usx.USXList

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//=============================================================================
// Unreal Script Extensions
// Class: USXList
// Description: Simple list class, for USXListElems
//
// Author: Markus Nuebel
//=============================================================================
class USXList extends Object;

var USXListElem	m_oHead; // Private: Head of list
var USXListElem	m_oTail; // Private: Tail of list
var int			m_nSize; // Private: Size of list

// Initializes the list
function init()
{
	m_oHead	= None;
	m_oTail	= None;
	m_nSize	= 0;
}

// Tests, wheather the list is empty
function bool isEmpty()
{
	return (m_nSize==0);
}

// Retrieves the list size
function int getSize()
{
	return m_nSize;
}

// Inserts a new USX List elment to the list
function insert(USXListElem oNew)
{
	// Set the index of the new element
	oNew.m_nPos	= m_nSize;

	// Check for empty list
	if(isEmpty())
	{
		m_oHead	= oNew;
		m_oTail	= oNew;
	}
	else
	{
		// Append to tail
		m_oTail.m_oNext	= oNew;			
		oNew.m_oNext	= None;			
		oNew.m_oPrev	= m_oTail;
		m_oTail			= oNew;
	}
	m_nSize++;
}

// Removes the head of the list
function USXListElem remove()
{
	local USXListElem	oResult;
	local USXListElem	oNewHead;

	// Check for empty list fist
	if(isEmpty())
		return None;
	// Check for single element list
	if(m_nSize == 1)
	{
		oResult	= m_oHead;
		m_oHead	= None;
		m_oTail	= None;
	}
	else
	{
		oNewHead			= m_oHead.m_oNext;
		oNewHead.m_oPrev	= None;
		m_oHead.m_oNext		= None;
		m_oHead				= oNewHead;
	}

	m_nSize--;
	return oResult;
}

// Tests, if an element is already contained in the list
function bool isContained(USXListElem oTarget)
{
	local USXListElem	oRunner;

	// Check simple case first
	if(isEmpty())
		return false;

	oRunner = m_oHead;
	while(None != oRunner)
	{
		if(oRunner.isEqual(oTarget))
			return true;
		else
			oRunner = oRunner.m_oNext;
	}

	return false;
}

// Removes all element from the list
function removeAll()
{
	local USXListElem	oOldTail;
	while(!isEmpty())
	{
		// Save referenct to tail first
		oOldTail			= m_oTail;

		m_oTail				= m_oTail.m_oPrev;
		oOldTail.m_oPrev	= None;
		
		// Check if we already have removed th last item
		if(None	!= m_oTail)
			m_oTail.m_oNext		= None;
	}
}

defaultproperties
{
}

class file time: 12/7/2003 3:58:28 PM - creation time: 12/7/2003 4:03:46 PM
Created with UnCodeX