AOO410/main/soltools/ldump/hashtbl.hxx

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#ifndef _HASHTBL_HXX
#define _HASHTBL_HXX

// ADT hash table
//
// Invariante:
//    1. m_lElem < m_lSize
//    2. die Elemente in m_Array wurden double-hashed erzeugt
//
class HashItem;

class HashTable
{
    unsigned long m_lSize;
    unsigned long m_lElem;
    HashItem *m_pData;
    double    m_dMaxLoadFactor;
    double    m_dGrowFactor;
    bool      m_bOwner;

    unsigned long Hash(const char *cKey) const;
    unsigned long DHash(const char *cKey , unsigned long lHash) const;
    unsigned long Probe(unsigned long lPos) const;

    HashItem* FindPos(const char *cKey) const;
    void      SmartGrow();
    double    CalcLoadFactor() const;

protected:
	friend class HashTableIterator;

    virtual void OnDeleteObject(void* pObject);

    void* GetObjectAt(unsigned long lPos) const;

// Default-Werte
public:
	static double m_defMaxLoadFactor;
	static double m_defDefGrowFactor;

public:
    HashTable
	(
		unsigned long	lSize,
		bool	bOwner,
		double	dMaxLoadFactor = HashTable::m_defMaxLoadFactor /* 0.8 */,
		double	dGrowFactor = HashTable::m_defDefGrowFactor /* 2.0 */
	);

    virtual ~HashTable();

    bool  IsFull() const;
    unsigned long GetSize() const { return m_lSize; }

    void* Find   (const char *cKey ) const;
    bool  Insert (const char *cKey , void* pObject);
    void* Delete (const char *cKey);
};

// ADT hash table iterator
//
// Invariante: 0 <= m_lAt < m_aTable.GetCount()
//
class HashTableIterator
{
	unsigned long	 m_lAt;
	HashTable const& m_aTable;

    void operator =(HashTableIterator &); // not defined

	void* FindValidObject(bool bForward);

protected:
	void* GetFirst(); // Interation _ohne_ Sortierung
	void* GetNext();
	void* GetLast();
	void* GetPrev();

public:
	HashTableIterator(HashTable const&);
};

#endif // _HASHTBL_HXX