01 /*
02 * Java Genetic Algorithm Library (jenetics-3.5.0).
03 * Copyright (c) 2007-2016 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@gmx.at)
19 */
20 package org.jenetics.engine;
21
22 import static java.util.Objects.requireNonNull;
23
24 import java.util.Iterator;
25 import java.util.function.Function;
26 import java.util.function.Supplier;
27
28 import org.jenetics.Gene;
29
30 /**
31 * @author <a href="mailto:franz.wilhelmstoetter@gmx.at">Franz Wilhelmstötter</a>
32 * @since 3.0
33 * @version 3.0
34 */
35 final class EvolutionIterator<
36 G extends Gene<?, G>,
37 C extends Comparable<? super C>
38 >
39 implements Iterator<EvolutionResult<G, C>>
40 {
41
42 private final Function<EvolutionStart<G, C>, EvolutionResult<G, C>> _evolution;
43 private final Supplier<EvolutionStart<G, C>> _initial;
44
45 private EvolutionStart<G, C> _start;
46
47 EvolutionIterator(
48 final Function<EvolutionStart<G, C>, EvolutionResult<G, C>> evolution,
49 final Supplier<EvolutionStart<G, C>> initial
50 ) {
51 _evolution = requireNonNull(evolution);
52 _initial = requireNonNull(initial);
53 }
54
55 @Override
56 public EvolutionResult<G, C> next() {
57 if (_start == null) {
58 _start = _initial.get();
59 }
60
61 final EvolutionResult<G, C> result = _evolution.apply(_start);
62 _start = result.next();
63 return result;
64 }
65
66 @Override
67 public boolean hasNext() {
68 return true;
69 }
70
71 }
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