<?php

class VigiloDepends extends VigiloXml

{

    protected $host;

    protected $service;

    protected $weight;

    protected $warningWeight;

    public function __construct($host = null, $service = null, $weight = 1, $warningWeight = null)

    {

        /* GLPI signale parfois l'absence de valeur via des chaînes vides,

           plutôt qu'en utilisant la constante null. */

        if ('' === $host) {

            $host = null;

        }

        if ('' === $service) {

            $service = null;

        }

        if (null === $host && null === $service) {

            throw new Exception('Invalid dependency');

        }

        if ((null !== $host && !is_string($host)) ||

            (null !== $service && !is_string($service))) {

            throw new Exception('Invalid dependency');

        }

        if (null === $service && null !== $warningWeight) {

            // L'état "warning" n'existe pas pour les hôtes.

            throw new Exception('Invalid dependency');

        }

        if (null === $warningWeight) {

            $warningWeight = $weight;

        }

        $this->host             = $host;

        $this->service          = $service;

        $this->weight           = (int) $weight;

        $this->warningWeight    = (int) $warningWeight;

    }

    public function __toString()

    {

        if (null === $this->host) {

            return  "<depends service=\"{$this->service}\" " .

                    "weight=\"{$this->weight}\" " .

                    "warning_weight=\"{$this->warningWeight}\"/>";

        }

        if (null === $this->service) {

            return "<depends host=\"{$this->host}\" weight=\"{$this->weight}\"/>";

        }

        return  "<depends host=\"{$this->host}\" " .

                "service=\"{$this->service}\" " .

                "weight=\"{$this->weight}\" " .

                "warning_weight=\"{$this->warningWeight}\"/>";

    }

}