Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica;
/**
* The Collection classes inheriting from this abstract class are meant to represent a list of database record.
* The associated model class has to be provided in the child classes.
*
* Collections can be used with foreach(), accessed like an array and counted.
*/
abstract class BaseCollection extends \ArrayIterator
{
/**
* This property is used with paginated results to hold the total number of items satisfying the paginated request.
* @var int
*/
protected $totalCount = 0;
/**
* @param BaseEntity[] $entities
* @param int|null $totalCount
*/
public function __construct(array $entities = [], int $totalCount = null)
{
parent::__construct($entities);
$this->totalCount = $totalCount ?? count($entities);
}
/**
* @inheritDoc
*/
public function offsetSet($offset, $value)
{
if (is_null($offset)) {
$this->totalCount++;
}
parent::offsetSet($offset, $value);
}
/**
* @inheritDoc
*/
public function offsetUnset($offset)
{
if ($this->offsetExists($offset)) {
$this->totalCount--;
}
parent::offsetUnset($offset);
}
/**
* @return int
*/
public function getTotalCount()
{
return $this->totalCount;
}
/**
* Return the values from a single field in the collection
*
* @param string $column
* @param int|null $index_key
* @return array
* @see array_column()
*/
public function column($column, $index_key = null)
{
return array_column($this->getArrayCopy(), $column, $index_key);
}
/**
* Apply a callback function on all elements in the collection and returns a new collection with the updated elements
*
* @param callable $callback
* @return BaseCollection
* @see array_map()
*/
public function map(callable $callback)
{
return new static(array_map($callback, $this->getArrayCopy()), $this->getTotalCount());
}
/**
* Filters the collection based on a callback that returns a boolean whether the current item should be kept.
*
* @param callable|null $callback
* @param int $flag
* @return BaseCollection
* @see array_filter()
*/
public function filter(callable $callback = null, int $flag = 0)
{
return new static(array_filter($this->getArrayCopy(), $callback, $flag));
}
}