public boolean handlePlayer(EntityPlayer player) {
      for(int i = 0; i < player.field_71071_by.func_70302_i_(); ++i)    // COMMENT:  check all items in players hotbar (i think)
       { // COMMENT: for block start
         ItemStack item = player.field_71071_by.func_70301_a(i);   // COMMENT: get handle for current item
         if(item != null &&   // COMMENT: hotbar slot is not empty
            item.func_77973_b() == ExtraUtils.ethericSword &&   // COMMENT: item is ethericSword
            player.field_71071_by.func_70298_a(i, 1) != null) // COMMENT: if removing item is successfull
         {  // COMMENT: if block start
            player.field_71071_by.func_70441_a(createNewStack());  // give new item
            return true;   // return success, in this case no further code in this sub gets executed
         }  // COMMENT: if block end
      }  // COMMENT: for block end

      return false;  // no success yet so return failure
   }