class PerformanceTimingData

class PerformanceTimingData {
    
    /**
     * @var array
     */
    private $data;
    
    /**
     * @param array $data
     */
    public function __construct($data) {
        $this->data = $data;
    }
    
    /**
     * @return int
     */
    public function getDNSTiming() {
        if (isset($this->data['domainLookupEnd']) && isset($this->data['domainLookupStart'])) {
            return $this->data['domainLookupEnd'] - $this->data['domainLookupStart'];
        }
        else {
            return 0;
        }
    }
    
    /**
     * @return int
     */
    public function getTCPTiming() {
        if (isset($this->data['connectEnd']) && isset($this->data['connectStart'])) {
            return $this->data['connectEnd'] - $this->data['connectStart'];
        }
        else {
            return 0;
        }
    }
    
    /**
     * @return int
     */
    public function getTtfbTiming() {
        if (isset($this->data['responseStart']) && isset($this->data['connectEnd'])) {
            return $this->data['responseStart'] - $this->data['connectEnd'];
        }
        else {
            return 0;
        }
    }
    
    /**
     * @return int
     */
    public function getDataTiming() {
        if (isset($this->data['responseEnd']) && isset($this->data['responseStart'])) {
            return $this->data['responseEnd'] - $this->data['responseStart'];
        }
        else {
            return 0;
        }
    }
    
    /**
     * @return int
     */
    public function getDomTiming() {
        if (isset($this->data['loadEventStart']) && isset($this->data['responseEnd'])) {
            return $this->data['loadEventStart'] - $this->data['responseEnd'];
        }
        else {
            return 0;
        }
    }

}