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Copy pathIxBuffer.java
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70 lines (55 loc) · 1.68 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.*;
final class IxBuffer<T> extends IxSource<T, List<T>> {
final int size;
IxBuffer(Iterable<T> source, int size) {
super(source);
this.size = size;
}
@Override
public Iterator<List<T>> iterator() {
return new BufferIterator<T>(source.iterator(), size);
}
static final class BufferIterator<T> extends IxSourceIterator<T, List<T>> {
final int size;
BufferIterator(Iterator<T> it, int size) {
super(it);
this.size = size;
}
@Override
protected boolean moveNext() {
int s = size;
Iterator<T> it = this.it;
List<T> list = new ArrayList<T>();
while (s != 0 && it.hasNext()) {
list.add(it.next());
s--;
}
if (list.isEmpty()) {
done = true;
return false;
}
value = list;
hasValue = true;
if (s != 0) {
done = true;
}
return true;
}
}
}