<?php
// {{{ICINGA_LICENSE_HEADER}}}
// {{{ICINGA_LICENSE_HEADER}}}

namespace Icinga\Protocol\Statusdat;

/**
 * Container class containing the runtime state of an object
 *
 * This class contains the state of the object as a string and parses it
 * on the fly as soon as values should be retrieved. This reduces memory usage,
 * as most runtime information is never received and only lives for a very short time.
 *
 */
class RuntimeStateContainer extends \stdClass
{
    /**
     * The state string
     *
     * @var string
     */
    public $runtimeState = "";

    /**
     * Create a new runtime state container from the givven string
     *
     * @param string $str
     */
    public function __construct($str = "")
    {
        $this->runtimeState = $str;
    }

    /**
     * Return true if the argument exists
     *
     * @param  String $attr The argument to retrieve
     * @return bool         True if it exists, otherwise false
     */
    public function __isset($attr)
    {
        try {
            $this->__get($attr);
            return true;
        } catch (\InvalidArgumentException $e) {
            return false;
        }
    }

    /**
     * Return the given attribute
     *
     * If the container string is not yet parsed, this will happen here
     *
     * @param  String $attr                 The attribute to retrieve
     * @return mixed                        The value of the attribute
     * @throws \InvalidArgumentException    When the attribute does not exist
     */
    public function __get($attr)
    {
        $start = strpos($this->runtimeState, $attr . "=");
        if ($start === false) {
            throw new \InvalidArgumentException("Unknown property $attr");
        }

        $start += strlen($attr . "=");
        $len = strpos($this->runtimeState, "\n", $start) - $start;
        $this->$attr = trim(substr($this->runtimeState, $start, $len));

        return $this->$attr;
    }
}