<?php

namespace Badcow\DNS\Rdata;

/**
 * @see https://tools.ietf.org/html/rfc1035#section-3.3.1
 */
class CNAME implements RdataInterface
{
	use RdataTrait;

	const TYPE = 'CNAME';
	const TYPE_CODE = 5;

	/** @var string|null */
	protected $target;


	/**
	 * @param string $target
	 */
	public function setTarget(string $target): void
	{
		$this->target = $target;
	}


	/**
	 * @return string
	 */
	public function getTarget(): ?string
	{
		return $this->target;
	}


	/**
	 * {@inheritdoc}
	 */
	public function toText(): string
	{
		return $this->target ?? '';
	}


	/**
	 * {@inheritdoc}
	 */
	public function toWire(): string
	{
		if (null === $this->target) {
		    throw new \InvalidArgumentException('Target must be set.');
		}

		return self::encodeName($this->target);
	}


	/**
	 * {@inheritdoc}
	 */
	public static function fromText(string $text): RdataInterface
	{
		$cname = new static();
		$cname->setTarget($text);

		return $cname;
	}


	/**
	 * {@inheritdoc}
	 */
	public static function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): RdataInterface
	{
		$cname = new static();
		$cname->setTarget(self::decodeName($rdata, $offset));

		return $cname;
	}
}
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