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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.tree.iter;
import net.sf.saxon.om.NodeInfo;
/**
* An iterator over nodes, that concatenates the nodes returned by two supplied iterators.
*/
public class ConcatenatingAxisIterator implements AxisIterator {
AxisIterator first;
AxisIterator second;
AxisIterator active;
public ConcatenatingAxisIterator(AxisIterator first, AxisIterator second) {
this.first = first;
this.second = second;
this.active = first;
}
/**
* Get the next item in the sequence.
*
* @return the next Item. If there are no more nodes, return null.
*/
/*@Nullable*/
@Override
public NodeInfo next() {
NodeInfo n = active.next();
if (n == null && active == first) {
active = second;
n = second.next();
}
return n;
}
@Override
public void close() {
first.close();
second.close();
}
}