Collection.php

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<?php
namespace Magento\Indexer\Model\Indexer;

use Magento\Framework\Indexer\IndexerInterface;

class Collection extends \Magento\Framework\Data\Collection
{
    protected $_itemObjectClass = IndexerInterface::class;

    protected $_items = [];

    protected $config;

    protected $statesFactory;

    public function __construct(
        \Magento\Framework\Data\Collection\EntityFactoryInterface $entityFactory,
        \Magento\Framework\Indexer\ConfigInterface $config,
        \Magento\Indexer\Model\ResourceModel\Indexer\State\CollectionFactory $statesFactory
    ) {
        $this->config = $config;
        $this->statesFactory = $statesFactory;
        parent::__construct($entityFactory);
    }

    public function loadData($printQuery = false, $logQuery = false)
    {
        if (!$this->isLoaded()) {
            $states = $this->statesFactory->create();
            foreach (array_keys($this->config->getIndexers()) as $indexerId) {
                $indexer = $this->getNewEmptyItem();
                $indexer->load($indexerId);
                foreach ($states->getItems() as $state) {
                    if ($state->getIndexerId() == $indexerId) {
                        $indexer->setState($state);
                        break;
                    }
                }
                $this->_addItem($indexer);
            }
            $this->_setIsLoaded(true);
        }
        return $this;
    }

    public function getAllIds()
    {
        $ids = [];
        foreach ($this->getItems() as $item) {
            $ids[] = $item->getId();
        }
        return $ids;
    }

    public function getItems()
    {
        return parent::getItems();
    }

    public function getColumnValues($colName)
    {
        return [];
    }

    public function getItemsByColumnValue($column, $value)
    {
        return [];
    }

    public function getItemByColumnValue($column, $value)
    {
        return null;
    }

    public function setDataToAll($key, $value = null)
    {
        return $this;
    }

    public function setItemObjectClass($className)
    {
        return $this;
    }

    public function toXml()
    {
        return '';
    }

    public function toArray($arrRequiredFields = [])
    {
        return [];
    }

    public function toOptionArray()
    {
        return [];
    }

    public function toOptionHash()
    {
        return [];
    }

    protected function _toOptionArray($valueField = 'id', $labelField = 'name', $additional = [])
    {
        return [];
    }

    protected function _toOptionHash($valueField = 'id', $labelField = 'name')
    {
        return [];
    }
}