1   /* Copyright 2022-2025 Luc Maisonobe
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.files.sinex;
18  
19  import java.util.regex.Matcher;
20  import java.util.regex.Pattern;
21  
22  /** Base class for version line.
23   * @param <T> type of the SINEX files parse info
24   * @author Luc Maisonobe
25   * @since 13.0
26   */
27  abstract class VersionParser<T extends ParseInfo<?>> implements LineParser<T> {
28  
29      /** Pattern for version line. */
30      private final Pattern pattern;
31  
32      /** Simple constructor.
33       * @param key file format key
34       */
35      protected VersionParser(final String key) {
36          pattern = Pattern.compile("%=" + key + " \\d\\.\\d\\d .+" +
37                                    " (\\d{2,4}:\\d{3}:\\d{5}) .+" +
38                                    " (\\d{2,4}:\\d{3}:\\d{5}) (\\d{2,4}:\\d{3}:\\d{5})" +
39                                    " . .*");
40      }
41  
42      /** {@inheritDoc} */
43      @Override
44      public boolean parseIfRecognized(final T parseInfo) {
45          final Matcher matcher = pattern.matcher(parseInfo.getLine());
46          if (matcher.matches()) {
47              // we have recognized a SINEX file first line
48              // parse the various dates it contains
49              parseInfo.setCreationDate(matcher.group(1));
50              parseInfo.setStartDateIfEarlier(matcher.group(2));
51              parseInfo.setEndDateIfLater(matcher.group(3));
52              return true;
53          } else {
54              // this is not an expected SINEX file
55              return false;
56          }
57      }
58  
59  }