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Copy pathIxFlattenIterable.java
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90 lines (72 loc) · 2.65 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;
import java.util.concurrent.Callable;
final class IxFlattenIterable<T, R> extends IxSource<T, R> {
final IxFunction<? super T, ? extends Iterable<? extends R>> mapper;
IxFlattenIterable(Iterable<T> source, IxFunction<? super T, ? extends Iterable<? extends R>> mapper) {
super(source);
this.mapper = mapper;
}
@SuppressWarnings("unchecked")
@Override
public Iterator<R> iterator() {
if (source instanceof Callable) {
return (Iterator<R>)(mapper.apply(checkedCall((Callable<T>)source)).iterator());
}
return new FlattenIterator<T, R>(source.iterator(), mapper);
}
static final class FlattenIterator<T, R> extends IxSourceIterator<T, R> {
final IxFunction<? super T, ? extends Iterable<? extends R>> mapper;
Iterator<? extends R> current;
FlattenIterator(Iterator<T> it, IxFunction<? super T, ? extends Iterable<? extends R>> mapper) {
super(it);
this.mapper = mapper;
}
@SuppressWarnings("unchecked")
@Override
protected boolean moveNext() {
Iterator<? extends R> c = current;
while (c == null) {
if (it.hasNext()) {
Iterable<? extends R> inner = mapper.apply(it.next());
if (inner instanceof Callable) {
value = checkedCall((Callable<R>)inner);
hasValue = true;
return true;
}
c = inner.iterator();
if (c.hasNext()) {
current = c;
break;
} else {
c = null;
}
} else {
done = true;
return false;
}
}
value = c.next();
hasValue = true;
if (!c.hasNext()) {
current = null;
}
return true;
}
}
}