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Viewing / Editing File: CursorCollection.php

<?php

namespace Mollie\Api\Resources;

use Generator;
use Mollie\Api\MollieApiClient;

abstract class CursorCollection extends BaseCollection
{
    /**
     * @var MollieApiClient
     */
    protected $client;

/**
     * @param MollieApiClient $client
     * @param int $count
     * @param \stdClass|null $_links
     */
    final public function __construct(MollieApiClient $client, $count, $_links)
    {
        parent::__construct($count, $_links);

$this->client = $client;
    }

/**
     * @return BaseResource
     */
    abstract protected function createResourceObject();

/**
     * Return the next set of resources when available
     *
     * @return CursorCollection|null
     * @throws \Mollie\Api\Exceptions\ApiException
     */
    final public function next()
    {
        if (! $this->hasNext()) {
            return null;
        }

$result = $this->client->performHttpCallToFullUrl(MollieApiClient::HTTP_GET, $this->_links->next->href);

$collection = new static($this->client, $result->count, $result->_links);

foreach ($result->_embedded->{$collection->getCollectionResourceName()} as $dataResult) {
            $collection[] = ResourceFactory::createFromApiResult($dataResult, $this->createResourceObject());
        }

return $collection;
    }

/**
     * Return the previous set of resources when available
     *
     * @return CursorCollection|null
     * @throws \Mollie\Api\Exceptions\ApiException
     */
    final public function previous()
    {
        if (! $this->hasPrevious()) {
            return null;
        }

$result = $this->client->performHttpCallToFullUrl(MollieApiClient::HTTP_GET, $this->_links->previous->href);

$collection = new static($this->client, $result->count, $result->_links);

return $collection;
    }

/**
     * Determine whether the collection has a next page available.
     *
     * @return bool
     */
    public function hasNext()
    {
        return isset($this->_links->next->href);
    }

/**
     * Determine whether the collection has a previous page available.
     *
     * @return bool
     */
    public function hasPrevious()
    {
        return isset($this->_links->previous->href);
    }

/**
     * Iterate over a CursorCollection and yield its elements.
     *
     * @param bool $iterateBackwards
     *
     * @return LazyCollection
     */
    public function getAutoIterator(bool $iterateBackwards = false): LazyCollection
    {
        $page = $this;

return new LazyCollection(function () use ($page, $iterateBackwards): Generator {
            while (true) {
                foreach ($page as $item) {
                    yield $item;
                }

if (($iterateBackwards && ! $page->hasPrevious()) || ! $page->hasNext()) {
                    break;
                }

$page = $iterateBackwards
                    ? $page->previous()
                    : $page->next();
            }
        });
    }
}

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