OceanTidesReader.java
/* Copyright 2002-2020 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 java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.hipparchus.util.FastMath;
import org.orekit.data.DataLoader;
import org.orekit.errors.OrekitException;
import org.orekit.errors.OrekitMessages;
/** Reader for ocean tides coefficients.
* @author Luc Maisonobe
* @see OceanTidesWave
* @since 6.1
*/
public abstract class OceanTidesReader implements DataLoader {
/** Regular expression for supported files names. */
private final String supportedNames;
/** Maximal degree to parse. */
private int maxParseDegree;
/** Maximal order to parse. */
private int maxParseOrder;
/** Loaded waves. */
private List<OceanTidesWave> waves;
/** Name name of the parsed file (or zip entry). */
private String name;
/** Triangular arrays to hold all coefficients. */
private Map<Integer, double[][][]> coefficients;
/** Max degree encountered up to now. */
private int maxDegree;
/** Max order encountered up to now. */
private int maxOrder;
/** Simple constructor.
* @param supportedNames regular expression for supported files names
*/
public OceanTidesReader(final String supportedNames) {
this.supportedNames = supportedNames;
this.maxParseDegree = Integer.MAX_VALUE;
this.maxParseOrder = Integer.MAX_VALUE;
this.waves = new ArrayList<OceanTidesWave>();
}
/** Get the regular expression for supported files names.
* @return regular expression for supported files names
*/
public String getSupportedNames() {
return supportedNames;
}
/** Set the degree limit for the next file parsing.
* @param maxParseDegree maximal degree to parse (may be safely
* set to {@link Integer#MAX_VALUE} to parse all available coefficients)
*/
public void setMaxParseDegree(final int maxParseDegree) {
this.maxParseDegree = maxParseDegree;
}
/** Get the degree limit for the next file parsing.
* @return degree limit for the next file parsing
*/
public int getMaxParseDegree() {
return maxParseDegree;
}
/** Set the order limit for the next file parsing.
* @param maxParseOrder maximal order to parse (may be safely
* set to {@link Integer#MAX_VALUE} to parse all available coefficients)
*/
public void setMaxParseOrder(final int maxParseOrder) {
this.maxParseOrder = maxParseOrder;
}
/** Get the order limit for the next file parsing.
* @return order limit for the next file parsing
*/
public int getMaxParseOrder() {
return maxParseOrder;
}
/** {@inheritDoc} */
@Override
public boolean stillAcceptsData() {
return waves.isEmpty();
}
/** Start parsing.
* <p>
* This method must be called by subclasses when they start parsing a file
* </p>
* @param fileName name of the file (or zip entry)
*/
protected void startParse(final String fileName) {
this.name = fileName;
this.coefficients = new HashMap<Integer, double[][][]>();
this.maxDegree = -1;
this.maxOrder = -1;
}
/** Check if coefficients can be added.
* @param n degree of the coefficients
* @param m order of the coefficients
* @return true if coefficients can be added
*/
public boolean canAdd(final int n, final int m) {
maxDegree = FastMath.max(maxDegree, n);
maxOrder = FastMath.max(maxOrder, m);
return n <= getMaxParseDegree() && m <= getMaxParseOrder();
}
/** Add parsed coefficients.
* @param doodson Doodson number of the current wave
* @param n degree of the coefficients
* @param m order of the coefficients
* @param cPlus C+(n,m)
* @param sPlus S+(n,m)
* @param cMinus C-(n,m)
* @param sMinus S-(n,m)
* @param lineNumber number of the parsed line
* @param line text of the line
*/
protected void addWaveCoefficients(final int doodson, final int n, final int m,
final double cPlus, final double sPlus,
final double cMinus, final double sMinus,
final int lineNumber, final String line) {
if (!coefficients.containsKey(doodson)) {
// prepare the triangular array to hold coefficients
final double[][][] array = new double[getMaxParseDegree() + 1][][];
for (int i = 0; i <= getMaxParseDegree(); ++i) {
array[i] = new double[FastMath.min(i, getMaxParseOrder()) + 1][4];
for (double[] a : array[i]) {
Arrays.fill(a, Double.NaN);
}
}
coefficients.put(doodson, array);
}
// store the fields
final double[] cs = coefficients.get(doodson)[n][m];
cs[0] = cPlus;
cs[1] = sPlus;
cs[2] = cMinus;
cs[3] = sMinus;
}
/** End parsing.
* <p>
* This method must be called by subclasses when they end parsing a file
* </p>
*/
protected void endParse() {
// check requested degree and order
if (maxDegree < getMaxParseDegree() || maxOrder < getMaxParseOrder()) {
throw new OrekitException(OrekitMessages.OCEAN_TIDE_DATA_DEGREE_ORDER_LIMITS,
name, maxDegree, maxOrder);
}
for (final Map.Entry<Integer, double[][][]> entry : coefficients.entrySet()) {
// check wave degree and order
int waveDegree = -1;
int waveOrder = -1;
for (int i = 0; i < entry.getValue().length; ++i) {
for (int j = 0; j < entry.getValue()[i].length; ++j) {
if (!Double.isNaN(entry.getValue()[i][j][0])) {
waveDegree = FastMath.max(waveDegree, i);
waveOrder = FastMath.max(waveOrder, j);
}
}
}
// create wave
waves.add(new OceanTidesWave(entry.getKey(), waveDegree, waveOrder, entry.getValue()));
}
}
/** Get the loaded waves.
* @return loaded waves
*/
public List<OceanTidesWave> getWaves() {
return waves;
}
}