/////////////////////////////////////////////////////////////////////////////
-// Name: hash.h
+// Name: wx/hash.h
// Purpose: wxHashTable class
// Author: Julian Smart
-// Modified by:
+// Modified by: VZ at 25.02.00: type safe hashes with WX_DECLARE_HASH()
// Created: 01/02/97
// RCS-ID: $Id$
// Copyright: (c)
-// Licence: wxWindows licence
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifndef _WX_WXHASHH__
-#define _WX_WXHASHH__
+#ifndef _WX_HASH_H__
+#define _WX_HASH_H__
#ifdef __GNUG__
#pragma interface "hash.h"
#endif
-#include "wx/object.h"
#include "wx/list.h"
+// the default size of the hash
+#define wxHASH_SIZE_DEFAULT (1000)
+
/*
* A hash table is an array of user-definable size with lists
* of data items hanging off the array positions. Usually there'll
* the list to find the desired item.
*/
-class WXDLLEXPORT wxHashTable: public wxObject
+// ----------------------------------------------------------------------------
+// this is the base class for object hashes: hash tables which contain
+// pointers to objects
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxHashTableBase : public wxObject
{
- DECLARE_DYNAMIC_CLASS(wxHashTable)
+public:
+ wxHashTableBase();
+
+ void Create(wxKeyType keyType = wxKEY_INTEGER,
+ size_t size = wxHASH_SIZE_DEFAULT);
+ void Destroy();
+
+ size_t GetSize() const { return m_hashSize; }
+ size_t GetCount() const { return m_count; }
+
+ void DeleteContents(bool flag);
+
+protected:
+ // find the node for (key, value)
+ wxNodeBase *GetNode(long key, long value) const;
- public:
- int n;
- int current_position;
- wxNode *current_node;
+ // the array of lists in which we store the values for given key hash
+ wxListBase **m_hashTable;
- unsigned int key_type;
- wxList **hash_table;
+ // the size of m_lists array
+ size_t m_hashSize;
- wxHashTable(int the_key_type = wxKEY_INTEGER, int size = 1000);
- ~wxHashTable(void);
-
- void Destroy(void); // Robert Roebling
+ // the type of indexing we use
+ wxKeyType m_keyType;
- bool Create(int the_key_type = wxKEY_INTEGER, int size = 1000);
+ // the total number of elements in the hash
+ size_t m_count;
- // Note that there are 2 forms of Put, Get.
- // With a key and a value, the *value* will be checked
- // when a collision is detected. Otherwise, if there are
- // 2 items with a different value but the same key,
- // we'll retrieve the WRONG ONE. So where possible,
- // supply the required value along with the key.
- // In fact, the value-only versions make a key, and still store
- // the value. The use of an explicit key might be required
- // e.g. when combining several values into one key.
- // When doing that, it's highly likely we'll get a collision,
- // e.g. 1 + 2 = 3, 2 + 1 = 3.
+ // should we delete our data?
+ bool m_deleteContents;
+
+private:
+ // no copy ctor/assignment operator (yet)
+ DECLARE_NO_COPY_CLASS(wxHashTableBase);
+};
+
+// ----------------------------------------------------------------------------
+// for compatibility only
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxHashTable : public wxObject
+{
+public:
+ int n;
+ int current_position;
+ wxNode *current_node;
- // key and value are NOT necessarily the same
- void Put(long key, long value, wxObject *object);
- void Put(long key, const char *value, wxObject *object);
+ unsigned int key_type;
+ wxList **hash_table;
- // key and value are the same
- void Put(long value, wxObject *object);
- void Put(const char *value, wxObject *object);
+ wxHashTable(int the_key_type = wxKEY_INTEGER,
+ int size = wxHASH_SIZE_DEFAULT);
+ ~wxHashTable();
- // key and value not the same
- wxObject *Get(long key, long value) const;
- wxObject *Get(long key, const char *value) const;
+ // copy ctor and assignment operator
+ wxHashTable(const wxHashTable& table) { DoCopy(table); }
+ wxHashTable& operator=(const wxHashTable& table)
+ { Clear(); DoCopy(table); return *this; }
- // key and value are the same
- wxObject *Get(long value) const;
- wxObject *Get(const char *value) const;
+ void DoCopy(const wxHashTable& table);
- // Deletes entry and returns data if found
- wxObject *Delete(long key);
- wxObject *Delete(const char *key);
+ void Destroy();
- wxObject *Delete(long key, int value);
- wxObject *Delete(long key, const char *value);
+ bool Create(int the_key_type = wxKEY_INTEGER,
+ int size = wxHASH_SIZE_DEFAULT);
- // Construct your own integer key from a string, e.g. in case
- // you need to combine it with something
- long MakeKey(const char *string) const;
+ // Note that there are 2 forms of Put, Get.
+ // With a key and a value, the *value* will be checked
+ // when a collision is detected. Otherwise, if there are
+ // 2 items with a different value but the same key,
+ // we'll retrieve the WRONG ONE. So where possible,
+ // supply the required value along with the key.
+ // In fact, the value-only versions make a key, and still store
+ // the value. The use of an explicit key might be required
+ // e.g. when combining several values into one key.
+ // When doing that, it's highly likely we'll get a collision,
+ // e.g. 1 + 2 = 3, 2 + 1 = 3.
- // Way of iterating through whole hash table (e.g. to delete everything)
- // Not necessary, of course, if you're only storing pointers to
- // objects maintained separately
+ // key and value are NOT necessarily the same
+ void Put(long key, long value, wxObject *object);
+ void Put(long key, const wxChar *value, wxObject *object);
- void BeginFind(void);
- wxNode *Next(void);
+ // key and value are the same
+ void Put(long value, wxObject *object);
+ void Put(const wxChar *value, wxObject *object);
- void DeleteContents(bool flag);
- void Clear(void);
+ // key and value not the same
+ wxObject *Get(long key, long value) const;
+ wxObject *Get(long key, const wxChar *value) const;
+ // key and value are the same
+ wxObject *Get(long value) const;
+ wxObject *Get(const wxChar *value) const;
+
+ // Deletes entry and returns data if found
+ wxObject *Delete(long key);
+ wxObject *Delete(const wxChar *key);
+
+ wxObject *Delete(long key, int value);
+ wxObject *Delete(long key, const wxChar *value);
+
+ // Construct your own integer key from a string, e.g. in case
+ // you need to combine it with something
+ long MakeKey(const wxChar *string) const;
+
+ // Way of iterating through whole hash table (e.g. to delete everything)
+ // Not necessary, of course, if you're only storing pointers to
+ // objects maintained separately
+
+ void BeginFind();
+ wxNode *Next();
+
+ void DeleteContents(bool flag);
+ void Clear();
+
+ // Returns number of nodes
+ size_t GetCount() const { return m_count; }
+
+private:
+ size_t m_count; // number of elements in the hashtable
+ bool m_deleteContents;
+
+ DECLARE_DYNAMIC_CLASS(wxHashTable)
};
+// defines a new type safe hash table which stores the elements of type eltype
+// in lists of class listclass
+#define WX_DECLARE_HASH(eltype, listclass, hashclass) \
+ class WXDLLEXPORT hashclass : public wxHashTableBase \
+ { \
+ public: \
+ hashclass(wxKeyType keyType = wxKEY_INTEGER, \
+ size_t size = wxHASH_SIZE_DEFAULT) \
+ { Create(keyType, size); } \
+ \
+ ~hashclass() { Destroy(); } \
+ \
+ void Put(long key, long val, eltype *data) { DoPut(key, val, data); } \
+ void Put(long key, eltype *data) { DoPut(key, key, data); } \
+ \
+ eltype *Get(long key, long value) const \
+ { \
+ wxNodeBase *node = GetNode(key, value); \
+ return node ? ((listclass::Node *)node)->GetData() : (eltype *)0; \
+ } \
+ eltype *Get(long key) const { return Get(key, key); } \
+ \
+ eltype *Delete(long key, long value) \
+ { \
+ eltype *data; \
+ \
+ wxNodeBase *node = GetNode(key, value); \
+ if ( node ) \
+ { \
+ data = ((listclass::Node *)node)->GetData(); \
+ \
+ delete node; \
+ m_count--; \
+ } \
+ else \
+ { \
+ data = (eltype *)0; \
+ } \
+ \
+ return data; \
+ } \
+ eltype *Delete(long key) { return Delete(key, key); } \
+ \
+ protected: \
+ void DoPut(long key, long value, eltype *data) \
+ { \
+ size_t slot = (size_t)abs(key % m_hashSize); \
+ \
+ if ( !m_hashTable[slot] ) \
+ { \
+ m_hashTable[slot] = new listclass(m_keyType); \
+ if ( m_deleteContents ) \
+ m_hashTable[slot]->DeleteContents(TRUE); \
+ } \
+ \
+ ((listclass *)m_hashTable[slot])->Append(value, data); \
+ m_count++; \
+ } \
+ }
+
#endif
- // _WX_WXHASHH__
+ // _WX_HASH_H__
projects / wxWidgets.git / blobdiff