313 lines
12 KiB
C++
313 lines
12 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/hash.h
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// Purpose: wxHashTable class
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// Author: Julian Smart
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// Modified by: VZ at 25.02.00: type safe hashes with WX_DECLARE_HASH()
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// Created: 01/02/97
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// Copyright: (c) Julian Smart
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_HASH_H__
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#define _WX_HASH_H__
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#include "wx/defs.h"
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#include "wx/string.h"
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#if !wxUSE_STD_CONTAINERS
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#include "wx/object.h"
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#else
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class WXDLLIMPEXP_FWD_BASE wxObject;
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#endif
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// the default size of the hash
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#define wxHASH_SIZE_DEFAULT (1000)
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/*
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* A hash table is an array of user-definable size with lists
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* of data items hanging off the array positions. Usually there'll
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* be a hit, so no search is required; otherwise we'll have to run down
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* the list to find the desired item.
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*/
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union wxHashKeyValue
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{
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long integer;
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wxString *string;
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};
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// for some compilers (AIX xlC), defining it as friend inside the class is not
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// enough, so provide a real forward declaration
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class WXDLLIMPEXP_FWD_BASE wxHashTableBase;
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class WXDLLIMPEXP_BASE wxHashTableBase_Node
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{
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friend class WXDLLIMPEXP_FWD_BASE wxHashTableBase;
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typedef class WXDLLIMPEXP_FWD_BASE wxHashTableBase_Node _Node;
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public:
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wxHashTableBase_Node( long key, void* value,
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wxHashTableBase* table );
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wxHashTableBase_Node( const wxString& key, void* value,
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wxHashTableBase* table );
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~wxHashTableBase_Node();
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long GetKeyInteger() const { return m_key.integer; }
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const wxString& GetKeyString() const { return *m_key.string; }
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void* GetData() const { return m_value; }
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void SetData( void* data ) { m_value = data; }
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protected:
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_Node* GetNext() const { return m_next; }
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protected:
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// next node in the chain
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wxHashTableBase_Node* m_next;
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// key
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wxHashKeyValue m_key;
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// value
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void* m_value;
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// pointer to the hash containing the node, used to remove the
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// node from the hash when the user deletes the node iterating
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// through it
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// TODO: move it to wxHashTable_Node (only wxHashTable supports
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// iteration)
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wxHashTableBase* m_hashPtr;
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};
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class WXDLLIMPEXP_BASE wxHashTableBase
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#if !wxUSE_STD_CONTAINERS
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: public wxObject
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#endif
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{
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friend class WXDLLIMPEXP_FWD_BASE wxHashTableBase_Node;
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public:
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typedef wxHashTableBase_Node Node;
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wxHashTableBase();
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virtual ~wxHashTableBase() { }
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void Create( wxKeyType keyType = wxKEY_INTEGER,
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size_t size = wxHASH_SIZE_DEFAULT );
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void Clear();
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void Destroy();
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size_t GetSize() const { return m_size; }
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size_t GetCount() const { return m_count; }
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void DeleteContents( bool flag ) { m_deleteContents = flag; }
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static long MakeKey(const wxString& string);
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protected:
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void DoPut( long key, long hash, void* data );
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void DoPut( const wxString& key, long hash, void* data );
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void* DoGet( long key, long hash ) const;
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void* DoGet( const wxString& key, long hash ) const;
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void* DoDelete( long key, long hash );
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void* DoDelete( const wxString& key, long hash );
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private:
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// Remove the node from the hash, *only called from
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// ~wxHashTable*_Node destructor
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void DoRemoveNode( wxHashTableBase_Node* node );
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// destroys data contained in the node if appropriate:
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// deletes the key if it is a string and destrys
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// the value if m_deleteContents is true
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void DoDestroyNode( wxHashTableBase_Node* node );
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// inserts a node in the table (at the end of the chain)
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void DoInsertNode( size_t bucket, wxHashTableBase_Node* node );
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// removes a node from the table (fiven a pointer to the previous
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// but does not delete it (only deletes its contents)
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void DoUnlinkNode( size_t bucket, wxHashTableBase_Node* node,
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wxHashTableBase_Node* prev );
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// unconditionally deletes node value (invoking the
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// correct destructor)
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virtual void DoDeleteContents( wxHashTableBase_Node* node ) = 0;
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protected:
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// number of buckets
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size_t m_size;
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// number of nodes (key/value pairs)
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size_t m_count;
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// table
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Node** m_table;
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// key typ (INTEGER/STRING)
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wxKeyType m_keyType;
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// delete contents when hash is cleared
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bool m_deleteContents;
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private:
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wxDECLARE_NO_COPY_CLASS(wxHashTableBase);
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};
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// ----------------------------------------------------------------------------
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// for compatibility only
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxHashTable_Node : public wxHashTableBase_Node
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{
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friend class WXDLLIMPEXP_FWD_BASE wxHashTable;
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public:
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wxHashTable_Node( long key, void* value,
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wxHashTableBase* table )
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: wxHashTableBase_Node( key, value, table ) { }
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wxHashTable_Node( const wxString& key, void* value,
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wxHashTableBase* table )
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: wxHashTableBase_Node( key, value, table ) { }
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wxObject* GetData() const
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{ return (wxObject*)wxHashTableBase_Node::GetData(); }
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void SetData( wxObject* data )
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{ wxHashTableBase_Node::SetData( data ); }
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wxHashTable_Node* GetNext() const
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{ return (wxHashTable_Node*)wxHashTableBase_Node::GetNext(); }
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};
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// should inherit protectedly, but it is public for compatibility in
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// order to publicly inherit from wxObject
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class WXDLLIMPEXP_BASE wxHashTable : public wxHashTableBase
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{
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typedef wxHashTableBase hash;
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public:
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typedef wxHashTable_Node Node;
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typedef wxHashTable_Node* compatibility_iterator;
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public:
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wxHashTable( wxKeyType keyType = wxKEY_INTEGER,
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size_t size = wxHASH_SIZE_DEFAULT )
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: wxHashTableBase() { Create( keyType, size ); BeginFind(); }
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wxHashTable( const wxHashTable& table );
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virtual ~wxHashTable() { Destroy(); }
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const wxHashTable& operator=( const wxHashTable& );
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// key and value are the same
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void Put(long value, wxObject *object)
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{ DoPut( value, value, object ); }
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void Put(long lhash, long value, wxObject *object)
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{ DoPut( value, lhash, object ); }
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void Put(const wxString& value, wxObject *object)
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{ DoPut( value, MakeKey( value ), object ); }
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void Put(long lhash, const wxString& value, wxObject *object)
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{ DoPut( value, lhash, object ); }
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// key and value are the same
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wxObject *Get(long value) const
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{ return (wxObject*)DoGet( value, value ); }
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wxObject *Get(long lhash, long value) const
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{ return (wxObject*)DoGet( value, lhash ); }
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wxObject *Get(const wxString& value) const
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{ return (wxObject*)DoGet( value, MakeKey( value ) ); }
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wxObject *Get(long lhash, const wxString& value) const
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{ return (wxObject*)DoGet( value, lhash ); }
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// Deletes entry and returns data if found
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wxObject *Delete(long key)
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{ return (wxObject*)DoDelete( key, key ); }
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wxObject *Delete(long lhash, long key)
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{ return (wxObject*)DoDelete( key, lhash ); }
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wxObject *Delete(const wxString& key)
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{ return (wxObject*)DoDelete( key, MakeKey( key ) ); }
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wxObject *Delete(long lhash, const wxString& key)
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{ return (wxObject*)DoDelete( key, lhash ); }
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// Way of iterating through whole hash table (e.g. to delete everything)
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// Not necessary, of course, if you're only storing pointers to
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// objects maintained separately
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void BeginFind() { m_curr = NULL; m_currBucket = 0; }
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Node* Next();
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void Clear() { wxHashTableBase::Clear(); }
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size_t GetCount() const { return wxHashTableBase::GetCount(); }
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protected:
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// copy helper
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void DoCopy( const wxHashTable& copy );
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// searches the next node starting from bucket bucketStart and sets
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// m_curr to it and m_currBucket to its bucket
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void GetNextNode( size_t bucketStart );
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private:
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virtual void DoDeleteContents( wxHashTableBase_Node* node );
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// current node
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Node* m_curr;
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// bucket the current node belongs to
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size_t m_currBucket;
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};
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// defines a new type safe hash table which stores the elements of type eltype
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// in lists of class listclass
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#define _WX_DECLARE_HASH(eltype, dummy, hashclass, classexp) \
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classexp hashclass : public wxHashTableBase \
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{ \
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public: \
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hashclass(wxKeyType keyType = wxKEY_INTEGER, \
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size_t size = wxHASH_SIZE_DEFAULT) \
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: wxHashTableBase() { Create(keyType, size); } \
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\
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virtual ~hashclass() { Destroy(); } \
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\
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void Put(long key, eltype *data) { DoPut(key, key, (void*)data); } \
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void Put(long lhash, long key, eltype *data) \
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{ DoPut(key, lhash, (void*)data); } \
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eltype *Get(long key) const { return (eltype*)DoGet(key, key); } \
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eltype *Get(long lhash, long key) const \
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{ return (eltype*)DoGet(key, lhash); } \
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eltype *Delete(long key) { return (eltype*)DoDelete(key, key); } \
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eltype *Delete(long lhash, long key) \
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{ return (eltype*)DoDelete(key, lhash); } \
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private: \
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virtual void DoDeleteContents( wxHashTableBase_Node* node ) \
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{ delete (eltype*)node->GetData(); } \
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\
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DECLARE_NO_COPY_CLASS(hashclass) \
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}
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// this macro is to be used in the user code
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#define WX_DECLARE_HASH(el, list, hash) \
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_WX_DECLARE_HASH(el, list, hash, class)
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// and this one does exactly the same thing but should be used inside the
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// library
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#define WX_DECLARE_EXPORTED_HASH(el, list, hash) \
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_WX_DECLARE_HASH(el, list, hash, class WXDLLIMPEXP_CORE)
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#define WX_DECLARE_USER_EXPORTED_HASH(el, list, hash, usergoo) \
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_WX_DECLARE_HASH(el, list, hash, class usergoo)
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// delete all hash elements
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//
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// NB: the class declaration of the hash elements must be visible from the
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// place where you use this macro, otherwise the proper destructor may not
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// be called (a decent compiler should give a warning about it, but don't
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// count on it)!
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#define WX_CLEAR_HASH_TABLE(hash) \
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{ \
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(hash).BeginFind(); \
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wxHashTable::compatibility_iterator it = (hash).Next(); \
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while( it ) \
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{ \
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delete it->GetData(); \
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it = (hash).Next(); \
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} \
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(hash).Clear(); \
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}
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#endif // _WX_HASH_H__
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