ManeuverTriggers.java

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package org.orekit.forces.maneuvers.trigger;

import org.hipparchus.CalculusFieldElement;
import org.orekit.forces.maneuvers.Maneuver;
import org.orekit.propagation.FieldSpacecraftState;
import org.orekit.propagation.SpacecraftState;
import org.orekit.propagation.events.EventDetectorsProvider;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.FieldAbsoluteDate;
import org.orekit.utils.ParameterDriversProvider;

/** Generic interface for the maneuver triggers used in a {@link Maneuver}.
 * @author Maxime Journot
 * @since 10.2
 */
public interface ManeuverTriggers extends ParameterDriversProvider, EventDetectorsProvider {

    /** Initialization method called at propagation start.
     * <p>
     * The default implementation does nothing.
     * </p>
     * @param initialState initial spacecraft state (at the start of propagation).
     * @param target date of propagation. Not equal to {@code initialState.getDate()}.
     */
    default void init(SpacecraftState initialState, AbsoluteDate target) {
        // nothing by default
    }

    /** Initialization method called at propagation start.
     * <p>
     * The default implementation does nothing.
     * </p>
     * @param initialState initial spacecraft state (at the start of propagation).
     * @param target date of propagation. Not equal to {@code initialState.getDate()}.
     * @param <T> type of the elements
     * @since 11.1
     */
    default <T extends CalculusFieldElement<T>> void init(FieldSpacecraftState<T> initialState, FieldAbsoluteDate<T> target) {
        init(initialState.toSpacecraftState(), target.toAbsoluteDate());
    }

    /** Find out if the maneuver is firing or not.
     * @param date current date
     * @param parameters maneuver triggers parameters
     * @return true if the maneuver is firing, false otherwise
     */
    boolean isFiring(AbsoluteDate date, double[] parameters);

    /** Find out if the maneuver is firing or not.
     * @param date current date
     * @param parameters maneuver triggers parameters
     * @param <T> type of the field elements
     * @return true if the maneuver is firing, false otherwise
     */
    <T extends CalculusFieldElement<T>> boolean isFiring(FieldAbsoluteDate<T> date, T[] parameters);

    /** Get the maneuver name.
     * @return the maneuver name
     */
    default String getName() {
        return "";
    }
}