mirror of https://github.com/friendica/friendica
119 lines
3.0 KiB
PHP
119 lines
3.0 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica;
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/**
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* The Collection classes inheriting from this abstract class are meant to represent a list of database record.
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* The associated model class has to be provided in the child classes.
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*
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* Collections can be used with foreach(), accessed like an array and counted.
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*/
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abstract class BaseCollection extends \ArrayIterator
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{
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/**
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* This property is used with paginated results to hold the total number of items satisfying the paginated request.
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* @var int
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*/
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protected $totalCount = 0;
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/**
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* @param BaseEntity[] $entities
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* @param int|null $totalCount
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*/
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public function __construct(array $entities = [], int $totalCount = null)
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{
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parent::__construct($entities);
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$this->totalCount = $totalCount ?? count($entities);
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}
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/**
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* @inheritDoc
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*/
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public function offsetSet($offset, $value)
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{
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if (is_null($offset)) {
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$this->totalCount++;
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}
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parent::offsetSet($offset, $value);
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}
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/**
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* @inheritDoc
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*/
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public function offsetUnset($offset)
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{
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if ($this->offsetExists($offset)) {
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$this->totalCount--;
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}
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parent::offsetUnset($offset);
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}
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/**
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* @return int
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*/
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public function getTotalCount()
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{
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return $this->totalCount;
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}
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/**
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* Return the values from a single field in the collection
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*
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* @param string $column
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* @param int|null $index_key
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* @return array
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* @see array_column()
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*/
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public function column($column, $index_key = null)
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{
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return array_column($this->getArrayCopy(), $column, $index_key);
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}
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/**
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* Apply a callback function on all elements in the collection and returns a new collection with the updated elements
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*
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* @param callable $callback
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* @return BaseCollection
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* @see array_map()
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*/
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public function map(callable $callback)
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{
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return new static(array_map($callback, $this->getArrayCopy()), $this->getTotalCount());
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}
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/**
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* Filters the collection based on a callback that returns a boolean whether the current item should be kept.
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*
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* @param callable|null $callback
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* @param int $flag
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* @return BaseCollection
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* @see array_filter()
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*/
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public function filter(callable $callback = null, int $flag = 0)
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{
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return new static(array_filter($this->getArrayCopy(), $callback, $flag));
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}
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}
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