/*
 * @(#)$Id$
 *
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Sun
 * Microsystems., http://www.sun.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 *
 */

package org.apache.xalan.xsltc.dom;

import org.apache.xalan.xsltc.DOM;
import org.apache.xalan.xsltc.Translet;
import org.apache.xml.dtm.DTMAxisIterator;

public abstract class SingleNodeCounter extends NodeCounter {
    static private final int[] EmptyArray = new int[] { };
    DTMAxisIterator _countSiblings = null;

    public SingleNodeCounter(Translet translet,
			     DOM document,
			     DTMAxisIterator iterator) {
	super(translet, document, iterator);
    }

    public NodeCounter setStartNode(int node) {
	_node = node;
	_nodeType = _document.getExpandedTypeID(node);
	_countSiblings = _document.getAxisIterator(PRECEDINGSIBLING);
	return this;
    }

    public String getCounter() {
	int result;
	if (_value != Integer.MIN_VALUE) {
	    result = _value;
	}
	else {
	    int next = _node;
	    result = 0;
	    if (!matchesCount(next)) {
		while ((next = _document.getParent(next)) > END) {
		    if (matchesCount(next)) {
			break;		// found target
		    }
		    if (matchesFrom(next)) {
			next = END;
			break;		// no target found
		    }
		}
	    }

	    if (next != END) {
		_countSiblings.setStartNode(next);
		do {
		    if (matchesCount(next)) result++;
		} while ((next = _countSiblings.next()) != END);
	    }
	    else {
		// If no target found then pass the empty list
		return formatNumbers(EmptyArray);
	    }
	}
	return formatNumbers(result);
    }

    public static NodeCounter getDefaultNodeCounter(Translet translet,
						    DOM document,
						    DTMAxisIterator iterator) {
	return new DefaultSingleNodeCounter(translet, document, iterator);
    }

    static class DefaultSingleNodeCounter extends SingleNodeCounter {
	public DefaultSingleNodeCounter(Translet translet,
					DOM document, DTMAxisIterator iterator) {
	    super(translet, document, iterator);
	}

	public NodeCounter setStartNode(int node) {
	    _node = node;
	    _nodeType = _document.getExpandedTypeID(node);
	    _countSiblings =
		_document.getTypedAxisIterator(PRECEDINGSIBLING,
					       _document.getExpandedTypeID(node));
	    return this;
	}

	public String getCounter() {
	    int result;
	    if (_value != Integer.MIN_VALUE) {
		result = _value;
	    }
	    else {
		int next;
		result = 1;
		_countSiblings.setStartNode(_node);
		while ((next = _countSiblings.next()) != END) {
		    result++;
		}
	    }
	    return formatNumbers(result);
	}
    }
}