001 /*
002 * Java GPX Library (jpx-3.1.0).
003 * Copyright (c) 2016-2023 Franz Wilhelmstötter
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 *
017 * Author:
018 * Franz Wilhelmstötter (franz.wilhelmstoetter@gmail.com)
019 */
020 package io.jenetics.jpx.format;
021
022 import static java.util.Objects.requireNonNull;
023 import static io.jenetics.jpx.format.LocationFormatter.PROTECTED_CHARS;
024
025 import java.text.ParsePosition;
026 import java.util.Optional;
027
028 /**
029 * A format object which returns a constant value.
030 *
031 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
032 * @version 2.2
033 * @since 1.4
034 */
035 final class ConstFormat implements Format {
036
037 private final String _value;
038
039 /**
040 * Create a new <em>constant</em> location format object.
041 *
042 * @param value the constant value, returned by the
043 * {@link Format#format(Location)} method
044 */
045 private ConstFormat(final String value) {
046 _value = requireNonNull(value);
047 }
048
049 @Override
050 public Optional<String> format(final Location value) {
051 return Optional.of(_value);
052 }
053
054 @Override
055 public void parse(
056 final CharSequence in,
057 final ParsePosition pos,
058 final LocationBuilder builder
059 ) {
060 final int start = pos.getIndex();
061 final int end = start + _value.length();
062
063 if (end <= in.length()) {
064 final var s = in.subSequence(start, end).toString();
065 if (s.equals(_value)) {
066 pos.setIndex(end);
067 } else {
068 pos.setErrorIndex(start);
069 throw new ParseException(
070 String.format("Not found constant '%s'", _value),
071 in,
072 start
073 );
074 }
075 }
076 }
077
078 @Override
079 public String toPattern() {
080 return escape(_value);
081 }
082
083 private static String escape(final String value) {
084 final StringBuilder out = new StringBuilder();
085 boolean quoted = false;
086 for (int i = 0; i < value.length(); ++i) {
087 final char c = value.charAt(i);
088 if (PROTECTED_CHARS.contains(c)) {
089 quoted = true;
090 }
091 if (c == '\'') {
092 out.append(c);
093 }
094 out.append(c);
095 }
096
097 return quoted
098 ? "'" + out + "'"
099 : out.toString();
100 }
101
102 static ConstFormat of(final String value) {
103 return new ConstFormat(value);
104 }
105
106 }
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