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Copy pathIxOrderedMergeIterable.java
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55 lines (45 loc) · 1.6 KB
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/*
* Copyright 2011-2016 David Karnok
*
* 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.
*/
package ix;
import java.util.*;
import ix.IxOrderedMergeArray.OrderedMergeIterator;
/**
* Merges an array of Iterable items by picking the smallest from them
* with the help of a Comparator.
*
* @param <T> the value type
*/
final class IxOrderedMergeIterable<T> extends Ix<T> {
final Iterable<? extends Iterable<? extends T>> sources;
final Comparator<? super T> comparator;
IxOrderedMergeIterable(Iterable<? extends Iterable<? extends T>> sources, Comparator<? super T> comparator) {
this.sources = sources;
this.comparator = comparator;
}
@Override
public Iterator<T> iterator() {
@SuppressWarnings("unchecked")
Iterator<? extends T>[] srcs = new Iterator[8];
int n = 0;
for (Iterable<? extends T> iter : sources) {
if (n == srcs.length) {
srcs = Arrays.copyOf(srcs, n + (n >> 2));
}
srcs[n++] = iter.iterator();
}
return new OrderedMergeIterator<T>(srcs, n, comparator);
}
}