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<?php |
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namespace phootwork\collection; |
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use \Iterator; |
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use \InvalidArgumentException; |
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/** |
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* CollectionUtils help to transform data recursively into collections. |
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* |
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* It must be mentioned the API is experimental and may change. Please |
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* report to the issue tracker. |
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*/ |
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class CollectionUtils { |
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/** |
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* Returns a proper collection for the given array (also transforms nested collections) |
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* (experimental API) |
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* |
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* @param array|Iterator $collection |
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* @return Map|ArrayList the collection |
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* @throws InvalidArgumentException |
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*/ |
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public static function fromCollection($collection) { |
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if (!(is_array($collection) || $collection instanceof Iterator)) { |
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throw new InvalidArgumentException('$collection is neither an array nor an iterator'); |
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} |
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return self::toCollection($collection); |
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} |
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private static function toCollection($data) { |
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// prepare normal array |
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if (!($data instanceof Iterator)) { |
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$data = json_decode(json_encode($data)); |
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} |
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// check if we can transform it into a collection or just return as is |
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if (!(is_array($data) || $data instanceof Iterator || $data instanceof \stdClass)) { |
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return $data; |
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} |
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// check we have a list |
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if (is_array($data) || $data instanceof AbstractList) { |
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return self::toList($data); |
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} |
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// everything else must be a map |
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return self::toMap($data); |
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} |
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/** |
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* Recursively transforms data into a map (on the first level, deeper levels |
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* transformed to an appropriate collection) (experimental API) |
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* |
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* @param array|Iterator $collection |
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* @return Map |
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*/ |
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public static function toMap($collection) { |
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$map = new Map(); |
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foreach ($collection as $k => $v) { |
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$map->set($k, self::toCollection($v)); |
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} |
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return $map; |
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} |
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/** |
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* Recursively transforms data into a list (on the first level, deeper levels |
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* transformed to an appropriate collection) (experimental API) |
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* |
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* @param array|Iterator $collection |
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* @return ArrayList |
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*/ |
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public static function toList($collection) { |
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$list = new ArrayList(); |
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foreach ($collection as $v) { |
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$list->add(self::toCollection($v)); |
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} |
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return $list; |
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} |
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/** |
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* Recursively exports a collection to an array |
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* |
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* @param mixed $collection |
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* @return array |
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*/ |
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public static function toArrayRecursive($collection) { |
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$arr = $collection; |
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if (is_object($collection) && method_exists($collection, 'toArray')) { |
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$arr = $collection->toArray(); |
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} |
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return array_map(function ($v) { |
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if (is_object($v) && method_exists($v, 'toArray')) { |
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return static::toArrayRecursive($v); |
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} |
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return $v; |
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}, $arr); |
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} |
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} |
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phootwork /
collection
