1   /* Copyright 2002-2025 CS GROUP
2    * Licensed to CS GROUP (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  package org.orekit.time;
18  
19  import java.util.List;
20  
21  /** Interface for selecting dates within an interval.
22   * <p>
23   * This interface is mainly useful for {@link
24   * org.orekit.estimation.measurements.generation.AbstractScheduler scheduling}
25   * measurements {@link org.orekit.estimation.measurements.generation.Generator
26   * generation}.
27   * </p>
28   * @see org.orekit.estimation.measurements.generation.AbstractScheduler AbstractScheduler
29   * @see org.orekit.estimation.measurements.generation.Generator Generator
30   * @author Luc Maisonobe
31   * @since 9.3
32   */
33  public interface DatesSelector {
34  
35      /** Select dates within an interval.
36       * <p>
37       * The {@code start} and {@code end} date may be either in direct or reverse
38       * chronological order. The list is produced in the same order as {@code start}
39       * and {@code end}, i.e. direct chronological order if {@code start} is earlier
40       * than {@code end} or reverse chronological order if {@code start} is later
41       * than {@code end}.
42       * </p>
43       * <p>
44       * The ordering (direct or reverse chronological order) should not be changed
45       * between calls, otherwise unpredictable results may occur.
46       * </p>
47       * @param start interval start
48       * @param end interval end
49       * @return selected dates within this interval
50       */
51      List<AbsoluteDate> selectDates(AbsoluteDate start, AbsoluteDate end);
52  
53  }