117 lines
2 KiB
C++
117 lines
2 KiB
C++
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/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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GenTable.hxx
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Abstract:
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Generic wrapper for a bucket hash class.
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Used for ID, ID[2], ID[3] and string index tables.
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Author:
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Mario Goertzel [MarioGo]
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Revision History:
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MarioGo 12-13-95 Pulled from uuid index hash table
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MarioGo 12-18-95 Changed to use generic keys.
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--*/
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#ifndef __GENERIC_TABLE_HXX
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#define __GENERIC_TABLE_HXX
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class CTableKey {
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public:
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virtual DWORD Hash() = 0;
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virtual BOOL Compare(CTableKey &tk) = 0;
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};
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class CHashTable;
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class CTableElement : public CReferencedObject
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{
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friend class CHashTable;
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public:
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CTableElement() : _pnext(0) {}
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~CTableElement() { ASSERT(_pnext == 0); }
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virtual DWORD Hash() = 0;
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virtual BOOL Compare(CTableKey &tk) = 0;
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virtual BOOL Compare(CONST CTableElement *element) = 0;
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protected:
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void
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Unlink() {
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_pnext = 0;
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}
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CTableElement *
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Next() {
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return(_pnext);
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}
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CTableElement *
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Insert(IN CTableElement *pElement) {
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// Can be called on a null this pointer.
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pElement->_pnext = this;
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return(pElement);
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}
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CTableElement *
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RemoveMatching(CTableKey &tkRemove,
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CTableElement **ppRemoved);
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CTableElement *
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RemoveMatching(CTableElement *pRemove,
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CTableElement **ppRemoved
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);
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private:
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CTableElement *_pnext;
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};
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typedef CTableElement *pCTableElement;
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class CHashTable
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{
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public:
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CHashTable(ORSTATUS &status, UINT start_size = 32 );
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~CHashTable();
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void Add(pCTableElement element);
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CTableElement *Lookup(CTableKey &tk);
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CTableElement *Remove(CTableKey &tk);
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void Remove(CTableElement *pElement);
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CTableElement *Another();
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DWORD Size() { return(_cElements); }
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private:
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CTableElement *
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RemoveHelper(DWORD hash);
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DWORD _cBuckets;
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DWORD _cElements;
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CTableElement **_buckets;
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CTableElement *_last;
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};
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#endif // __GENERIC_TABLE_HXX
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