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Copy pathIxAggregate.java
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63 lines (51 loc) · 1.74 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 IxAggregate<T> extends IxSource<T, T> {
final IxFunction2<T, T, T> aggregator;
IxAggregate(Iterable<T> source, IxFunction2<T, T, T> aggregator) {
super(source);
this.aggregator = aggregator;
}
@Override
public Iterator<T> iterator() {
return new AggregateIterator<T>(source.iterator(), aggregator);
}
static final class AggregateIterator<T> extends IxSourceIterator<T, T> {
final IxFunction2<T, T, T> aggregator;
AggregateIterator(Iterator<T> it, IxFunction2<T, T, T> aggregator) {
super(it);
this.aggregator = aggregator;
}
@Override
protected boolean moveNext() {
Iterator<T> it = this.it;
IxFunction2<T, T, T> f = aggregator;
if (it.hasNext()) {
T acc = it.next();
while (it.hasNext()) {
acc = f.apply(acc, it.next());
}
value = acc;
hasValue = true;
done = true;
return true;
}
return false;
}
}
}