how can i determine the face by which a block can emit a redstone signal?

Hello, very good, I have a question, I want to know how I can determine the face through which the redstone signal should come out, for example I try to make a block like the vanilla repeater of minecraft I have the model and the code ready, I just want the block to only I can send the redstone signal through the EAST / front side only but I don't know how to do it, this is the code that is responsible for determining the signal intensity

@Override
public int getWeakPower (BlockState blockstate, IBlockReader blockAccess, BlockPos pos, Direction side) {
return 15;
}

Is there a way that in the return I can return more values like the face for which the signal should come out?