public static void setPresistedData(EntityPlayer player, String key, String value)
    {
        NBTTagCompound presistedData = player.getEntityData().getCompoundTag(player.PERSISTED_NBT_TAG);
        if (presistedData == null)
            presistedData = new NBTTagCompound();
        presistedData.setString(key, value);
        player.getEntityData().setTag(player.PERSISTED_NBT_TAG, presistedData);
    }

    public static String getPresistedData(EntityPlayer player, String key)
    {
        return player.getEntityData().getCompoundTag(player.PERSISTED_NBT_TAG).getString(key);
    }

    public static boolean hasPresistedData(EntityPlayer player, String key)
    {
        return player.getEntityData().getCompoundTag(player.PERSISTED_NBT_TAG).hasKey(key);
    }