/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999-2002 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) 1999, International
 * Business Machines, Inc., http://www.ibm.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
#if !defined(MUTABLENODEREFLIST_HEADER_GUARD_1357924680)
#define MUTABLENODEREFLIST_HEADER_GUARD_1357924680



// Base include file.  Must be first.
#include <xalanc/XPath/XPathDefinitions.hpp>



#include <xalanc/XPath/NodeRefList.hpp>



XALAN_CPP_NAMESPACE_BEGIN



class XPathExecutionContext;
class XalanDocument;
class XalanNodeList;



/**
 * Local implementation of MutableNodeRefList.  This class is for internal use
 * only.
 */
class XALAN_XPATH_EXPORT MutableNodeRefList : public NodeRefList
{
public:

	/**
	 * Construct an empty mutable node list.
	 */
	explicit
	MutableNodeRefList();

	/**
	 * Construct a mutable node list from another list.
	 * 
	 * @param theSource source list
	 */
	MutableNodeRefList(const MutableNodeRefList&	theSource);

	/**
	 * Construct a mutable node list from another list.
	 * 
	 * @param theSource  source list
	 */
	explicit
	MutableNodeRefList(const NodeRefListBase&	theSource);

	virtual
	~MutableNodeRefList();

	MutableNodeRefList&
	operator=(const MutableNodeRefList&		theRHS);

	MutableNodeRefList&
	operator=(const NodeRefList&		theRHS);

	MutableNodeRefList&
	operator=(const NodeRefListBase&	theRHS);

	MutableNodeRefList&
	operator=(const XalanNodeList*	theRHS);

	/**
	 * Add a node at to the list.
	 * 
	 * @param n node to add
	 */
	void
	addNode(XalanNode*	n);

	/**
	 * Insert a node at a given position.
	 * 
	 * @param n   node to insert
	 * @param pos position of insertion
	 */
	void
	insertNode(
			XalanNode*	n,
			size_type	pos);

	/**
	 * Remove a node from the list.
	 * 
	 * @param n   node to insert
	 */
	void
	removeNode(const XalanNode*		n);

	/**
	 * Remove a node from the list.
	 * 
	 * @param pos position of node in list
	 */
	void
	removeNode(size_type	pos);

	/**
	 * Remove all nodes.
	 */
	void
	clear();

	/**
	 * Set a item.
	 * 
	 * @param pos position of node to modify
	 * @param n   node to insert, default is empty node
	 */
	void
	setNode(
			size_type	pos,
			XalanNode*	n = 0);

	/**
	 * Copy NodeList members into this nodelist, adding in document order.  If
	 * a node is null, don't add it.
	 * 
	 * @param nodelist node list to add
	 */
	void
	addNodes(const XalanNodeList&	nodelist);

	/**
	 * Copy NodeList members into this nodelist, adding in document order.  If
	 * a node is null, don't add it.
	 * 
	 * @param nodelist node list to add
	 */
	void
	addNodes(const NodeRefListBase&		nodelist);

	/**
	 * Copy NodeList members into this nodelist, adding in document order.
	 * 
	 * @param nodelist node list to add
	 * @param executionContext the current execution context
	 */
	void
	addNodesInDocOrder(
			const XalanNodeList&	nodelist,
			XPathExecutionContext&	executionContext);
  
	/**
	 * Copy NodeList members into this nodelist, adding in document order.
	 * 
	 * @param nodelist node list to add
	 * @param executionContext the current execution context
	 */
	void
	addNodesInDocOrder(
			const NodeRefListBase&	nodelist,
			XPathExecutionContext&	executionContext);

	/**
	 * Copy NodeList members into this nodelist, adding in document order.
	 * 
	 * @param nodelist node list to add
	 * @param executionContext the current execution context
	 */
	void
	addNodesInDocOrder(
			const MutableNodeRefList&	nodelist,
			XPathExecutionContext&		executionContext);
  
	/**
	 * Add a node into list where it should occur in document order.
	 *
	 * @param node node object to add
	 * @param executionContext the current execution context
	 */
	void
	addNodeInDocOrder(
			XalanNode*				node,
			XPathExecutionContext&	executionContext);

	/**
	 * Clear any null entries in the node list.
	 */
	void
	clearNulls();

	/**
	 * Reverse the nodes in the list.
	 */
	void
	reverse();

	/**
	 * Assign the nodes in reverse order into the supplied instance.
	 *
	 * @param nodelist The target node list.
	 */
	void
	reverseAssign(MutableNodeRefList&	nodelist) const;

	/**
	 * Reserve space for the supplied number of nodes.
	 * This is taken as an optimization, and may be
	 * ignored.  You might want to call this when you
	 * know the number of nodes you're about to add to
	 * this list.
	 *
	 * Remember to take into account the current size of
	 * the list when calling this.  That means you will
	 * probably want to add the result of getLength() to
	 * the number of nodes you're planning to add.
	 *
	 * @param theCount the number of nodes to reserve space for
	 */
	void
	reserve(size_type	theCount)
	{
		m_nodeList.reserve(theCount);
	}

	/**
	 * See if the order of the nodes is an unknown order.
	 */
	bool
	getUnknownOrder() const
	{
		return m_order == eUnknownOrder ? true : false;
	}

	void
	setUnknownOrder()
	{
		m_order = eUnknownOrder;
	}

	/**
	 * See if the order of the nodes is document order.
	 */
	bool
	getDocumentOrder() const
	{
		return m_order == eDocumentOrder ? true : false;
	}

	/**
	 * Set the known order of the nodes.  This should
	 * only be done when the order is known. Otherwise,
	 * disaster will ensue.
	 */
	void
	setDocumentOrder()
	{
		m_order = eDocumentOrder;
	}

	/**
	 * See if the order of the nodes is reverse document order.
	 */
	bool
	getReverseDocumentOrder() const
	{
		return m_order == eReverseDocumentOrder ? true : false;
	}

	/**
	 * Set the known order of the nodes.  This should
	 * only be done when the order is known. Otherwise,
	 * disaster will ensue.
	 */
	void
	setReverseDocumentOrder()
	{
		m_order = eReverseDocumentOrder;
	}

	typedef NodeListVectorType::iterator	NodeListIteratorType;

	class addNodeInDocOrderFunctor
	{
	public:

		addNodeInDocOrderFunctor(
				MutableNodeRefList&		theList,
				XPathExecutionContext&	theExecutionContext) :
			m_list(theList),
			m_executionContext(theExecutionContext)
		{
		}

		void
		operator()(XalanNode*	theNode) const
		{
			m_list.addNodeInDocOrder(theNode, m_executionContext);
		}

	private:

		MutableNodeRefList&		m_list;

		XPathExecutionContext&	m_executionContext;
	};

	void
	swap(MutableNodeRefList&	theOther)
	{
		NodeRefList::swap(theOther);

		const eOrder	temp = m_order;

		m_order = theOther.m_order;

		theOther.m_order = temp;
	}

private:

	// An enum to determine what the order of the nodes is...
	enum eOrder { eUnknownOrder, eDocumentOrder, eReverseDocumentOrder };

	eOrder	m_order;
};



XALAN_CPP_NAMESPACE_END



#endif	// MUTABLENODEREFLIST_HEADER_GUARD_1357924680
