soltools/ldump/hashtbl.hxx

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  30
  31 #ifndef _HASHTBL_HXX
  32 #define _HASHTBL_HXX
  33
  34 // ADT hash table
  35 //
  36 // Invariante:
  37 //    1. m_lElem < m_lSize
  38 //    2. die Elemente in m_Array wurden double-hashed erzeugt
  39 //
  40 class HashItem;
  41
  42 class HashTable
  43 {
  44     unsigned long m_lSize;
  45     unsigned long m_lElem;
  46     HashItem *m_pData;
  47     double    m_dMaxLoadFactor;
  48     double    m_dGrowFactor;
  49     bool      m_bOwner;
  50
  51     unsigned long Hash(const char *cKey) const;
  52     unsigned long DHash(const char *cKey , unsigned long lHash) const;
  53     unsigned long Probe(unsigned long lPos) const;
  54
  55     HashItem* FindPos(const char *cKey) const;
  56     void      SmartGrow();
  57     double    CalcLoadFactor() const;
  58
  59 protected:
  60     friend class HashTableIterator;
  61
  62     virtual void OnDeleteObject(void* pObject);
  63
  64     void* GetObjectAt(unsigned long lPos) const;
  65
  66 // Default-Werte
  67 public:
  68     static double m_defMaxLoadFactor;
  69     static double m_defDefGrowFactor;
  70
  71 public:
  72     HashTable
  73     (
  74         unsigned long   lSize,
  75         bool    bOwner,
  76         double  dMaxLoadFactor = HashTable::m_defMaxLoadFactor /* 0.8 */,
  77         double  dGrowFactor = HashTable::m_defDefGrowFactor /* 2.0 */
  78     );
  79
  80     virtual ~HashTable();
  81
  82     bool  IsFull() const;
  83     unsigned long GetSize() const { return m_lSize; }
  84
  85     void* Find   (const char *cKey ) const;
  86     bool  Insert (const char *cKey , void* pObject);
  87     void* Delete (const char *cKey);
  88 };
  89
  90 // ADT hash table iterator
  91 //
  92 // Invariante: 0 <= m_lAt < m_aTable.GetCount()
  93 //
  94 class HashTableIterator
  95 {
  96     unsigned long        m_lAt;
  97     HashTable const& m_aTable;
  98
  99     void operator =(HashTableIterator &); // not defined
 100
 101     void* FindValidObject(bool bForward);
 102
 103 protected:
 104     void* GetFirst(); // Interation _ohne_ Sortierung
 105     void* GetNext();
 106     void* GetLast();
 107     void* GetPrev();
 108
 109 public:
 110     HashTableIterator(HashTable const&);
 111 };
 112
 113 #endif // _HASHTBL_HXX
 114