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	joshuaspence
	Jul 18 2019, 10:33 PM

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	<?php

	final class ConduitIterator implements Iterator {

	private $client;
	private $method;
	private $parameters;

	private $current;
	private $cursor;

	public function __construct(ConduitClient $client, string $method, array $parameters) {
	$this->client = $client;
	$this->method = $method;
	$this->parameters = $parameters;
	}

	private function execute(): void {
	$parameters = $this->parameters;

	if ($this->cursor !== null) {
	$parameters['after'] = $this->cursor['after'];
	}

	$response = $this->client->callMethodSynchronous($this->method, $parameters);

	$this->current = new ArrayIterator($response['data']);
	$this->cursor = $response['cursor'];
	}

	private function getResults(): ArrayIterator {
	if ($this->current === null) {
	$this->execute();
	}

	return $this->current;
	}


	/* -( Iterator )----------------------------------------------------------- */


	public function current() {
	return $this->getResults()->current();
	}

	public function key() {
	return $this->getResults()->key();
	}

	public function next(): void {
	$this->getResults()->next();
	}

	public function rewind(): void {
	$this->current = null;
	$this->cursor = null;
	}

	public function valid(): bool {
	$valid = $this->getResults()->valid();

	if (!$valid) {
	if ($this->cursor['after'] === null) {
	return false;
	}

	$this->execute();
	return true;
	}

	return $valid;
	}

	}