Normalizer.java
/* Copyright 2002-2022 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.gravity.potential;
import org.orekit.forces.gravity.potential.UnnormalizedSphericalHarmonicsProvider.UnnormalizedSphericalHarmonics;
import org.orekit.time.AbsoluteDate;
/** Wrapper providing normalized coefficients from un-normalized ones.
* @author Luc Maisonobe
* @since 6.0
*/
class Normalizer implements NormalizedSphericalHarmonicsProvider {
/** Un-normalized provider to which everything is delegated. */
private final UnnormalizedSphericalHarmonicsProvider unnormalized;
/** Factors for normalization. */
private final double[][] factors;
/** Simple constructor.
* @param unnormalized provider to normalize
*/
Normalizer(final UnnormalizedSphericalHarmonicsProvider unnormalized) {
this.unnormalized = unnormalized;
this.factors = GravityFieldFactory.getUnnormalizationFactors(unnormalized.getMaxDegree(),
unnormalized.getMaxOrder());
}
/** {@inheritDoc} */
@Override
public int getMaxDegree() {
return unnormalized.getMaxDegree();
}
/** {@inheritDoc} */
@Override
public int getMaxOrder() {
return unnormalized.getMaxOrder();
}
/** {@inheritDoc} */
@Override
public double getMu() {
return unnormalized.getMu();
}
/** {@inheritDoc} */
@Override
public double getAe() {
return unnormalized.getAe();
}
/** {@inheritDoc} */
@Override
public AbsoluteDate getReferenceDate() {
return unnormalized.getReferenceDate();
}
/** {@inheritDoc} */
@Deprecated
@Override
public double getOffset(final AbsoluteDate date) {
return unnormalized.getOffset(date);
}
/** {@inheritDoc} */
@Override
public TideSystem getTideSystem() {
return unnormalized.getTideSystem();
}
/** {@inheritDoc} */
@Override
public NormalizedSphericalHarmonics onDate(final AbsoluteDate date) {
final UnnormalizedSphericalHarmonics harmonics = unnormalized.onDate(date);
return new NormalizedSphericalHarmonics() {
/** {@inheritDoc} */
@Override
public AbsoluteDate getDate() {
return date;
}
/** {@inheritDoc} */
@Override
public double getNormalizedCnm(final int n, final int m) {
return harmonics.getUnnormalizedCnm(n, m) / factors[n][m];
}
/** {@inheritDoc} */
@Override
public double getNormalizedSnm(final int n, final int m) {
return harmonics.getUnnormalizedSnm(n, m) / factors[n][m];
}
};
}
}