FieldOrekitFixedStepHandler.java

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 * CS licenses this file to You under the Apache License, Version 2.0
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.orekit.propagation.sampling;

import org.hipparchus.CalculusFieldElement;
import org.orekit.propagation.FieldSpacecraftState;
import org.orekit.time.FieldAbsoluteDate;

/** This interface is a space-dynamics aware fixed size step handler.
 *
 * <p>It mirrors the <code>FixedStepHandler</code> interface from <a
 * href="http://commons.apache.org/math/">commons-math</a> but provides
 * a space-dynamics interface to the methods.</p>
 * @author Luc Maisonobe
 * @param <T> type of the field elements
 */
public interface FieldOrekitFixedStepHandler<T extends CalculusFieldElement<T>> {

    /** Initialize step handler at the start of a propagation.
     * <p>
     * This method is called once at the start of the propagation. It
     * may be used by the step handler to initialize some internal data
     * if needed.
     * </p>
     * @param s0 initial state
     * @param t target time for the integration
     * @param step the duration in seconds of the fixed step. This value is
     *             positive even if propagation is backwards.
     */
    default void init(FieldSpacecraftState<T> s0, FieldAbsoluteDate<T> t, T step) {
        // do nothing by default
    }

    /** Handle the current step.
     * @param currentState current state at step time
     */
    void handleStep(FieldSpacecraftState<T> currentState);

    /**
     * Finalize propagation.
     * @param finalState state at propagation end
     * @since 11.0
     */
    default void finish(FieldSpacecraftState<T> finalState) {
        // nothing by default
    }

}