01 /*
02 * Java GPX Library (jpx-3.1.0).
03 * Copyright (c) 2016-2023 Franz Wilhelmstötter
04 *
05 * Licensed under the Apache License, Version 2.0 (the "License");
06 * you may not use this file except in compliance with the License.
07 * You may obtain a copy of the License at
08 *
09 * 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 * Author:
18 * Franz Wilhelmstötter (franz.wilhelmstoetter@gmail.com)
19 */
20 package io.jenetics.jpx.format;
21
22 import static java.util.Objects.requireNonNull;
23
24 import java.text.ParsePosition;
25 import java.util.List;
26 import java.util.Optional;
27
28 /**
29 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
30 * @version 2.2
31 * @since 1.4
32 */
33 class OptionalFormat implements Format {
34
35 private final Format _format;
36
37 private OptionalFormat(final Format format) {
38 _format = requireNonNull(format);
39 }
40
41 @Override
42 public Optional<String> format(final Location value) {
43 return Optional.of(_format.format(value).orElse(""));
44 }
45
46 @Override
47 public void parse(
48 final CharSequence in,
49 final ParsePosition pos,
50 final LocationBuilder builder
51 ) {
52 int index = pos.getIndex();
53 int errorIndex = pos.getErrorIndex();
54 LocationBuilder before = builder.copy();
55
56 try {
57 _format.parse(in, pos, builder);
58 } catch (ParseException e){
59 builder.copy(before);
60 pos.setIndex(index);
61 pos.setErrorIndex(errorIndex);
62 }
63 }
64
65 @Override
66 public String toPattern() {
67 return String.format("[%s]", _format.toPattern());
68 }
69
70 static OptionalFormat of(final List<Format> formats) {
71 return new OptionalFormat(CompositeFormat.of(formats));
72 }
73
74 }
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