Keywords.php

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<?php

namespace SAML2\XML\mdui;

class Keywords
{
    public $Keywords;

    public $lang;

    public function __construct(\DOMElement $xml = null)
    {
        if ($xml === null) {
            return;
        }

        if (!$xml->hasAttribute('xml:lang')) {
            throw new \Exception('Missing lang on Keywords.');
        }
        if (!is_string($xml->textContent) || !strlen($xml->textContent)) {
            throw new \Exception('Missing value for Keywords.');
        }
        $this->Keywords = array();
        foreach (explode(' ', $xml->textContent) as $keyword) {
            $this->Keywords[] = str_replace('+', ' ', $keyword);
        }
        $this->lang = $xml->getAttribute('xml:lang');
    }

    public function toXML(\DOMElement $parent)
    {
        assert(is_string($this->lang));
        assert(is_array($this->Keywords));

        $doc = $parent->ownerDocument;

        $e = $doc->createElementNS(Common::NS, 'mdui:Keywords');
        $e->setAttribute('xml:lang', $this->lang);
        $value = '';
        foreach ($this->Keywords as $keyword) {
            if (strpos($keyword, "+") !== false) {
                throw new \Exception('Keywords may not contain a "+" character.');
            }
            $value .= str_replace(' ', '+', $keyword) . ' ';
        }
        $value = rtrim($value);
        $e->appendChild($doc->createTextNode($value));
        $parent->appendChild($e);

        return $e;
    }
}