state.cpp

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/**
 * @file
 * @ingroup daq_ocm_libdaq
 * @copyright 2021 ESO - European Southern Observatory
 *
 * @brief Definitions from daq/state.hpp
 */
#include <daq/state.hpp>
 
 
namespace daq {
 
 
bool IsFinalState(State state) noexcept {
    switch (state) {
        case State::Stopped:
        case State::Aborted:
            return true;
        default:
            return false;
    }
}
 
 
bool IsSubsequentState(State before, State after) noexcept {
    if (before == after) {
        return false;
    }
    // If after is a final before it doesn't matter what before is, it cannot occur after a final before
    if (IsFinalState(after)) {
        return false;
    }
 
    // note: We take advantage of that the life-cycle is completely linear, *except* for 
    // aborting + aborted. So those are checked first.
    // As it's always possible to abort: Aborting can occur after any state except Aborted.
 
    if (before == State::Aborting) {
        // Only state that occurs after Aborting is Aborted
        return after == State::Aborted;
    }
 
    // What remains is the linear befores for the normal life-cycle
    return static_cast<int>(before) > static_cast<int>(after);
}
 
 
} // namespace daq