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<?php

namespace SAREhub\Client\Processor;

use SAREhub\Client\Message\Exchange;

/**
 * Appends defined headers to input message.
 */
class HeaderAppenderProcessor implements Processor
{

    private $headers = [];

    public static function newInstance()
    {
        return new self();
    }

    /**
     * @param array $headers
     * @return $this
     */
    public function withHeaders(array $headers)
    {
        $this->headers = $headers;
        return $this;
    }

    public function process(Exchange $exchange)
    {
        $in = $exchange->getIn();
        foreach ($this->getHeaders() as $header => $value) {
            $in->setHeader($header, $value);
        }
    }

    /**
     * @return array
     */
    public function getHeaders()
    {
        return $this->headers;
    }

    public function __toString()
    {
        return 'HeaderAppender[' . http_build_query($this->getHeaders(), '', ', ') . ']';
    }
}