001 /*
002 * Java Genetic Algorithm Library (jenetics-4.2.0).
003 * Copyright (c) 2007-2018 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
024 import java.io.Serializable;
025
026 /**
027 * Double range class.
028 *
029 * @implNote
030 * This class is immutable and thread-safe.
031 *
032 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
033 * @version 3.2
034 * @since 3.2
035 */
036 public final class DoubleRange implements Serializable {
037
038 private static final long serialVersionUID = 1L;
039
040 private final double _min;
041 private final double _max;
042
043 private DoubleRange(final double min, final double max) {
044 if (min > max) {
045 throw new IllegalArgumentException(format(
046 "Min greater than max: %s > %s", min, max
047 ));
048 }
049
050 _min = min;
051 _max = max;
052 }
053
054 /**
055 * Return the minimum value of the double range.
056 *
057 * @return the minimum value of the double range
058 */
059 public double getMin() {
060 return _min;
061 }
062
063 /**
064 * Return the maximum value of the double range.
065 *
066 * @return the maximum value of the double range
067 */
068 public double getMax() {
069 return _max;
070 }
071
072 /**
073 * Create a new {@code DoubleRange} object with the given {@code min} and
074 * {@code max} values.
075 *
076 * @param min the lower bound of the double range
077 * @param max the upper bound of the double range
078 * @return a new {@code DoubleRange} object
079 * @throws IllegalArgumentException if {@code min > max}
080 */
081 public static DoubleRange of(final double min, final double max) {
082 return new DoubleRange(min, max);
083 }
084
085 @Override
086 public int hashCode() {
087 int hash = 17;
088 hash += 31*Double.hashCode(_max) + 37;
089 hash += 31*Double.hashCode(_min) + 37;
090 return hash;
091 }
092
093 @Override
094 public boolean equals(final Object obj) {
095 return obj == this ||
096 obj instanceof DoubleRange &&
097 Double.compare(_min, ((DoubleRange)obj)._min) == 0 &&
098 Double.compare(_max, ((DoubleRange)obj)._max) == 0;
099 }
100
101 @Override
102 public String toString() {
103 return "[" + _min + ", " + _max + "]";
104 }
105
106 }
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