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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
package net.sf.saxon.z;
import java.util.function.Supplier;
/**
* An iterator over nodes, that concatenates the nodes returned by two supplied iterators.
*/
public class ConcatenatingIntIterator implements IntIterator {
IntIterator first;
Supplier second;
IntIterator active;
/**
* Create an iterator that concatenates the results of two supplied iterator. The
* second iterator isn't created until it is actually needed.
* @param first the first iterator
* @param second a function that can be called to supply the second iterator
*/
public ConcatenatingIntIterator(IntIterator first, Supplier second) {
this.first = first;
this.second = second;
this.active = first;
}
@Override
public boolean hasNext() {
if (active.hasNext()) {
return true;
} else if (active == first) {
first = null;
active = second.get();
return active.hasNext();
} else {
return false;
}
}
/**
* Get the next item in the sequence.
* @return the next Item. If there are no more items, return null.
*/
/*@Nullable*/
@Override
public int next() {
return active.next();
}
}