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/*
* Java Genetic Algorithm Library (jenetics-8.1.0).
* Copyright (c) 2007-2024 Franz Wilhelmstötter
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Author:
* Franz Wilhelmstötter ([email protected])
*/
package io.jenetics.ext.internal.util;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Spliterator;
import java.util.function.Consumer;
import java.util.function.Supplier;
/**
* @author Franz Wilhelmstötter
* @version 4.1
* @since 4.1
*/
public class CyclicSpliterator implements Spliterator {
private final List>> _spliterators;
private ConcatSpliterator _concat = null;
public CyclicSpliterator(final List>> spliterators) {
spliterators.forEach(Objects::requireNonNull);
_spliterators = new ArrayList<>(spliterators);
}
@Override
public boolean tryAdvance(final Consumer action) {
boolean advance = true;
if (_spliterators.isEmpty()) {
advance = false;
} else {
if (!spliterator().tryAdvance(action)) {
_concat = null;
}
}
return advance;
}
@Override
public Spliterator trySplit() {
return new CyclicSpliterator<>(_spliterators);
}
@Override
public long estimateSize() {
return Long.MAX_VALUE;
}
@Override
public int characteristics() {
return Spliterator.ORDERED;
}
private ConcatSpliterator spliterator() {
if (_concat == null) {
_concat = new ConcatSpliterator<>(
_spliterators.stream()
.map(Supplier::get)
.toList()
);
}
return _concat;
}
}