Swapping block in hand for another on command

Hello, i need some help to check that the player has eg a "White wool block" in their hand and then when the use a command eg "/dye blue" it changes it to a blue wool block (removes other, gives blue). I would like to do this for every wool block and clay block and glass panes and blocks.
Thanks

Nothing?

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

 

check the item in hand when they perform the command, with gettype(), and if it's white wool, set the item in hand by a new itemstack (Material, amount, data)

 

First, check if they have that kind of block in their hand.

Code:java

// This is just for the example, you can change the material
if(player.getItemInHand().getType() == Material.WOOL) {
ItemStack item = player.getItemInHand();
item.setDurability(DyeColor.valueOf(args[0]).getData());
/* Ignore the deprecation, as there's no other method,
*  else then opening the enum and seeing the value of every color and then comparing,
*  so doing it like that is better.
*/ 
}

 

So do I have to change the dyecolor value for each colour

 

Ps300300 Not exactly, you change the durability value with another value which you got from the DyeColor enum.