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/*
Copyright (C) 2000 by David Durant
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "cssysdef.h"
#include "csutil/csdllist.h"
csDLinkList::csDLinkList()
{
firstItem = NULL;
currentItem = NULL;
}
csDLinkList::~csDLinkList()
{
csDLListItem *nextItem;
if (firstItem == NULL)
return;
currentItem = firstItem->nextItem;
while (currentItem != firstItem)
{
nextItem = currentItem->nextItem;
delete currentItem;
currentItem = nextItem;
}
delete firstItem;
}
void csDLinkList::RemoveItem(void *theObj)
{
currentItem = FindListItem(theObj);
RemoveItem();
}
csDLListItem * csDLinkList::FindListItem(void *anObj)
{
csDLListItem *listItemPtr;
listItemPtr = firstItem;
if (firstItem == NULL)
return NULL;
if (anObj == listItemPtr->theObject)
return listItemPtr;
while ((listItemPtr = listItemPtr->nextItem) != firstItem)
{
if (anObj == listItemPtr->theObject)
return listItemPtr;
}
return NULL;
}
void * csDLinkList::SetCurrentItem(void *theObj)
{
csDLListItem *it = FindListItem (theObj);
if (it)
{
currentItem = it;
return currentItem;
}
else
return NULL;
}
bool csDLinkList::AddItem(void *theObj)
{
csDLListItem *newItem;
newItem = new csDLListItem;
if (!newItem)
return false;
newItem->theObject = theObj;
if (firstItem == NULL)
{
// this is the first object in the list...
firstItem = newItem;
currentItem = newItem;
newItem->prevItem = newItem;
newItem->nextItem = newItem;
}
else
{
// this is NOT the first object in the list...
newItem->prevItem = firstItem->prevItem;
newItem->nextItem = firstItem;
firstItem->prevItem->nextItem = newItem;
firstItem->prevItem = newItem;
}
return true;
}
bool csDLinkList::AddCurrentItem(void *theObj)
{
csDLListItem *newItem;
if(!currentItem || !firstItem) return false;
newItem = new csDLListItem;
if (!newItem)
return false;
newItem->theObject = theObj;
newItem->nextItem = currentItem->nextItem;
currentItem->nextItem = newItem;
newItem->prevItem = currentItem;
newItem->nextItem->prevItem = newItem;
return true;
}
void csDLinkList::RemoveItem()
{
if (!currentItem)
return;
if (currentItem->nextItem == currentItem)
{
// this is the last object in the list
firstItem = NULL;
currentItem = NULL;
delete currentItem;
}
else
{
// this is NOT the last object in the list
csDLListItem *deadItem;
deadItem = currentItem;
currentItem->nextItem->prevItem = currentItem->prevItem;
currentItem->prevItem->nextItem = currentItem->nextItem;
if (firstItem == currentItem)
firstItem = currentItem->nextItem;
currentItem = currentItem->nextItem;
delete deadItem;
}
}
void * csDLinkList::GetFirstItem()
{
if (!currentItem)
return NULL;
currentItem = firstItem;
return currentItem->theObject;
}
void * csDLinkList::PeekFirstItem()
{
if (!firstItem)
return NULL;
return firstItem->theObject;
}
void * csDLinkList::GetPrevItem()
{
if (!currentItem)
return NULL;
currentItem = currentItem->prevItem;
return currentItem->theObject;
}
void * csDLinkList::GetNextItem()
{
if (!currentItem)
return NULL;
currentItem = currentItem->nextItem;
return currentItem->theObject;
}
void * csDLinkList::GetCurrentItem()
{
if (!currentItem)
return NULL;
return currentItem->theObject;
}
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