AbstractManeuverTriggers.java
/* Copyright 2002-2023 CS GROUP
* Licensed to CS GROUP (CS) under one or more
* 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
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.orekit.forces.maneuvers.trigger;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.hipparchus.CalculusFieldElement;
import org.hipparchus.Field;
import org.orekit.propagation.FieldSpacecraftState;
import org.orekit.propagation.SpacecraftState;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.FieldAbsoluteDate;
import org.orekit.utils.TimeSpanMap;
/** Base class for triggers.
* @author Luc Maisonobe
* @since 11.1
*/
public abstract class AbstractManeuverTriggers implements ManeuverTriggers {
/** Firing time spans. */
private TimeSpanMap<Boolean> firings;
/** Propagation direction. */
private boolean forward;
/** Resetters for the maneuver triggers. */
private final List<ManeuverTriggersResetter> resetters;
/** Cached field-based resetters. */
private final transient Map<Field<? extends CalculusFieldElement<?>>, List<FieldManeuverTriggersResetter<?>>> fieldResetters;
/** Simple constructor.
*/
protected AbstractManeuverTriggers() {
this.firings = new TimeSpanMap<>(Boolean.FALSE);
this.resetters = new ArrayList<>();
this.fieldResetters = new HashMap<>();
}
/** {@inheritDoc} */
@Override
public void init(final SpacecraftState initialState, final AbsoluteDate target) {
forward = target.isAfterOrEqualTo(initialState);
firings = new TimeSpanMap<>(Boolean.FALSE);
initializeResetters(initialState, target);
if (isFiringOnInitialState(initialState, forward)) {
if (forward) {
firings.addValidAfter(Boolean.TRUE, initialState.getDate(), false);
} else {
firings.addValidBefore(Boolean.TRUE, initialState.getDate(), false);
}
}
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
@Override
public <T extends CalculusFieldElement<T>> void init(final FieldSpacecraftState<T> initialState, final FieldAbsoluteDate<T> target) {
forward = target.isAfterOrEqualTo(initialState);
firings = new TimeSpanMap<>(Boolean.FALSE);
// check if we already have resetters for this field
final List<FieldManeuverTriggersResetter<?>> list = fieldResetters.get(initialState.getDate().getField());
if (list != null) {
for (FieldManeuverTriggersResetter<?> r : list) {
((FieldManeuverTriggersResetter<T>) r).init(initialState, target);
}
}
if (isFiringOnInitialState(initialState.toSpacecraftState(), forward)) {
if (forward) {
firings.addValidAfter(Boolean.TRUE, initialState.getDate().toAbsoluteDate(), false);
} else {
firings.addValidBefore(Boolean.TRUE, initialState.getDate().toAbsoluteDate(), false);
}
}
}
/**
* Method to check if the thruster is firing on initialization. can be called by
* sub classes
*
* @param initialState initial spacecraft state
* @param isForward if true, propagation will be in the forward direction
* @return true if firing in propagation direction
*/
protected abstract boolean isFiringOnInitialState(SpacecraftState initialState, boolean isForward);
/** {@inheritDoc} */
@Override
public boolean isFiring(final AbsoluteDate date, final double[] parameters) {
return firings.get(date);
}
/** {@inheritDoc} */
@Override
public <S extends CalculusFieldElement<S>> boolean isFiring(final FieldAbsoluteDate<S> date, final S[] parameters) {
return firings.get(date.toAbsoluteDate());
}
/** Get the firings detected during last propagation.
* @return firings detected during last propagation
*/
public TimeSpanMap<Boolean> getFirings() {
return firings;
}
/** {@inheritDoc} */
@Override
public void addResetter(final ManeuverTriggersResetter resetter) {
resetters.add(resetter);
}
/** {@inheritDoc} */
@Override
public <T extends CalculusFieldElement<T>> void addResetter(final Field<T> field, final FieldManeuverTriggersResetter<T> resetter) {
// check if we already have resetters for this field
List<FieldManeuverTriggersResetter<?>> list = fieldResetters.get(field);
if (list == null) {
list = new ArrayList<>();
fieldResetters.put(field, list);
}
// add the resetter to the list
list.add(resetter);
}
/** Initialize resetters.
* @param initialState initial state
* @param target target date for the propagation
*/
protected void initializeResetters(final SpacecraftState initialState, final AbsoluteDate target) {
for (final ManeuverTriggersResetter r : resetters) {
r.init(initialState, target);
}
}
/** Notify resetters.
* @param state spacecraft state at trigger date (before applying the maneuver)
* @param start if true, the trigger is the start of the maneuver
*/
protected void notifyResetters(final SpacecraftState state, final boolean start) {
for (final ManeuverTriggersResetter r : resetters) {
r.maneuverTriggered(state, start);
}
}
/** Apply resetters.
* @param state spacecraft state at trigger date
* @return reset state
*/
protected SpacecraftState applyResetters(final SpacecraftState state) {
SpacecraftState reset = state;
for (final ManeuverTriggersResetter r : resetters) {
reset = r.resetState(reset);
}
return reset;
}
/** Initialize resetters.
* @param initialState initial state
* @param target target date for the propagation
* @param <T> type of the field elements
*/
protected <T extends CalculusFieldElement<T>> void initializeResetters(final FieldSpacecraftState<T> initialState, final FieldAbsoluteDate<T> target) {
final List<FieldManeuverTriggersResetter<?>> list = fieldResetters.get(initialState.getDate().getField());
if (list != null) {
for (final FieldManeuverTriggersResetter<?> r : list) {
@SuppressWarnings("unchecked")
final FieldManeuverTriggersResetter<T> tr = (FieldManeuverTriggersResetter<T>) r;
tr.init(initialState, target);
}
}
}
/** Notify resetters.
* @param state spacecraft state at trigger date (before applying the maneuver)
* @param start if true, the trigger is the start of the maneuver
* @param <T> type of the field elements
*/
protected <T extends CalculusFieldElement<T>> void notifyResetters(final FieldSpacecraftState<T> state, final boolean start) {
final List<FieldManeuverTriggersResetter<?>> list = fieldResetters.get(state.getDate().getField());
if (list != null) {
for (final FieldManeuverTriggersResetter<?> r : list) {
@SuppressWarnings("unchecked")
final FieldManeuverTriggersResetter<T> tr = (FieldManeuverTriggersResetter<T>) r;
tr.maneuverTriggered(state, start);
}
}
}
/** Apply resetters.
* @param state spacecraft state at trigger date
* @param <T> type of the field elements
* @return reset state
*/
protected <T extends CalculusFieldElement<T>> FieldSpacecraftState<T>
applyResetters(final FieldSpacecraftState<T> state) {
FieldSpacecraftState<T> reset = state;
final List<FieldManeuverTriggersResetter<?>> list = fieldResetters.get(state.getDate().getField());
if (list != null) {
for (final FieldManeuverTriggersResetter<?> r : list) {
@SuppressWarnings("unchecked")
final FieldManeuverTriggersResetter<T> tr = (FieldManeuverTriggersResetter<T>) r;
reset = tr.resetState(reset);
}
}
return reset;
}
}