001 /*
002 * Java Genetic Algorithm Library (jenetics-7.1.2).
003 * Copyright (c) 2007-2023 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.ext.moea;
021
022 import static io.jenetics.internal.util.SerialIO.readDoubleArray;
023 import static io.jenetics.internal.util.SerialIO.writeDoubleArray;
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.Serial;
031 import java.io.Serializable;
032 import java.util.Arrays;
033 import java.util.Comparator;
034
035 /**
036 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
037 * @version 5.2
038 * @since 5.2
039 */
040 final class SimpleDoubleVec implements Vec<double[]>, Serializable {
041
042 @Serial
043 private static final long serialVersionUID = 2L;
044
045 private final double[] _data;
046
047 SimpleDoubleVec(final double[] data) {
048 Vecs.checkVecLength(data.length);
049 _data = data;
050 }
051
052 @Override
053 public double[] data() {
054 return _data;
055 }
056
057 @Override
058 public int length() {
059 return _data.length;
060 }
061
062 @Override
063 public ElementComparator<double[]> comparator() {
064 return SimpleDoubleVec::cmp;
065 }
066
067 private static int cmp(final double[] u, final double[] v, final int i) {
068 return Double.compare(u[i], v[i]);
069 }
070
071 @Override
072 public ElementDistance<double[]> distance() {
073 return SimpleDoubleVec::dist;
074 }
075
076 private static double dist(final double[] u, final double[] v, final int i) {
077 return u[i] - v[i];
078 }
079
080 @Override
081 public Comparator<double[]> dominance() {
082 return Pareto::dominance;
083 }
084
085 @Override
086 public int hashCode() {
087 return Arrays.hashCode(_data);
088 }
089
090 @Override
091 public boolean equals(final Object obj) {
092 return obj == this ||
093 obj instanceof SimpleDoubleVec other &&
094 Arrays.equals(other._data, _data);
095 }
096
097 @Override
098 public String toString() {
099 return Arrays.toString(_data);
100 }
101
102
103 /* *************************************************************************
104 * Java object serialization
105 * ************************************************************************/
106
107 @Serial
108 private Object writeReplace() {
109 return new SerialProxy(SerialProxy.SIMPLE_DOUBLE_VEC, this);
110 }
111
112 @Serial
113 private void readObject(final ObjectInputStream stream)
114 throws InvalidObjectException
115 {
116 throw new InvalidObjectException("Serialization proxy required.");
117 }
118
119 void write(final DataOutput out) throws IOException {
120 writeDoubleArray(_data,out);
121 }
122
123 static SimpleDoubleVec read(final DataInput in) throws IOException {
124 return new SimpleDoubleVec(readDoubleArray(in));
125 }
126 }
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