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/* xblnklst.h
XBase64 Software Library
Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
Email Contact:
XDB-devel@lists.sourceforge.net
XDB-users@lists.sourceforge.net
*/
#ifndef __XB_XBLNKLST_H__
#define __XB_XBLNKLST_H__
#ifdef XB_LINKLIST_SUPPORT
namespace xb{
template<class xbNodeType>
class XBDLLEXPORT xbLinkList {
public:
xbLinkList();
~xbLinkList();
xbLinkListNode<xbNodeType> *GetHeadNode() const;
xbLinkListNode<xbNodeType> *GetEndNode() const;
xbLinkListNode<xbNodeType> *GetNodeForNo( xbUInt32 ulNodeNo ) const;
void Clear();
xbUInt32 GetNodeCnt () const;
xbInt16 InsertAtEnd ( const xbNodeType &xbLLN );
xbInt16 InsertAtFront ( const xbNodeType &xbLLN );
xbInt16 RemoveByVal ( const xbNodeType &xbLLN );
xbInt16 RemoveFromEnd ();
xbInt16 RemoveFromEnd ( xbNodeType &xbLLN );
xbInt16 RemoveFromFront( xbNodeType &xbLLN );
xbInt16 SearchFor ( const xbNodeType &xbLLN );
private:
xbUInt32 ulNodeCnt;
xbLinkListNode<xbNodeType> *llStartPtr;
xbLinkListNode<xbNodeType> *llEndPtr;
};
template<class xbNodeType>
xbLinkList<xbNodeType>::xbLinkList(){
ulNodeCnt = 0;
llStartPtr = NULL;
llEndPtr = NULL;
}
template<class xbNodeType>
xbLinkList<xbNodeType>::~xbLinkList(){
Clear();
}
template<class xbNodeType>
void xbLinkList<xbNodeType>::Clear(){
xbLinkListNode<xbNodeType> *cPtr = llStartPtr, *tPtr;
for( xbUInt32 i = 0; i < ulNodeCnt; i++ ){
tPtr = cPtr;
cPtr = cPtr->GetNextNode();
delete tPtr;
}
ulNodeCnt = 0;
llStartPtr = NULL;
llEndPtr = NULL;
}
template<class xbNodeType>
xbLinkListNode<xbNodeType> *xbLinkList<xbNodeType>::GetHeadNode() const{
return llStartPtr;
}
template<class xbNodeType>
xbLinkListNode<xbNodeType> *xbLinkList<xbNodeType>::GetEndNode() const{
return llEndPtr;
}
template<class xbNodeType>
xbLinkListNode<xbNodeType> *xbLinkList<xbNodeType>::GetNodeForNo( xbUInt32 ulNo ) const{
xbLinkListNode<xbNodeType> *cPtr = llStartPtr;
xbUInt32 i;
for( i = 0; i < ulNo && i < ulNodeCnt; i++ )
cPtr = cPtr->GetNextNode();
if( i == ulNo )
return cPtr;
else
return 0;
}
template<class xbNodeType>
xbUInt32 xbLinkList<xbNodeType>::GetNodeCnt() const{
return ulNodeCnt;
}
template<class xbNodeType>
xbInt16 xbLinkList<xbNodeType>::InsertAtFront( const xbNodeType & ntKey ){
xbLinkListNode<xbNodeType> *p = new xbLinkListNode<xbNodeType>( ntKey );
if( p == 0 )
return XB_NO_MEMORY;
if( ulNodeCnt > 0 ){
llStartPtr->SetPrevNode( p );
p->SetNextNode( llStartPtr );
} else {
llEndPtr = p;
}
llStartPtr = p;
ulNodeCnt++;
return XB_NO_ERROR;
}
template<class xbNodeType>
xbInt16 xbLinkList<xbNodeType>::InsertAtEnd( const xbNodeType & ntKey ){
xbLinkListNode<xbNodeType> *p = new xbLinkListNode<xbNodeType>( ntKey );
if( p == 0 )
return XB_NO_MEMORY;
if( ulNodeCnt > 0 ){
llEndPtr->SetNextNode( p );
p->SetPrevNode( llEndPtr );
llEndPtr = p;
} else {
llStartPtr = p;
}
llEndPtr = p;
ulNodeCnt++;
return XB_NO_ERROR;
}
template<class xbNodeType>
xbInt16 xbLinkList<xbNodeType>::RemoveByVal( const xbNodeType & ntKey ){
// Remove the first instance of ntKey from the node chain
xbLinkListNode<xbNodeType> *currPtr = llStartPtr;
xbLinkListNode<xbNodeType> *prevPtr = NULL;
for( xbUInt32 i = 0; i < ulNodeCnt; i++ ){
if( currPtr->GetKey() == ntKey ){
if( prevPtr == NULL ){ //then this is the first node
llStartPtr = currPtr->GetNextNode();
if( llStartPtr ) // if more than one link in the linked list
llStartPtr->SetPrevNode( NULL );
delete currPtr;
ulNodeCnt--;
return i + 1;
}
else {
prevPtr->SetNextNode( currPtr->GetNextNode());
if( currPtr->GetNextNode())
currPtr->GetNextNode()->SetPrevNode( prevPtr );
delete currPtr;
ulNodeCnt--;
return i + 1;
}
}
prevPtr = currPtr;
currPtr = currPtr->GetNextNode();
}
return XB_NOT_FOUND;
}
template<class xbNodeType>
xbInt16 xbLinkList<xbNodeType>::RemoveFromFront( xbNodeType & ntKey ){
if( ulNodeCnt <= 0 )
return XB_INVALID_NODELINK;
xbLinkListNode<xbNodeType> *p = llStartPtr;
llStartPtr = p->GetNextNode();
if( llStartPtr )
llStartPtr->SetPrevNode( NULL );
ntKey = p->GetKey();
delete p;
ulNodeCnt--;
return XB_NO_ERROR;
}
template<class xbNodeType>
xbInt16 xbLinkList<xbNodeType>::RemoveFromEnd( xbNodeType & ntKey ){
if( ulNodeCnt <= 0 )
return XB_INVALID_NODELINK;
xbLinkListNode<xbNodeType> *p = llEndPtr;
if( p->GetPrevNode()){
llEndPtr = p->GetPrevNode();
llEndPtr->SetNextNode( NULL );
} else {
// there are no more nodes
llStartPtr = NULL;
llEndPtr = NULL;
}
ntKey = p->GetKey();
delete p;
ulNodeCnt--;
return XB_NO_ERROR;
}
template<class xbNodeType>
xbInt16 xbLinkList<xbNodeType>::RemoveFromEnd(){
if( ulNodeCnt <= 0 )
return XB_INVALID_NODELINK;
xbLinkListNode<xbNodeType> *p = llEndPtr;
if( p->GetPrevNode()){
llEndPtr = p->GetPrevNode();
llEndPtr->SetNextNode( NULL );
} else {
// there are no more nodes
llStartPtr = NULL;
llEndPtr = NULL;
}
delete p->GetKey();
delete p;
ulNodeCnt--;
return XB_NO_ERROR;
}
template<class xbNodeType>
xbInt16 xbLinkList<xbNodeType>::SearchFor( const xbNodeType & ntKey ){
xbLinkListNode<xbNodeType> *cPtr = llStartPtr;
for( xbUInt32 i = 0; i < ulNodeCnt; i++ ){
if( cPtr->GetKey() == ntKey )
return i+1;
cPtr = cPtr->GetNextNode();
}
return XB_NO_ERROR;
}
} // namespace
#endif // XB_LINKLIST_SUPPORT
#endif // XB_XBLNKLST_H__
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