/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You 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 com.sun.org.apache.xalan.internal.xsltc.dom;

import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;

import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;

/**

 * @author Jacek Ambroziak

 * @author Santiago Pericas-Geertsen

 */

public class SingletonIterator extends DTMAxisIteratorBase {

    private int _node;

    private final boolean _isConstant;

    public SingletonIterator() {

        this(Integer.MIN_VALUE, false);

    }

    public SingletonIterator(int node) {

        this(node, false);

    }

    public SingletonIterator(int node, boolean constant) {

        _node = _startNode = node;

        _isConstant = constant;

    }

    /**

     * Override the value of <tt>_node</tt> only when this

     * object was constructed using the empty constructor.

     */

    public DTMAxisIterator setStartNode(int node) {

        if (_isConstant) {

            _node = _startNode;

            return resetPosition();

        }

        else if (_isRestartable) {

            if (_node <= 0)

                _node = _startNode = node;

            return resetPosition();

        }

        return this;

    }

    public DTMAxisIterator reset() {

        if (_isConstant) {

            _node = _startNode;

            return resetPosition();

        }

        else {

            final boolean temp = _isRestartable;

            _isRestartable = true;

            setStartNode(_startNode);

            _isRestartable = temp;

        }

        return this;

    }

    public int next() {

        final int result = _node;

        _node = DTMAxisIterator.END;

        return returnNode(result);

    }

    public void setMark() {

        _markedNode = _node;

    }

    public void gotoMark() {

        _node = _markedNode;

    }

}