001/*
002 * Java Genetic Algorithm Library (jenetics-7.0.0).
003 * Copyright (c) 2007-2022 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 */
020package io.jenetics.util;
021
022import static java.lang.String.format;
023import static io.jenetics.internal.util.Hashes.hash;
024
025import java.io.DataInput;
026import java.io.DataOutput;
027import java.io.IOException;
028import java.io.InvalidObjectException;
029import java.io.ObjectInputStream;
030import java.io.Serial;
031import java.io.Serializable;
032
033/**
034 * Double range class.
035 *
036 * @implNote
037 * This class is immutable and thread-safe.
038 *
039 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
040 * @version 6.0
041 * @since 3.2
042 */
043public final /*record*/ class DoubleRange implements Serializable {
044
045        @Serial
046        private static final long serialVersionUID = 2L;
047
048        private final double _min;
049        private final double _max;
050
051        private DoubleRange(final double min, final double max) {
052                if (min > max) {
053                        throw new IllegalArgumentException(format(
054                                "Min greater than max: %s > %s", min, max
055                        ));
056                }
057
058                _min = min;
059                _max = max;
060        }
061
062        /**
063         * Return the minimum value of the double range.
064         *
065         * @return the minimum value of the double range
066         */
067        public double min() {
068                return _min;
069        }
070
071        /**
072         * Return the maximum value of the double range.
073         *
074         * @return the maximum value of the double range
075         */
076        public double max() {
077                return _max;
078        }
079
080        /**
081         * Create a new {@code DoubleRange} object with the given {@code min} and
082         * {@code max} values.
083         *
084         * @param min the lower bound of the double range
085         * @param max the upper bound of the double range
086         * @return a new {@code DoubleRange} object
087         * @throws IllegalArgumentException if {@code min > max}
088         */
089        public static DoubleRange of(final double min, final double max) {
090                return new DoubleRange(min, max);
091        }
092
093        @Override
094        public int hashCode() {
095                return hash(_min, hash(_max));
096        }
097
098        @Override
099        public boolean equals(final Object obj) {
100                return obj == this ||
101                        obj instanceof DoubleRange other &&
102                        Double.compare(_min, other._min) == 0 &&
103                        Double.compare(_max, other._max) == 0;
104        }
105
106        @Override
107        public String toString() {
108                return "[" + _min + ", " + _max + "]";
109        }
110
111
112        /* *************************************************************************
113         *  Java object serialization
114         * ************************************************************************/
115
116        @Serial
117        private Object writeReplace() {
118                return new SerialProxy(SerialProxy.DOUBLE_RANGE, this);
119        }
120
121        @Serial
122        private void readObject(final ObjectInputStream stream)
123                throws InvalidObjectException
124        {
125                throw new InvalidObjectException("Serialization proxy required.");
126        }
127
128        void write(final DataOutput out) throws IOException {
129                out.writeDouble(_min);
130                out.writeDouble(_max);
131        }
132
133        static DoubleRange read(final DataInput in) throws IOException {
134                return of(in.readDouble(), in.readDouble());
135        }
136
137}