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Copy pathIxTakeLast.java
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72 lines (59 loc) · 1.79 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.Iterator;
final class IxTakeLast<T> extends IxSource<T, T> {
final int n;
IxTakeLast(Iterable<T> source, int n) {
super(source);
this.n = n;
}
@Override
public Iterator<T> iterator() {
return new TakeLastIterator<T>(source.iterator(), n);
}
static final class TakeLastIterator<T> extends IxSourceQueuedIterator<T, T, T> {
int n;
TakeLastIterator(Iterator<T> it, int n) {
super(it);
this.n = n;
}
@Override
protected boolean moveNext() {
int n = this.n;
if (n != 0) {
Iterator<T> it = this.it;
while (it.hasNext()) {
if (n == 0) {
poll();
} else {
n--;
}
offer(toObject(it.next()));
}
this.n = n;
}
Object o = poll();
if (o != null) {
value = fromObject(o);
hasValue = true;
return true;
}
done = true;
return false;
}
}
}