////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018 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.expr;

import net.sf.saxon.om.Item;

/**
 * MappingFunction is an interface that must be satisfied by an object passed to a
 * MappingIterator. StatefulMappingFunction is a sub-interface representing a mapping
 * function that maintains state information, and which must therefore be cloned
 * when the mapping iterator is cloned.
 */

public interface StatefulMappingFunction<F extends Item, T extends Item> {

    /**
     * Return a clone of this MappingFunction, with the state reset to its state at the beginning
     * of the underlying iteration
     *
     * @return a clone of this MappingFunction
     */

    StatefulMappingFunction<F, T> getAnother();

}

