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	/*
	* 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.xalan.internal.xsltc.runtime.AbstractTranslet;
	import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary;
	import com.sun.org.apache.xalan.internal.xsltc.util.IntegerArray;
	import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
	import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;

	/**
	* Iterators of this kind use a CurrentNodeListFilter to filter a subset of
	* nodes from a source iterator. For each node from the source, the boolean
	* method CurrentNodeListFilter.test() is called.
	*
	* All nodes from the source are read into an array upon calling setStartNode()
	* (this is needed to determine the value of last, a parameter to
	* CurrentNodeListFilter.test()). The method getLast() returns the last element
	* after applying the filter.
	* @author Jacek Ambroziak
	* @author Santiago Pericas-Geertsen
	* @author Morten Jorgensen
	*/

	public final class CurrentNodeListIterator extends DTMAxisIteratorBase {
	/**
	* A flag indicating if nodes are returned in document order.
	*/
	private boolean _docOrder;

	/**
	* The source for this iterator.
	*/
	private DTMAxisIterator _source;

	/**
	* A reference to a filter object.
	*/
	private final CurrentNodeListFilter _filter;

	/**
	* An integer array to store nodes from source iterator.
	*/
	private IntegerArray _nodes = new IntegerArray();

	/**
	* Index in _nodes of the next node to filter.
	*/
	private int _currentIndex;

	/**
	* The current node in the stylesheet at the time of evaluation.
	*/
	private final int _currentNode;

	/**
	* A reference to the translet.
	*/
	private AbstractTranslet _translet;

	public CurrentNodeListIterator(DTMAxisIterator source,
	CurrentNodeListFilter filter,
	int currentNode,
	AbstractTranslet translet)
	{
	this(source, !source.isReverse(), filter, currentNode, translet);
	}

	public CurrentNodeListIterator(DTMAxisIterator source, boolean docOrder,
	CurrentNodeListFilter filter,
	int currentNode,
	AbstractTranslet translet)
	{
	_source = source;
	_filter = filter;
	_translet = translet;
	_docOrder = docOrder;
	_currentNode = currentNode;
	}

	public DTMAxisIterator forceNaturalOrder() {
	_docOrder = true;
	return this;
	}

	public void setRestartable(boolean isRestartable) {
	_isRestartable = isRestartable;
	_source.setRestartable(isRestartable);
	}

	public boolean isReverse() {
	return !_docOrder;
	}

	public DTMAxisIterator cloneIterator() {
	try {
	final CurrentNodeListIterator clone =
	(CurrentNodeListIterator) super.clone();
	clone._nodes = (IntegerArray) _nodes.clone();
	clone._source = _source.cloneIterator();
	clone._isRestartable = false;
	return clone.reset();
	}
	catch (CloneNotSupportedException e) {
	BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
	e.toString());
	return null;
	}
	}

	public DTMAxisIterator reset() {
	_currentIndex = 0;
	return resetPosition();
	}

	public int next() {
	final int last = _nodes.cardinality();
	final int currentNode = _currentNode;
	final AbstractTranslet translet = _translet;

	for (int index = _currentIndex; index < last; ) {
	final int position = _docOrder ? index + 1 : last - index;
	final int node = _nodes.at(index++); // note increment

	if (_filter.test(node, position, last, currentNode, translet,
	this)) {
	_currentIndex = index;
	return returnNode(node);
	}
	}
	return END;
	}

	public DTMAxisIterator setStartNode(int node) {
	if (_isRestartable) {
	_source.setStartNode(_startNode = node);

	_nodes.clear();
	while ((node = _source.next()) != END) {
	_nodes.add(node);
	}
	_currentIndex = 0;
	resetPosition();
	}
	return this;
	}

	public int getLast() {
	if (_last == -1) {
	_last = computePositionOfLast();
	}
	return _last;
	}

	public void setMark() {
	_markedNode = _currentIndex;
	}

	public void gotoMark() {
	_currentIndex = _markedNode;
	}

	private int computePositionOfLast() {
	final int last = _nodes.cardinality();
	final int currNode = _currentNode;
	final AbstractTranslet translet = _translet;

	int lastPosition = _position;
	for (int index = _currentIndex; index < last; ) {
	final int position = _docOrder ? index + 1 : last - index;
	int nodeIndex = _nodes.at(index++); // note increment

	if (_filter.test(nodeIndex, position, last, currNode, translet,
	this)) {
	lastPosition++;
	}
	}
	return lastPosition;
	}
	}

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