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Copy pathIxFlattenArrayIterable.java
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88 lines (69 loc) · 2.29 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 IxFlattenArrayIterable<T> extends Ix<T> {
final Iterable<T>[] sources;
IxFlattenArrayIterable(Iterable<T>[] sources) {
this.sources = sources;
}
@Override
public Iterator<T> iterator() {
return new FlattenIterator<T>(sources);
}
static final class FlattenIterator<T> extends IxBaseIterator<T> {
final Iterable<T>[] sources;
Iterator<? extends T> current;
int index;
FlattenIterator(Iterable<T>[] sources) {
this.sources = sources;
}
@SuppressWarnings("unchecked")
@Override
protected boolean moveNext() {
Iterator<? extends T> c = current;
while (c == null) {
int i = index;
if (i != sources.length) {
Iterable<? extends T> inner = sources[i];
index = i + 1;
if (inner instanceof Callable) {
value = checkedCall(((Callable<T>)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;
}
}
}