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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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/*
 * $Id: NthIterator.java,v 1.10 2010-11-01 04:34:25 joehw Exp $
 */
package com.sun.org.apache.xalan.internal.xsltc.dom;

import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;

/**
 * @author Jacek Ambroziak
 * @author Morten Jorgensen
 */
public final class NthIterator extends DTMAxisIteratorBase {
    // ...[N]
    private DTMAxisIterator _source;
    private final int _position;
    private boolean _ready;

    public NthIterator(DTMAxisIterator source, int n) {
	_source = source;
	_position = n;
    }

    public void setRestartable(boolean isRestartable) {
	_isRestartable = isRestartable;
	_source.setRestartable(isRestartable);
    }
    
    public DTMAxisIterator cloneIterator() {
	try {
	    final NthIterator clone = (NthIterator) super.clone();
	    clone._source = _source.cloneIterator();	// resets source
	    clone._isRestartable = false;
	    return clone;
	}
	catch (CloneNotSupportedException e) {
	    BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
				      e.toString());
	    return null;
	}
    }

    public int next() {
	if (_ready) {
	    _ready = false;
	    return _source.getNodeByPosition(_position);
	}
	return DTMAxisIterator.END;
	/*
	if (_ready && _position > 0) {
            final int pos = _source.isReverse()
                                       ? _source.getLast() - _position + 1
                                       : _position;

	    _ready = false;
	    int node;
	    while ((node = _source.next()) != DTMAxisIterator.END) {
		if (pos == _source.getPosition()) {
		    return node;
		}
	    }
	}
	return DTMAxisIterator.END;
	*/
    }

    public DTMAxisIterator setStartNode(final int node) {
	if (_isRestartable) {
	    _source.setStartNode(node);
	    _ready = true;
	}
	return this;
    }
	
    public DTMAxisIterator reset() {
	_source.reset();
	_ready = true;
	return this;
    }
    
    public int getLast() {
	return 1;
    }
    
    public int getPosition() {
	return 1;
    }
    
    public void setMark() {
	_source.setMark();
    }
    
    public void gotoMark() {
	_source.gotoMark();
    }
}