01 /*
02 * Java Genetic Algorithm Library (jenetics-4.2.0).
03 * Copyright (c) 2007-2018 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.prog;
21
22 import io.jenetics.ext.TreeGene;
23 import io.jenetics.ext.TreeMutator;
24 import io.jenetics.ext.util.TreeNode;
25
26 import io.jenetics.prog.op.MathExpr;
27 import io.jenetics.prog.op.Op;
28
29 /**
30 * Prunes a given mathematical tree with the given alterer probability.
31 *
32 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
33 * @version 4.1
34 * @since 4.1
35 */
36 public class MathTreePruneAlterer<
37 G extends TreeGene<Op<Double>, G>,
38 C extends Comparable<? super C>
39 >
40 extends TreeMutator<Op<Double>, G, C>
41 {
42
43 public MathTreePruneAlterer() {
44 this(DEFAULT_ALTER_PROBABILITY);
45 }
46
47 public MathTreePruneAlterer(double probability) {
48 super(probability);
49 }
50
51 @Override
52 protected void mutate(final TreeNode<Op<Double>> tree) {
53 MathExpr.prune(tree);
54 }
55
56 }
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