01 /*
02 * Java Genetic Algorithm Library (jenetics-6.3.0).
03 * Copyright (c) 2007-2021 Franz Wilhelmstötter
04 *
05 * Licensed under the Apache License, Version 2.0 (the "License");
06 * you may not use this file except in compliance with the License.
07 * You may obtain a copy of the License at
08 *
09 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 * Author:
18 * Franz Wilhelmstötter (franz.wilhelmstoetter@gmail.com)
19 */
20 package io.jenetics.ext;
21
22 import io.jenetics.Chromosome;
23
24 /**
25 * Chromosome for tree shaped genes.
26 *
27 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
28 * @version 6.0
29 * @since 3.9
30 */
31 public interface TreeChromosome<A, G extends TreeGene<A, G>>
32 extends Chromosome<G>
33 {
34
35 /**
36 * Return the root gene of this chromosome. Since the gene type is also a
37 * {@link io.jenetics.ext.util.Tree}, you are able to assign it to one.
38 * <pre>{@code
39 * final Tree<A, ?> t1 = root();
40 * final Tree<?, ?> t2 = root();
41 * }</pre>
42 * This method is also an alias for {@link #gene()}, which returns the
43 * first gene of the chromosome.
44 *
45 * @see #gene()
46 *
47 * @return the root tree gene of this chromosome
48 */
49 default G root() {
50 return gene();
51 }
52
53 }
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