if (!isSuccessorOf(stepToExecuteBefore)) {
            predecessors.add(stepToExecuteBefore);
            stepToExecuteBefore.successors.add(this);
        }
    }

    public void executeBefore(BuildStep stepToExecuteAfter) {
        stepToExecuteAfter.executeAfter(this);
    }

    public Stream<MojoExecution> executions() {
        return mojos.values().stream().flatMap(m -> m.values().stream());