001 /*
002 * Java Genetic Algorithm Library (jenetics-5.0.0).
003 * Copyright (c) 2007-2019 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;
021
022 import static io.jenetics.internal.util.SerialIO.readInt;
023 import static io.jenetics.internal.util.SerialIO.writeInt;
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 import java.util.stream.DoubleStream;
032 import java.util.stream.IntStream;
033 import java.util.stream.Stream;
034
035 import io.jenetics.util.DoubleRange;
036 import io.jenetics.util.ISeq;
037 import io.jenetics.util.IntRange;
038 import io.jenetics.util.MSeq;
039
040 /**
041 * Numeric chromosome implementation which holds 64 bit floating point numbers.
042 *
043 * @see DoubleGene
044 *
045 * @implNote
046 * This class is immutable and thread-safe.
047 *
048 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
049 * @since 1.6
050 * @version 5.0
051 */
052 public class DoubleChromosome
053 extends AbstractBoundedChromosome<Double, DoubleGene>
054 implements
055 NumericChromosome<Double, DoubleGene>,
056 Serializable
057 {
058 private static final long serialVersionUID = 3L;
059
060 /**
061 * Create a new chromosome from the given {@code genes} and the allowed
062 * length range of the chromosome.
063 *
064 * @since 4.0
065 *
066 * @param genes the genes that form the chromosome.
067 * @param lengthRange the allowed length range of the chromosome
068 * @throws NullPointerException if one of the arguments is {@code null}.
069 * @throws IllegalArgumentException if the length of the gene sequence is
070 * empty, doesn't match with the allowed length range, the minimum
071 * or maximum of the range is smaller or equal zero or the given
072 * range size is zero.
073 */
074 protected DoubleChromosome(
075 final ISeq<DoubleGene> genes,
076 final IntRange lengthRange
077 ) {
078 super(genes, lengthRange);
079 }
080
081 @Override
082 public DoubleChromosome newInstance(final ISeq<DoubleGene> genes) {
083 return new DoubleChromosome(genes, lengthRange());
084 }
085
086 @Override
087 public DoubleChromosome newInstance() {
088 return of(_min, _max, lengthRange());
089 }
090
091 /**
092 * Returns a sequential stream of the alleles with this chromosome as its
093 * source.
094 *
095 * @since 4.3
096 *
097 * @return a sequential stream of alleles
098 */
099 public DoubleStream doubleStream() {
100 return IntStream.range(0, length()).mapToDouble(this::doubleValue);
101 }
102
103 /**
104 * Returns an double array containing all of the elements in this chromosome
105 * in proper sequence. If the chromosome fits in the specified array, it is
106 * returned therein. Otherwise, a new array is allocated with the length of
107 * this chromosome.
108 *
109 * @since 3.0
110 *
111 * @param array the array into which the elements of this chromosomes are to
112 * be stored, if it is big enough; otherwise, a new array is
113 * allocated for this purpose.
114 * @return an array containing the elements of this chromosome
115 * @throws NullPointerException if the given {@code array} is {@code null}
116 */
117 public double[] toArray(final double[] array) {
118 final double[] a = array.length >= length() ? array : new double[length()];
119 for (int i = length(); --i >= 0;) {
120 a[i] = doubleValue(i);
121 }
122
123 return a;
124 }
125
126 /**
127 * Returns an double array containing all of the elements in this chromosome
128 * in proper sequence.
129 *
130 * @since 3.0
131 *
132 * @return an array containing the elements of this chromosome
133 */
134 public double[] toArray() {
135 return toArray(new double[length()]);
136 }
137
138
139 /* *************************************************************************
140 * Static factory methods.
141 * ************************************************************************/
142
143 /**
144 * Create a new {@code DoubleChromosome} with the given genes.
145 *
146 * @param genes the genes of the chromosome.
147 * @return a new chromosome with the given genes.
148 * @throws IllegalArgumentException if the length of the genes array is
149 * empty or the given {@code genes} doesn't have the same range.
150 */
151 public static DoubleChromosome of(final DoubleGene... genes) {
152 checkGeneRange(Stream.of(genes).map(DoubleGene::range));
153 return new DoubleChromosome(ISeq.of(genes), IntRange.of(genes.length));
154 }
155
156 /**
157 * Create a new {@code DoubleChromosome} with the given genes.
158 *
159 * @since 4.3
160 *
161 * @param genes the genes of the chromosome.
162 * @return a new chromosome with the given genes.
163 * @throws NullPointerException if the given {@code genes} are {@code null}
164 * @throws IllegalArgumentException if the of the genes iterable is empty or
165 * the given {@code genes} doesn't have the same range.
166 */
167 public static DoubleChromosome of(final Iterable<DoubleGene> genes) {
168 final ISeq<DoubleGene> values = ISeq.of(genes);
169 checkGeneRange(values.stream().map(DoubleGene::range));
170 return new DoubleChromosome(values, IntRange.of(values.length()));
171 }
172
173 /**
174 * Create a new random chromosome.
175 *
176 * @since 4.0
177 *
178 * @param min the min value of the {@link DoubleGene}s (inclusively).
179 * @param max the max value of the {@link DoubleGene}s (exclusively).
180 * @param lengthRange the allowed length range of the chromosome.
181 * @return a new {@code DoubleChromosome} with the given parameter
182 * @throws IllegalArgumentException if the length of the gene sequence is
183 * empty, doesn't match with the allowed length range, the minimum
184 * or maximum of the range is smaller or equal zero or the given
185 * range size is zero.
186 * @throws NullPointerException if the given {@code lengthRange} is
187 * {@code null}
188 */
189 public static DoubleChromosome of(
190 final double min,
191 final double max,
192 final IntRange lengthRange
193 ) {
194 final ISeq<DoubleGene> genes = DoubleGene.seq(min, max, lengthRange);
195 return new DoubleChromosome(genes, lengthRange);
196 }
197
198 /**
199 * Create a new random {@code DoubleChromosome}.
200 *
201 * @param min the min value of the {@link DoubleGene}s (inclusively).
202 * @param max the max value of the {@link DoubleGene}s (exclusively).
203 * @param length the length of the chromosome.
204 * @return a new {@code DoubleChromosome} with the given parameter
205 * @throws IllegalArgumentException if the {@code length} is smaller than
206 * one.
207 */
208 public static DoubleChromosome of(
209 final double min,
210 final double max,
211 final int length
212 ) {
213 return of(min, max, IntRange.of(length));
214 }
215
216 /**
217 * Create a new random chromosome.
218 *
219 * @since 4.0
220 *
221 * @param range the integer range of the chromosome.
222 * @param lengthRange the allowed length range of the chromosome.
223 * @return a new {@code DoubleChromosome} with the given parameter
224 * @throws IllegalArgumentException if the length of the gene sequence is
225 * empty, doesn't match with the allowed length range, the minimum
226 * or maximum of the range is smaller or equal zero or the given
227 * range size is zero.
228 * @throws NullPointerException if the given {@code lengthRange} is
229 * {@code null}
230 */
231 public static DoubleChromosome of(
232 final DoubleRange range,
233 final IntRange lengthRange
234 ) {
235 return of(range.getMin(), range.getMax(), lengthRange);
236 }
237
238 /**
239 * Create a new random {@code DoubleChromosome}.
240 *
241 * @since 3.2
242 *
243 * @param range the integer range of the chromosome.
244 * @param length the length of the chromosome.
245 * @return a new random {@code DoubleChromosome}
246 * @throws NullPointerException if the given {@code range} is {@code null}
247 * @throws IllegalArgumentException if the {@code length} is smaller than
248 * one.
249 */
250 public static DoubleChromosome of(final DoubleRange range, final int length) {
251 return of(range.getMin(), range.getMax(), length);
252 }
253
254 /**
255 * Create a new random {@code DoubleChromosome} of length one.
256 *
257 * @param min the minimal value of this chromosome (inclusively).
258 * @param max the maximal value of this chromosome (exclusively).
259 * @return a new {@code DoubleChromosome} with the given parameter
260 */
261 public static DoubleChromosome of(final double min, final double max) {
262 return of(min, max, 1);
263 }
264
265 /**
266 * Create a new random {@code DoubleChromosome} of length one.
267 *
268 * @since 3.2
269 *
270 * @param range the double range of the chromosome.
271 * @return a new random {@code DoubleChromosome} of length one
272 * @throws NullPointerException if the given {@code range} is {@code null}
273 */
274 public static DoubleChromosome of(final DoubleRange range) {
275 return of(range.getMin(), range.getMax());
276 }
277
278
279 /* *************************************************************************
280 * Java object serialization
281 * ************************************************************************/
282
283 private Object writeReplace() {
284 return new Serial(Serial.DOUBLE_CHROMOSOME, this);
285 }
286
287 private void readObject(final ObjectInputStream stream)
288 throws InvalidObjectException
289 {
290 throw new InvalidObjectException("Serialization proxy required.");
291 }
292
293 void write(final DataOutput out) throws IOException {
294 writeInt(length(), out);
295 writeInt(lengthRange().getMin(), out);
296 writeInt(lengthRange().getMax(), out);
297 out.writeDouble(_min);
298 out.writeDouble(_max);
299
300 for (int i = 0, n = length(); i < n; ++i) {
301 out.writeDouble(doubleValue(i));
302 }
303 }
304
305 static DoubleChromosome read(final DataInput in) throws IOException {
306 final int length = readInt(in);
307 final IntRange lengthRange = IntRange.of(readInt(in), readInt(in));
308 final double min = in.readDouble();
309 final double max = in.readDouble();
310
311 final MSeq<DoubleGene> values = MSeq.ofLength(length);
312 for (int i = 0; i < length; ++i) {
313 values.set(i, DoubleGene.of(in.readDouble(), min, max));
314 }
315
316 return new DoubleChromosome(values.toISeq(), lengthRange);
317 }
318
319 }
|