this->$name; }; |
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$reader = $propertyReader->bindTo($this->intermediateMapper, $this->intermediateMapper); |
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foreach ($reader('relations') as $relation) { |
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$propertyReader = $propertyReader->bindTo($relation, $relation); |
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if ($propertyReader('parentField') != $this->parentField) { |
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$relation = $relation->getData($this->object); |
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$this->otherInfo = [$propertyReader('localField'), $propertyReader('parentField'), $propertyReader('mapper')]; |
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} |
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} |
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} |
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return $this->otherInfo; |
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} |
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public function count() { |
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return count($this->getResults()); |
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} |
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private function getResults() { |
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list ($relatedField, $valueField, $relatedMapper) = $this->getOtherFieldNameInfo(); |
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$x = $this->intermediateMapper->filter([$valueField => $this->object->$relatedField]); |
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return $x; |
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} |
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public function getIterator() { |
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$results = $this->getResults()->getIterator(); |
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return new ManyManyIterator($results, $this->autoTraverse ? $this->intermediateName : null); |
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} |
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public function item($i) { |
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return iterator_to_array($this->getIterator(), false)[$i]; |
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} |
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public function offsetExists($name) { |
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$items = $this->getResults()->filter([$this->parentField => $name]); |
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return $items->getIterator()->valid(); |
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} |
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public function offsetGet($name) { |
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$items = $this->getResults()->filter([$this->parentField => $name]); |
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return $items->getIterator()->current()->{$this->intermediateName}; |
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} |
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public function offsetSet($name, $value) { |
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list($relatedField, $valueField, $mapper) = $this->getOtherFieldNameInfo(); |
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if ($this->autoTraverse) $this->offsetSetAutotraverse($value, $relatedField, $valueField); |
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else if ($this->doUpdateInterMapper($value, $relatedField, $valueField)) { |
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$record = $value; |
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$record->{$this->parentField} = $value->{$this->intermediateName}->{$this->localField}; |
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$record->$valueField = $this->object->{$relatedField}; |
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$this->intermediateMapper[] = $record; |
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} |
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} |
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private function doUpdateInterMapper($record, $relatedField, $valueField) { |
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return !(isset($record->{$this->parentField}) && isset($record->{$this->intermediateName}) && |
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isset($record->$valueField) && isset($this->object->{$relatedField}) && |
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$record->{$this->parentField} == $record->{$this->intermediateName}->{$this->localField} && |
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$record->$valueField == $this->object->{$relatedField}); |
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} |
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private function offsetSetAutotraverse($value, $relatedField, $valueField) { |
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$record = new \stdClass; |
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$record->{$this->parentField} = $value->{$this->localField}; |
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$record->$valueField = $this->object->{$relatedField}; |
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$this->intermediateMapper[] = $record; |
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} |
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public function offsetUnset($id) { |
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//$this->relation->mapper->filter([$relatedField => $this->object->$valueField, $this->relation->parentField => $id])->delete(); |
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} |
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public function delete() { |
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$this->getResults()->delete(); |
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} |
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} |
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Level-2 /
Maphper
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