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.Spliterator;
25 import java.util.function.Consumer;
26 import java.util.function.Function;
27 import java.util.function.Predicate;
28 import java.util.function.Supplier;
29
30 import org.jenetics.Gene;
31
32 /**
33 * @author <a href="mailto:franz.wilhelmstoetter@gmx.at">Franz Wilhelmstötter</a>
34 * @since 3.0
35 * @version 3.0
36 */
37 final class EvolutionSpliterator<
38 G extends Gene<?, G>,
39 C extends Comparable<? super C>
40 >
41 implements Spliterator<EvolutionResult<G, C>>
42 {
43
44 private final Supplier<EvolutionStart<G, C>> _initial;
45 private final Function<? super EvolutionStart<G, C>, EvolutionResult<G, C>> _evolution;
46 private final Predicate<? super EvolutionResult<G, C>> _proceed;
47
48 private EvolutionStart<G, C> _start;
49
50 EvolutionSpliterator(
51 final Supplier<EvolutionStart<G, C>> initial,
52 final Function<? super EvolutionStart<G, C>, EvolutionResult<G, C>> evolution,
53 final Predicate<? super EvolutionResult<G, C>> proceed
54 ) {
55 _evolution = requireNonNull(evolution);
56 _initial = requireNonNull(initial);
57 _proceed = requireNonNull(proceed);
58 }
59
60 @Override
61 public boolean tryAdvance(
62 final Consumer<? super EvolutionResult<G, C>> action
63 ) {
64 if (_start == null) {
65 _start = _initial.get();
66 }
67
68 final EvolutionResult<G, C> result = _evolution.apply(_start);
69 action.accept(result);
70 _start = result.next();
71
72 return _proceed.test(result);
73 }
74
75 @Override
76 public Spliterator<EvolutionResult<G, C>> trySplit() {
77 return null;
78 }
79
80 @Override
81 public long estimateSize() {
82 return Long.MAX_VALUE;
83 }
84
85 @Override
86 public int characteristics() {
87 return NONNULL | IMMUTABLE;
88 }
89 }
|