Read Sign Data when it is created

I am using the onBlockPlace event with some code like this to see if it is a sign being placed.

Code:

if (block.getState() instanceof Sign) {
    //block is a sign
} else {
    //block is not a sign
}

The problem is, the function onBlockPlace is called when the player places the sign not when the click the done button after adding the text. How can I read the text of any new sign?

Thanks, giodamelio

After a closer look at the bukkit javadocs, I noticed the SingChangedEvent. That was exactly what I needed

EDIT by Moderator: merged posts, please use the edit button instead of double posting.