001 /*
002 * Java Genetic Algorithm Library (jenetics-6.1.0).
003 * Copyright (c) 2007-2020 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.prog;
021
022 import io.jenetics.ext.TreeGene;
023 import io.jenetics.ext.TreeRewriteAlterer;
024 import io.jenetics.ext.rewriting.TreeRewriter;
025
026 import io.jenetics.prog.op.MathExpr;
027 import io.jenetics.prog.op.Op;
028
029 /**
030 * Prunes a given mathematical tree with the given alterer probability.
031 *
032 * @see TreeRewriteAlterer
033 *
034 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
035 * @version 5.0
036 * @since 4.1
037 */
038 public class MathRewriteAlterer<
039 G extends TreeGene<Op<Double>, G>,
040 C extends Comparable<? super C>
041 >
042 extends TreeRewriteAlterer<Op<Double>, G, C>
043 {
044
045 /**
046 * Create a new alterer with the given {@code rewriter} and given rewrite
047 * {@code limit}.
048 *
049 * @param rewriter the tree rewriter
050 * @param limit the rewriting limit
051 * @param probability the altering probability
052 * @throws NullPointerException if the {@code rewriter} is {@code null}
053 */
054 public MathRewriteAlterer(
055 final TreeRewriter<Op<Double>> rewriter,
056 final int limit,
057 final double probability
058 ) {
059 super(rewriter, limit, probability);
060 }
061
062 /**
063 * Create a new alterer with the given {@code rewriter} and given rewrite
064 * {@code limit}.
065 *
066 * @param rewriter the tree rewriter
067 * @param probability the altering probability
068 * @throws NullPointerException if the {@code rewriter} is {@code null}
069 */
070 public MathRewriteAlterer(
071 final TreeRewriter<Op<Double>> rewriter,
072 final double probability
073 ) {
074 this(rewriter, Integer.MAX_VALUE, probability);
075 }
076
077 /**
078 * Create a new alterer with the given {@code rewriter}.
079 *
080 * @param rewriter the tree rewriter
081 * @throws NullPointerException if the {@code rewriter} is {@code null}
082 */
083 public MathRewriteAlterer(final TreeRewriter<Op<Double>> rewriter) {
084 this(rewriter, Integer.MAX_VALUE, DEFAULT_ALTER_PROBABILITY);
085 }
086
087 /**
088 * Create a new alterer with the default math rewriter
089 * {@link MathExpr#REWRITER} and given rewrite.
090 *
091 * @param probability the altering probability
092 */
093 public MathRewriteAlterer(final double probability) {
094 this(MathExpr.REWRITER, Integer.MAX_VALUE, probability);
095 }
096
097 /**
098 * Create a new alterer with the default math rewriter
099 * {@link MathExpr#REWRITER} and given rewrite.
100 */
101 public MathRewriteAlterer() {
102 this(MathExpr.REWRITER, Integer.MAX_VALUE, DEFAULT_ALTER_PROBABILITY);
103 }
104
105 }
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