<?php

class Measurement extends mfBaseModel
{
    private $device;
    private $sensor;

    public function getProperty($name)
    {
        if ($this->$name == null) {
            if (!$this->id) {
                return null;
            }

            if($name == "device") {
                $this->device = mfValuecache::singleton()->get("Device-id-".$this->device_id);
                if($this->device === null) {
                    $this->device = new Device($this->device_id);
                    if($this->device->id) {
                        mfValuecache::singleton()->set("Device-id-".$this->device_id, $this->device);
                    }
                }
                return $this->device;
            }

            if($name == "sensor") {
                // Sensor would be a separate entity if it exists
                // For now, just return the sensor_id
                return $this->sensor_id;
            }

            $classname = ucfirst($name);
            $idfield = $name."_id";
            if(property_exists($this->data, $idfield)) {
                $this->$name = mfValuecache::singleton()->get("mfObjectmodel-$name-".$this->$idfield);
                if(!$this->$name) {
                    $this->$name = new $classname($this->$idfield);
                }

                if($this->$name->id) {
                    mfValuecache::singleton()->set("mfObjectmodel-$name-".$this->$name->id, $this->$name);
                    return $this->$name;
                } else {
                    return null;
                }
            }

            return null;
        }

        return $this->$name;
    }
}