FixedTransformProvider.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.frames;
- import java.io.Serializable;
- import java.util.HashMap;
- import java.util.Map;
- import org.hipparchus.Field;
- import org.hipparchus.CalculusFieldElement;
- import org.orekit.time.AbsoluteDate;
- import org.orekit.time.FieldAbsoluteDate;
- /**
- ** Transform provider using fixed transform.
- * @author Luc Maisonobe
- */
- public class FixedTransformProvider implements TransformProvider {
- /** Serializable UID. */
- private static final long serialVersionUID = 20170106L;
- /** Fixed transform. */
- private final Transform transform;
- /** Cached field-based transforms. */
- private final transient Map<Field<? extends CalculusFieldElement<?>>, FieldTransform<? extends CalculusFieldElement<?>>> cached;
- /** Simple constructor.
- * @param transform fixed transform
- */
- public FixedTransformProvider(final Transform transform) {
- this.transform = transform;
- this.cached = new HashMap<>();
- }
- /** {@inheritDoc} */
- public Transform getTransform(final AbsoluteDate date) {
- return transform;
- }
- /** {@inheritDoc} */
- @Override
- public <T extends CalculusFieldElement<T>> FieldTransform<T> getTransform(final FieldAbsoluteDate<T> date) {
- @SuppressWarnings("unchecked")
- FieldTransform<T> ft = (FieldTransform<T>) cached.get(date.getField());
- if (ft == null) {
- ft = new FieldTransform<>(date.getField(), transform);
- cached.put(date.getField(), ft);
- }
- return ft;
- }
- /** Replace the instance with a data transfer object for serialization.
- * <p>
- * This intermediate class serializes nothing.
- * </p>
- * @return data transfer object that will be serialized
- */
- private Object writeReplace() {
- return new DataTransferObject(transform);
- }
- /** Internal class used only for serialization. */
- private static class DataTransferObject implements Serializable {
- /** Serializable UID. */
- private static final long serialVersionUID = 20170106L;
- /** Fixed transform. */
- private final Transform transform;
- /** Simple constructor.
- * @param transform fixed transform
- */
- private DataTransferObject(final Transform transform) {
- this.transform = transform;
- }
- /** Replace the deserialized data transfer object with a {@link FixedTransformProvider}.
- * @return replacement {@link FixedTransformProvider}
- */
- private Object readResolve() {
- return new FixedTransformProvider(transform);
- }
- }
- }