/*

 * 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;

import com.sun.org.apache.xalan.internal.xsltc.util.IntegerArray;

/**

 * CachedNodeListIterator is used for select expressions in a

 * variable or parameter. This iterator caches all nodes in an

 * IntegerArray. Its cloneIterator() method is overridden to

 * return an object of ClonedNodeListIterator.

 */

public final class CachedNodeListIterator extends DTMAxisIteratorBase {

    /**

     * Source for this iterator.

     */

    private DTMAxisIterator _source;

    private IntegerArray _nodes = new IntegerArray();

    private int _numCachedNodes = 0;

    private int _index = 0;

    private boolean _isEnded = false;

    public CachedNodeListIterator(DTMAxisIterator source) {

        _source = source;

    }

    public void setRestartable(boolean isRestartable) {

        //_isRestartable = isRestartable;

        //_source.setRestartable(isRestartable);

    }

    public DTMAxisIterator setStartNode(int node) {

        if (_isRestartable) {

            _startNode = node;

            _source.setStartNode(node);

            resetPosition();

            _isRestartable = false;

        }

        return this;

    }

    public int next() {

        return getNode(_index++);

    }

    public int getPosition() {

        return _index == 0 ? 1 : _index;

    }

    public int getNodeByPosition(int pos) {

        return getNode(pos);

    }

    public int getNode(int index) {

        if (index < _numCachedNodes) {

            return _nodes.at(index);

        }

        else if (!_isEnded){

            int node = _source.next();

            if (node != END) {

                _nodes.add(node);

                _numCachedNodes++;

            }

            else {

                _isEnded = true;

            }

            return node;

        }

        else

            return END;

    }

    public DTMAxisIterator cloneIterator() {

        ClonedNodeListIterator clone = new ClonedNodeListIterator(this);

        return clone;

    }

    public DTMAxisIterator reset() {

        _index = 0;

        return this;

    }

    public void setMark() {

        _source.setMark();

    }

    public void gotoMark() {

        _source.gotoMark();

    }

}