EulerWriter.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.files.ccsds.ndm.adm.apm;
import java.io.IOException;
import org.orekit.files.ccsds.definitions.Units;
import org.orekit.files.ccsds.ndm.adm.AttitudeEndoints;
import org.orekit.files.ccsds.section.AbstractWriter;
import org.orekit.files.ccsds.utils.generation.Generator;
import org.orekit.utils.units.Unit;
/** Writer for Euler data.
* @author Luc Maisonobe
* @since 11.0
*/
class EulerWriter extends AbstractWriter {
/** Suffix for angles. */
private static String ANGLE = "_ANGLE";
/** Suffix for rates. */
private static String RATE = "_RATE";
/** Euler block. */
private final Euler euler;
/** Create a writer.
* @param xmlTag name of the XML tag surrounding the section
* @param kvnTag name of the KVN tag surrounding the section (may be null)
* @param euler Euler data to write
*/
EulerWriter(final String xmlTag, final String kvnTag,
final Euler euler) {
super(xmlTag, kvnTag);
this.euler = euler;
}
/** {@inheritDoc} */
@Override
protected void writeContent(final Generator generator) throws IOException {
generator.writeComments(euler.getComments());
// endpoints
generator.writeEntry(EulerKey.EULER_FRAME_A.name(), euler.getEndpoints().getFrameA().getName(), null, true);
generator.writeEntry(EulerKey.EULER_FRAME_B.name(), euler.getEndpoints().getFrameB().getName(), null, true);
generator.writeEntry(EulerKey.EULER_DIR.name(),
euler.getEndpoints().isA2b() ? AttitudeEndoints.A2B : AttitudeEndoints.B2A,
null, true);
// angles
final String seq = euler.getEulerRotSeq().name();
final double[] angles = euler.getRotationAngles();
generator.writeEntry(EulerKey.EULER_ROT_SEQ.name(),
seq.replace('X', '1').replace('Y', '2').replace('Z', '3'),
null, true);
generator.writeEntry(EulerKey.RATE_FRAME.name(),
euler.rateFrameIsA() ? EulerKey.EULER_FRAME_A.name() : EulerKey.EULER_FRAME_B.name(),
null, true);
// if we don't have rates, at least we need angles
// (we may have only rates, as orientation is already given by mandatory quaternion)
final boolean needsAngles = !euler.hasRates();
generator.writeEntry(seq.charAt(0) + ANGLE, angles[0], Unit.DEGREE, needsAngles);
generator.writeEntry(seq.charAt(1) + ANGLE, angles[1], Unit.DEGREE, needsAngles);
generator.writeEntry(seq.charAt(2) + ANGLE, angles[2], Unit.DEGREE, needsAngles);
// rates
if (euler.hasRates()) {
final double[] rates = euler.getRotationRates();
generator.writeEntry(seq.charAt(0) + RATE, rates[0], Units.DEG_PER_S, true);
generator.writeEntry(seq.charAt(1) + RATE, rates[1], Units.DEG_PER_S, true);
generator.writeEntry(seq.charAt(2) + RATE, rates[2], Units.DEG_PER_S, true);
}
}
}