FieldODEIntegratorBuilder.java

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 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * CS licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.orekit.propagation.conversion;

import org.hipparchus.CalculusFieldElement;
import org.hipparchus.Field;
import org.hipparchus.ode.AbstractFieldIntegrator;
import org.orekit.orbits.FieldCartesianOrbit;
import org.orekit.orbits.FieldOrbit;
import org.orekit.orbits.Orbit;
import org.orekit.orbits.OrbitType;
import org.orekit.orbits.PositionAngleType;
import org.orekit.utils.FieldAbsolutePVCoordinates;
import org.orekit.utils.TimeStampedFieldPVCoordinates;

/**
 * This interface is the top-level abstraction to build first order integrators for propagators conversion.
 *
 * @author Pascal Parraud
 * @author Vincent Cucchietti
 * @since 12.0
 * @param <T> type of the field elements
 */
public interface FieldODEIntegratorBuilder<T extends CalculusFieldElement<T>> {

    /**
     * Build a first order integrator.
     *
     * @param field field to which the elements belong
     * @param orbit reference orbit
     * @param orbitType orbit type to use
     *
     * @return a first order integrator ready to use
     */
    default AbstractFieldIntegrator<T> buildIntegrator(Field<T> field, Orbit orbit, OrbitType orbitType) {
        return buildIntegrator(field, orbit, orbitType, PositionAngleType.MEAN);
    }

    /**
     * Build a first order integrator.
     *
     * @param field field
     * @param orbit reference orbit
     * @param orbitType orbit type to use
     * @param angleType position angle type to use
     *
     * @return a first order integrator ready to use
     * @since 13.0
     */
    AbstractFieldIntegrator<T> buildIntegrator(Field<T> field, Orbit orbit, OrbitType orbitType,
                                               PositionAngleType angleType);

    /**
     * Build a first order integrator.
     *
     * @param orbit reference orbit
     * @param orbitType orbit type to use
     *
     * @return a first order integrator ready to use
     */
    default AbstractFieldIntegrator<T> buildIntegrator(FieldOrbit<T> orbit, OrbitType orbitType) {
        return buildIntegrator(orbit.getA().getField(), orbit.toOrbit(), orbitType);
    }

    /**
     * Build a first order integrator. Non-orbit version.
     *
     * @param fieldAbsolutePVCoordinates absolute position-velocity
     *
     * @return a first order integrator ready to use
     * @since 12.2
     */
    default AbstractFieldIntegrator<T> buildIntegrator(final FieldAbsolutePVCoordinates<T> fieldAbsolutePVCoordinates) {
        final TimeStampedFieldPVCoordinates<T> fieldPVCoordinates = fieldAbsolutePVCoordinates.getPVCoordinates();
        final FieldCartesianOrbit<T> fieldOrbit = new FieldCartesianOrbit<>(fieldPVCoordinates, fieldAbsolutePVCoordinates.getFrame(),
                fieldAbsolutePVCoordinates.getDate().getField().getOne());
        return buildIntegrator(fieldOrbit, OrbitType.CARTESIAN);
    }

    /**
     * Form a non-Field equivalent.
     * @return ODE integrator builder
     * @since 13.0
     */
    ODEIntegratorBuilder toODEIntegratorBuilder();
}