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Copy pathIxBufferWhile.java
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111 lines (89 loc) · 2.78 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.*;
/**
* Buffer while the predicate returns true.
*
* @param <T> the value type
*/
final class IxBufferWhile<T> extends IxSource<T, List<T>> {
final IxPredicate<? super T> predicate;
IxBufferWhile(Iterable<T> source, IxPredicate<? super T> predicate) {
super(source);
this.predicate = predicate;
}
@Override
public Iterator<List<T>> iterator() {
return new BufferSplitIterator<T>(source.iterator(), predicate);
}
static final class BufferSplitIterator<T> implements Iterator<List<T>> {
final Iterator<T> source;
final IxPredicate<? super T> predicate;
boolean done;
List<T> buffer;
List<T> next;
BufferSplitIterator(Iterator<T> source, IxPredicate<? super T> predicate) {
this.source = source;
this.predicate = predicate;
}
@Override
public boolean hasNext() {
List<T> b = buffer;
if (b == null) {
if (done) {
return false;
}
b = next;
if (b == null) {
b = new ArrayList<T>();
}
Iterator<T> src = source;
while (src.hasNext()) {
T v = src.next();
if (!predicate.test(v)) {
buffer = b;
b = new ArrayList<T>();
b.add(v);
next = b;
return true;
}
b.add(v);
}
if (b.isEmpty()) {
done = true;
return false;
}
buffer = b;
done = true;
}
return true;
}
@Override
public List<T> next() {
if (hasNext()) {
List<T> b = buffer;
buffer = null;
return b;
}
throw new NoSuchElementException();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
}