001 /*
002 * Java Genetic Algorithm Library (jenetics-6.3.0).
003 * Copyright (c) 2007-2021 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.util;
021
022 import static java.lang.String.format;
023 import static io.jenetics.internal.util.Hashes.hash;
024
025 import java.io.DataInput;
026 import java.io.DataOutput;
027 import java.io.IOException;
028 import java.io.InvalidObjectException;
029 import java.io.ObjectInputStream;
030 import java.io.Serializable;
031
032 /**
033 * Double range class.
034 *
035 * @implNote
036 * This class is immutable and thread-safe.
037 *
038 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
039 * @version 6.0
040 * @since 3.2
041 */
042 public final /*record*/ class DoubleRange implements Serializable {
043
044 private static final long serialVersionUID = 2L;
045
046 private final double _min;
047 private final double _max;
048
049 private DoubleRange(final double min, final double max) {
050 if (min > max) {
051 throw new IllegalArgumentException(format(
052 "Min greater than max: %s > %s", min, max
053 ));
054 }
055
056 _min = min;
057 _max = max;
058 }
059
060 /**
061 * Return the minimum value of the double range.
062 *
063 * @return the minimum value of the double range
064 */
065 public double min() {
066 return _min;
067 }
068
069 /**
070 * Return the maximum value of the double range.
071 *
072 * @return the maximum value of the double range
073 */
074 public double max() {
075 return _max;
076 }
077
078 /**
079 * Create a new {@code DoubleRange} object with the given {@code min} and
080 * {@code max} values.
081 *
082 * @param min the lower bound of the double range
083 * @param max the upper bound of the double range
084 * @return a new {@code DoubleRange} object
085 * @throws IllegalArgumentException if {@code min > max}
086 */
087 public static DoubleRange of(final double min, final double max) {
088 return new DoubleRange(min, max);
089 }
090
091 @Override
092 public int hashCode() {
093 return hash(_min, hash(_max));
094 }
095
096 @Override
097 public boolean equals(final Object obj) {
098 return obj == this ||
099 obj instanceof DoubleRange &&
100 Double.compare(_min, ((DoubleRange)obj)._min) == 0 &&
101 Double.compare(_max, ((DoubleRange)obj)._max) == 0;
102 }
103
104 @Override
105 public String toString() {
106 return "[" + _min + ", " + _max + "]";
107 }
108
109
110 /* *************************************************************************
111 * Java object serialization
112 * ************************************************************************/
113
114 private Object writeReplace() {
115 return new Serial(Serial.DOUBLE_RANGE, this);
116 }
117
118 private void readObject(final ObjectInputStream stream)
119 throws InvalidObjectException
120 {
121 throw new InvalidObjectException("Serialization proxy required.");
122 }
123
124 void write(final DataOutput out) throws IOException {
125 out.writeDouble(_min);
126 out.writeDouble(_max);
127 }
128
129 static DoubleRange read(final DataInput in) throws IOException {
130 return of(in.readDouble(), in.readDouble());
131 }
132
133 }
|