01 /*
02 * Java Genetic Algorithm Library (jenetics-7.1.2).
03 * Copyright (c) 2007-2023 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.util;
21
22 import static java.util.Objects.requireNonNull;
23
24 import java.util.Iterator;
25 import java.util.NoSuchElementException;
26 import java.util.function.IntFunction;
27
28 /**
29 * Helper class for iterating through given int range
30 *
31 * @param <T> the mapping data type
32 *
33 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
34 * @version 6.0
35 * @since 6.0
36 */
37 final class IntFunctionIterator<T> implements Iterator<T> {
38 private final IntFunction<? extends T> _mapper;
39 private final int _length;
40
41 private int _cursor = 0;
42
43 IntFunctionIterator(final IntFunction<? extends T> mapper, final int length) {
44 _mapper = requireNonNull(mapper);
45 _length = length;
46 }
47
48 @Override
49 public boolean hasNext() {
50 return _cursor != _length;
51 }
52
53 @Override
54 public T next() {
55 final int i = _cursor;
56 if (_cursor >= _length) {
57 throw new NoSuchElementException();
58 }
59
60 _cursor = i + 1;
61 return _mapper.apply(i);
62 }
63 }
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