1   /* Copyright 2002-2019 CS Systèmes d'Information
2    * Licensed to CS Systèmes d'Information (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.orekit.frames;
19  
20  import java.io.Serializable;
21  
22  import org.hipparchus.RealFieldElement;
23  import org.orekit.time.AbsoluteDate;
24  import org.orekit.time.FieldAbsoluteDate;
25  
26  /** Interface for Transform providers.
27   * <p>The transform provider interface is mainly used to define the
28   * transform between a frame and its parent frame.
29   * </p>
30   * @author Luc Maisonobe
31   */
32  public interface TransformProvider extends Serializable {
33  
34      /** Get the {@link Transform} corresponding to specified date.
35       * @param date current date
36       * @return transform at specified date
37       */
38      Transform getTransform(AbsoluteDate date);
39  
40      /** Get the {@link FieldTransform} corresponding to specified date.
41       * @param date current date
42       * @param <T> type of the field elements
43       * @return transform at specified date
44            * @since 9.0
45       */
46      <T extends RealFieldElement<T>> FieldTransform<T> getTransform(FieldAbsoluteDate<T> date);
47  
48  }