Retrieving Canonical tag on page with selenium

Retrieving Canonical tag on page with selenium :-

HTML Source :- 

<link rel="canonical" href="base url" />

int result =0;

String url = selenium.getLocation();

if (selenium.isElementPresent("//link[@rel='canonical' and @href='" + (url) + "']"))

{

//System.out.println(url+"Canonical tag present : " + selenium.getText("//link[@rel='canonical']"));

System.out.println("Canonical tag present : " + url);

selenium.open(url);

}

else 

{

System.out.println("Canonical tag not present : " +url);

result++;

}