def ipopo_state_to_str(state):
    """
    Converts the state of a component instance to its string representation

    :param state: The state of an iPOPO component
    :return: A string representation of the state
    """
    ipopo_states = {(0): 'INVALID', (1): 'VALID', (2): 'KILLED', (3):
        'VALIDATING', (4): 'ERRONEOUS'}
    return ipopo_states.get(state, 'Unknown state ({0})'.format(state))
