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// new imports
import org.apache.felix.scr.annotations.Property;
 
//Attention - will use below
import static com.google.common.base.Strings.isNullOrEmpty;



// ...<snip>...

public class NullLinkProvider extends AbstractProvider implements LinkProvider {

    // ...<snip>...

    // Default values for tunable parameters
    private static final boolean FLICKER = false;
    private static final int DEFAULT_RATE = 3000;
    
    @Property(name = "flicker", boolValue = FLICKER,
            label = "Setting to flap links")
    private boolean flicker = FLICKER;

    @Property(name = "eventRate", intValue = DEFAULT_RATE,
            label = "Duration between Link Event")
    private int eventRate = DEFAULT_RATE;
	
    // ...<snip>... 

    @Modified
    public boolean modified(ComponentContext context) {
        // if there's no file, fall back to defaults
        if (context == null) {
            log.info("No configs, using defaults: flicker={}, eventRate={}",
                    FLICKER, DEFAULT_RATE);
            return false;
        }

        Dictionary<?, ?> properties = context.getProperties();
        boolean flickSetting;
        int newRate;

 
 
        // try to extract values keyed on the parameters' names
        try {
			// Attention!!! properties.get() already return the object of corresponding Class 
            Object String s = (String) properties.get("flicker");
            flickSetting = isNullOrEmpty(s) == null ? flicker : （Boolean)ss.trim().equals("true");
            s = properties.get("eventRate");
            newRate = isNullOrEmpty(s) == null ? eventRate : (Integer)sInteger.parseInt(s.trim());
        } catch (Exception e) {
            log.warn(e.getMessage());
            flickSetting = flicker;
            newRate = eventRate;
        }

        if (flicker != flickSetting) {
            flicker = flickSetting;
        }

        // launch a LinkDriver with the new values, if they were changed
        if (flicker) {
            if (eventRate != newRate) {
                eventRate = newRate;
            }
            linkDriver.submit(new LinkDriver());
            log.info("Using settings: flicker={}, eventRate={}", flicker,
                    eventRate);
            return true;
        }
        return false;
    }