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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2023 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.jiter;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* An iterator over a pair of objects (typically sub-expressions of an expression)
*/
public class PairIterator implements Iterator {
private final T one;
private final T two;
private int pos = 0;
/**
* Create an iterator over two objects
*
* @param one the first object to be returned
* @param two the second object to be returned
*/
public PairIterator(T one, T two) {
this.one = one;
this.two = two;
}
/**
* Returns true if the iteration has more elements. (In other
* words, returns true if next would return an element
* rather than throwing an exception.)
*
* @return true if the iterator has more elements.
*/
@Override
public boolean hasNext() {
return pos < 2;
}
/**
* Returns the next element in the iteration.
*
* @return the next element in the iteration.
* @throws NoSuchElementException iteration has no more elements.
*/
@Override
public T next() {
switch (pos++) {
case 0:
return one;
case 1:
return two;
default:
throw new NoSuchElementException();
}
}
}