330 lines
13 KiB
C
330 lines
13 KiB
C
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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#ifndef __pldoublelinkedlist__
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#define __pldoublelinkedlist__
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#include <stdlib.h>
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#include "SafeStdLib.h"
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#include <string.h>
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#include "OSHeaders.h"
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#include "MyAssert.h"
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#ifndef __PLDoubleLinkedListDEBUG__
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#define __PLDoubleLinkedListDEBUG__ 0
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#endif
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template <class T> class PLDoubleLinkedList;
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template <class S> class PLDoubleLinkedListNode
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{
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friend class PLDoubleLinkedList <S>;
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public:
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PLDoubleLinkedListNode( S* element )
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{
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// the node takes ownership of "element"
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fElement = element;
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fNext = NULL;
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fPrev = NULL;
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}
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virtual ~PLDoubleLinkedListNode()
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{
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#if __PLDoubleLinkedListDEBUG__
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Assert( fPrev == NULL && fNext == NULL );
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#endif
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delete fElement;
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}
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S* fElement;
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protected:
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PLDoubleLinkedListNode *fNext;
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PLDoubleLinkedListNode *fPrev;
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};
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template <class T> class PLDoubleLinkedList
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{
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public:
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PLDoubleLinkedList()
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{
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fHead = NULL;
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fTail = NULL;
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fNumNodes = 0;
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}
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virtual ~PLDoubleLinkedList()
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{
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ClearList();
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}
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#if __PLDoubleLinkedListDEBUG__
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void ValidateLinks()
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{
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PLDoubleLinkedListNode<T> *nextNode;
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Assert( fHead == NULL || fHead->fPrev == NULL );
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Assert( fTail == NULL || fTail->fNext == NULL );
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if ( fTail == fHead && fTail != NULL )
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{
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Assert( fTail->fPrev == NULL && fTail->fNext == NULL );
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}
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if ( fHead )
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{
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Assert( fTail != NULL );
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}
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if ( fTail )
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{
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Assert( fHead != NULL );
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}
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if ( fTail && fTail->fPrev )
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Assert( fTail->fPrev->fNext == fTail );
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if ( fHead && fHead->fNext )
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Assert( fHead->fNext->fPrev == fHead );
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nextNode = fHead;
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while ( nextNode )
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{
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Assert( fHead == nextNode || nextNode->fPrev->fNext == nextNode );
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Assert( fTail == nextNode || nextNode->fNext->fPrev == nextNode );
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if ( !nextNode->fNext )
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Assert( fTail == nextNode );
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nextNode = nextNode->fNext;
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}
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nextNode = fTail;
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while ( nextNode )
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{
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Assert( fHead == nextNode || nextNode->fPrev->fNext == nextNode );
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Assert( fTail == nextNode || nextNode->fNext->fPrev == nextNode );
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if ( !nextNode->fPrev )
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Assert( fHead == nextNode );
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nextNode = nextNode->fPrev;
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}
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}
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#endif // __PLDoubleLinkedListDEBUG__
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PLDoubleLinkedListNode<T> * GetFirst() { return fHead; };
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void AddNodeToTail(PLDoubleLinkedListNode<T> *node)
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{
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#if __PLDoubleLinkedListDEBUG__
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// must not be associated with another list
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Assert( node->fPrev == NULL && node->fNext == NULL );
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#endif
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if ( fTail )
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fTail->fNext = node;
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node->fPrev = fTail;
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node->fNext = NULL;
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fTail = node;
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if ( !fHead )
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fHead = node;
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fNumNodes++;
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#if __PLDoubleLinkedListDEBUG__
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ValidateLinks();
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#endif
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}
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void AddNode(PLDoubleLinkedListNode<T> *node )
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{
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#if __PLDoubleLinkedListDEBUG__
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// must not be associated with another list
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Assert( node->fPrev == NULL && node->fNext == NULL );
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#endif
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if ( fHead )
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fHead->fPrev = node;
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node->fPrev = NULL;
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node->fNext = fHead;
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fHead = node;
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if ( !fTail )
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fTail = node;
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fNumNodes++;
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#if __PLDoubleLinkedListDEBUG__
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ValidateLinks();
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#endif
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}
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void RemoveNode(PLDoubleLinkedListNode<T> *node)
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{
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#if __PLDoubleLinkedListDEBUG__
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// must be associated with this list
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Assert( fHead == node || node->fPrev->fNext == node );
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// must be associated with this list
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Assert( fTail == node || node->fNext->fPrev == node );
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#endif
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if ( fHead == node)
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fHead = node->fNext;
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else
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node->fPrev->fNext = node->fNext;
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if ( fTail == node)
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fTail = node->fPrev;
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else
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node->fNext->fPrev = node->fPrev;
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node->fPrev = NULL;
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node->fNext = NULL;
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fNumNodes--;
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#if __PLDoubleLinkedListDEBUG__
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ValidateLinks();
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#endif
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}
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PLDoubleLinkedListNode<T> *ForEachUntil( bool (*doFunc)( PLDoubleLinkedListNode<T> *node, void *userData), void *userData )
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{
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PLDoubleLinkedListNode<T> *nextElement, *curElement;
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bool stopIteration = false;
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curElement = fHead;
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while ( curElement && !stopIteration )
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{
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nextElement = curElement->fNext;
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stopIteration = (*doFunc)( curElement, userData);
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if ( !stopIteration )
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curElement = nextElement;
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}
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return curElement;
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}
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void ForEach( void (*doFunc)( PLDoubleLinkedListNode<T> *node, void *userData), void *userData )
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{
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PLDoubleLinkedListNode<T> *nextElement, *curElement;
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curElement = fHead;
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while ( curElement )
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{
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nextElement = curElement->fNext;
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(*doFunc)( curElement, userData);
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curElement = nextElement;
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}
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}
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void ClearList()
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{
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ForEach( DoClearList, this );
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}
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PLDoubleLinkedListNode<T> *GetNthNode( int nodeIndex )
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{
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return ForEachUntil( CompareIndexToZero, &nodeIndex );
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}
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UInt32 GetNumNodes() { return fNumNodes; }
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protected:
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static bool CompareIndexToZero( PLDoubleLinkedListNode<T> *, void * nodeIndex ) // (node, nodeIndex)
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{
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int val = *(int*)nodeIndex;
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if ( val == 0 )
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return true;
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*(int*)nodeIndex = val -1;
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return false;
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}
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static void DoClearList( PLDoubleLinkedListNode<T> *node, void * listPtr )
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{
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PLDoubleLinkedList<T> *list = (PLDoubleLinkedList<T> *)listPtr;
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list->RemoveNode( node );
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delete node;
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}
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PLDoubleLinkedListNode<T> *fHead;
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PLDoubleLinkedListNode<T> *fTail;
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UInt32 fNumNodes;
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};
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#endif
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