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<?php
/**
* This file is part of the ramsey/collection library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Collection;
/**
* This class contains the basic implementation of a collection that does not
* allow duplicated values (a set), to minimize the effort required to implement
* this specific type of collection.
*
* @template T
* @extends AbstractCollection<T>
*/
abstract class AbstractSet extends AbstractCollection
{
public function add(mixed $element): bool
{
if ($this->contains($element)) {
return false;
}
// Call offsetSet() on the parent instead of add(), since calling
// parent::add() will invoke $this->offsetSet(), which will call
// $this->contains() a second time. This can cause performance issues
// with extremely large collections. For more information, see
// https://github.com/ramsey/collection/issues/68.
parent::offsetSet(null, $element);
return true;
}
public function offsetSet(mixed $offset, mixed $value): void
{
if ($this->contains($value)) {
return;
}
parent::offsetSet($offset, $value);
}
}
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