X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c801d85f158c4cba50b588807daabdcbd0ed3853..94e0018723919fe2ca2f5b5f0a42804c16dbf3a1:/src/common/hash.cpp

diff --git a/src/common/hash.cpp b/src/common/hash.cpp
index 1aba64563c..8c7049b6b4 100644
--- a/src/common/hash.cpp
+++ b/src/common/hash.cpp
@@ -1,350 +1,383 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        hash.cpp
+// Name:        src/common/hash.cpp
 // Purpose:     wxHashTable implementation
 // 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) Julian Smart and Markus Holzem
-// Licence:   	wxWindows licence
+// Copyright:   (c) Julian Smart
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
-#pragma implementation "hash.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #ifndef WX_PRECOMP
-#include "wx/list.h"
+    #include "wx/hash.h"
+    #include "wx/object.h"
 #endif
 
-#include "wx/hash.h"
-
-#include <string.h>
-#include <stdarg.h>
+wxHashTableBase_Node::wxHashTableBase_Node( long key, void* value,
+                                            wxHashTableBase* table )
+    : m_value( value ), m_hashPtr( table )
+{
+    m_key.integer = key;
+}
 
-#if !USE_SHARED_LIBRARY
-IMPLEMENT_DYNAMIC_CLASS(wxHashTable, wxObject)
-#endif
+wxHashTableBase_Node::wxHashTableBase_Node( const wxString& key, void* value,
+                                            wxHashTableBase* table )
+    : m_value( value ), m_hashPtr( table )
+{
+    m_key.string = new wxString(key);
+}
 
-wxHashTable::wxHashTable (const int the_key_type, const int size)
+wxHashTableBase_Node::~wxHashTableBase_Node()
 {
-  n = size;
-  current_position = -1;
-  current_node = NULL;
-
-  key_type = the_key_type;
-  hash_table = new wxList *[size];
-  int i;
-  for (i = 0; i < size; i++)
-    hash_table[i] = NULL;
+    if( m_hashPtr ) m_hashPtr->DoRemoveNode( this );
 }
 
-wxHashTable::~wxHashTable (void)
+//
+
+wxHashTableBase::wxHashTableBase()
+    : m_size( 0 ), m_count( 0 ), m_table( NULL ), m_keyType( wxKEY_NONE ),
+      m_deleteContents( false )
 {
-  int i;
-  for (i = 0; i < n; i++)
-    if (hash_table[i])
-      delete hash_table[i];
-  delete[] hash_table;
 }
 
-bool wxHashTable::Create(const int the_key_type, const int size)
+void wxHashTableBase::Create( wxKeyType keyType, size_t size )
 {
-  n = size;
-  current_position = -1;
-  current_node = NULL;
-
-  key_type = the_key_type;
-  if (hash_table)
-    delete[] hash_table;
-  hash_table = new wxList *[size];
-  int i;
-  for (i = 0; i < size; i++)
-    hash_table[i] = NULL;
-  return TRUE;
+    m_keyType = keyType;
+    m_size = size;
+    m_table = new wxHashTableBase_Node*[ m_size ];
+
+    for( size_t i = 0; i < m_size; ++i )
+        m_table[i] = NULL;
 }
 
-void wxHashTable::Put (const long key, const long value, wxObject * object)
+void wxHashTableBase::Clear()
 {
-  // Should NEVER be
-  long k = (long) key;
-  if (k < 0)
-    k = -k;
+    for( size_t i = 0; i < m_size; ++i )
+    {
+        Node* end = m_table[i];
 
-  int position = (int) (k % n);
-  if (!hash_table[position])
-    hash_table[position] = new wxList (wxKEY_INTEGER);
+        if( end == NULL )
+            continue;
 
-  hash_table[position]->Append (value, object);
+        Node *curr, *next = end->GetNext();
+
+        do
+        {
+            curr = next;
+            next = curr->GetNext();
+
+            DoDestroyNode( curr );
+
+            delete curr;
+        }
+        while( curr != end );
+
+        m_table[i] = NULL;
+    }
+
+    m_count = 0;
 }
 
-void wxHashTable::Put (const long key, const char *value, wxObject * object)
+void wxHashTableBase::DoRemoveNode( wxHashTableBase_Node* node )
 {
-  // Should NEVER be
-  long k = (long) key;
-  if (k < 0)
-    k = -k;
+    size_t bucket = ( m_keyType == wxKEY_INTEGER ?
+                      node->m_key.integer        :
+                      MakeKey( *node->m_key.string ) ) % m_size;
+
+    if( node->GetNext() == node )
+    {
+        // single-node chain (common case)
+        m_table[bucket] = NULL;
+    }
+    else
+    {
+        Node *start = m_table[bucket], *curr;
+        Node* prev = start;
+
+        for( curr = prev->GetNext(); curr != node;
+             prev = curr, curr = curr->GetNext() ) ;
 
-  int position = (int) (k % n);
-  if (!hash_table[position])
-    hash_table[position] = new wxList (wxKEY_INTEGER);
+        DoUnlinkNode( bucket, node, prev );
+    }
 
-  hash_table[position]->Append (value, object);
+    DoDestroyNode( node );
 }
 
-void wxHashTable::Put (const long key, wxObject * object)
+void wxHashTableBase::DoDestroyNode( wxHashTableBase_Node* node )
 {
-  // Should NEVER be
-  long k = (long) key;
-  if (k < 0)
-    k = -k;
+    // if it is called from DoRemoveNode, node has already been
+    // removed, from other places it does not matter
+    node->m_hashPtr = NULL;
+
+    if( m_keyType == wxKEY_STRING )
+        delete node->m_key.string;
+    if( m_deleteContents )
+        DoDeleteContents( node );
+}
 
-  int position = (int) (k % n);
-  if (!hash_table[position])
-    hash_table[position] = new wxList (wxKEY_INTEGER);
+void wxHashTableBase::Destroy()
+{
+    Clear();
 
-  hash_table[position]->Append (k, object);
+    wxDELETEA(m_table);
+    m_size = 0;
 }
 
-void wxHashTable::Put (const char *key, wxObject * object)
+void wxHashTableBase::DoInsertNode( size_t bucket, wxHashTableBase_Node* node )
 {
-  int position = (int) (MakeKey (key) % n);
+    if( m_table[bucket] == NULL )
+    {
+        m_table[bucket] = node->m_next = node;
+    }
+    else
+    {
+        Node *prev = m_table[bucket];
+        Node *next = prev->m_next;
 
-  if (!hash_table[position])
-    hash_table[position] = new wxList (wxKEY_STRING);
+        prev->m_next = node;
+        node->m_next = next;
+        m_table[bucket] = node;
+    }
 
-  hash_table[position]->Append (key, object);
+    ++m_count;
 }
 
-wxObject *wxHashTable::Get (const long key, const long value) const
+void wxHashTableBase::DoPut( long key, long hash, void* data )
 {
-  // Should NEVER be
-  long k = (long) key;
-  if (k < 0)
-    k = -k;
+    wxASSERT( m_keyType == wxKEY_INTEGER );
 
-  int position = (int) (k % n);
-  if (!hash_table[position])
-    return NULL;
-  else
-    {
-      wxNode *node = hash_table[position]->Find (value);
-      if (node)
-	return node->Data ();
-      else
-	return NULL;
-    }
+    size_t bucket = size_t(hash) % m_size;
+    Node* node = new wxHashTableBase_Node( key, data, this );
+
+    DoInsertNode( bucket, node );
 }
 
-wxObject *wxHashTable::Get (const long key, const char *value) const
+void wxHashTableBase::DoPut( const wxString& key, long hash, void* data )
 {
-  // Should NEVER be
-  long k = (long) key;
-  if (k < 0)
-    k = -k;
+    wxASSERT( m_keyType == wxKEY_STRING );
 
-  int position = (int) (k % n);
-  if (!hash_table[position])
-    return NULL;
-  else
-    {
-      wxNode *node = hash_table[position]->Find (value);
-      if (node)
-	return node->Data ();
-      else
-	return NULL;
-    }
+    size_t bucket = size_t(hash) % m_size;
+    Node* node = new wxHashTableBase_Node( key, data, this );
+
+    DoInsertNode( bucket, node );
 }
 
-wxObject *wxHashTable::Get (const long key) const
+void* wxHashTableBase::DoGet( long key, long hash ) const
 {
-  // Should NEVER be
-  long k = (long) key;
-  if (k < 0)
-    k = -k;
+    wxASSERT( m_keyType == wxKEY_INTEGER );
 
-  int position = (int) (k % n);
-  if (!hash_table[position])
-    return NULL;
-  else
+    size_t bucket = size_t(hash) % m_size;
+
+    if( m_table[bucket] == NULL )
+        return NULL;
+
+    Node *first = m_table[bucket]->GetNext(),
+         *curr = first;
+
+    do
     {
-      wxNode *node = hash_table[position]->Find (k);
-      return node ? node->Data () : (wxObject*)NULL;
+        if( curr->m_key.integer == key )
+            return curr->m_value;
+
+        curr = curr->GetNext();
     }
+    while( curr != first );
+
+    return NULL;
 }
 
-wxObject *wxHashTable::Get (const char *key) const
+void* wxHashTableBase::DoGet( const wxString& key, long hash ) const
 {
-  int position = (int) (MakeKey (key) % n);
+    wxASSERT( m_keyType == wxKEY_STRING );
 
-  if (!hash_table[position])
-    return NULL;
-  else
+    size_t bucket = size_t(hash) % m_size;
+
+    if( m_table[bucket] == NULL )
+        return NULL;
+
+    Node *first = m_table[bucket]->GetNext(),
+         *curr = first;
+
+    do
     {
-      wxNode *node = hash_table[position]->Find (key);
-      return node ? node->Data () : (wxObject*)NULL;
+        if( *curr->m_key.string == key )
+            return curr->m_value;
+
+        curr = curr->GetNext();
     }
+    while( curr != first );
+
+    return NULL;
 }
 
-wxObject *wxHashTable::Delete (const long key)
+void wxHashTableBase::DoUnlinkNode( size_t bucket, wxHashTableBase_Node* node,
+                                    wxHashTableBase_Node* prev )
 {
-  // Should NEVER be
-  long k = (long) key;
-  if (k < 0)
-    k = -k;
+    if( node == m_table[bucket] )
+        m_table[bucket] = prev;
 
-  int position = (int) (k % n);
-  if (!hash_table[position])
-    return NULL;
-  else
-    {
-      wxNode *node = hash_table[position]->Find (k);
-      if (node)
-	{
-	  wxObject *data = node->Data ();
-	  delete node;
-	  return data;
-	}
-      else
-	return NULL;
-    }
+    if( prev == node && prev == node->GetNext() )
+        m_table[bucket] = NULL;
+    else
+        prev->m_next = node->m_next;
+
+    DoDestroyNode( node );
+    --m_count;
 }
 
-wxObject *wxHashTable::Delete (const char *key)
+void* wxHashTableBase::DoDelete( long key, long hash )
 {
-  int position = (int) (MakeKey (key) % n);
-  if (!hash_table[position])
-    return NULL;
-  else
+    wxASSERT( m_keyType == wxKEY_INTEGER );
+
+    size_t bucket = size_t(hash) % m_size;
+
+    if( m_table[bucket] == NULL )
+        return NULL;
+
+    Node *first = m_table[bucket]->GetNext(),
+         *curr = first,
+         *prev = m_table[bucket];
+
+    do
     {
-      wxNode *node = hash_table[position]->Find (key);
-      if (node)
-	{
-	  wxObject *data = node->Data ();
-	  delete node;
-	  return data;
-	}
-      else
-	return NULL;
+        if( curr->m_key.integer == key )
+        {
+            void* retval = curr->m_value;
+            curr->m_value = NULL;
+
+            DoUnlinkNode( bucket, curr, prev );
+            delete curr;
+
+            return retval;
+        }
+
+        prev = curr;
+        curr = curr->GetNext();
     }
+    while( curr != first );
+
+    return NULL;
 }
 
-wxObject *wxHashTable::Delete (const long key, const int value)
+void* wxHashTableBase::DoDelete( const wxString& key, long hash )
 {
-  // Should NEVER be
-  long k = (long) key;
-  if (k < 0)
-    k = -k;
+    wxASSERT( m_keyType == wxKEY_STRING );
 
-  int position = (int) (k % n);
-  if (!hash_table[position])
-    return NULL;
-  else
+    size_t bucket = size_t(hash) % m_size;
+
+    if( m_table[bucket] == NULL )
+        return NULL;
+
+    Node *first = m_table[bucket]->GetNext(),
+         *curr = first,
+         *prev = m_table[bucket];
+
+    do
     {
-      wxNode *node = hash_table[position]->Find (value);
-      if (node)
-	{
-	  wxObject *data = node->Data ();
-	  delete node;
-	  return data;
-	}
-      else
-	return NULL;
+        if( *curr->m_key.string == key )
+        {
+            void* retval = curr->m_value;
+            curr->m_value = NULL;
+
+            DoUnlinkNode( bucket, curr, prev );
+            delete curr;
+
+            return retval;
+        }
+
+        prev = curr;
+        curr = curr->GetNext();
     }
+    while( curr != first );
+
+    return NULL;
 }
 
-wxObject *wxHashTable::Delete (const long key, const char *value)
+long wxHashTableBase::MakeKey( const wxString& str )
 {
-  int position = (int) (key % n);
-  if (!hash_table[position])
-    return NULL;
-  else
-    {
-      wxNode *node = hash_table[position]->Find (value);
-      if (node)
-	{
-	  wxObject *data = node->Data ();
-	  delete node;
-	  return data;
-	}
-      else
-	return NULL;
-    }
+    long int_key = 0;
+
+    const wxStringCharType *p = str.wx_str();
+    while( *p )
+        int_key += *p++;
+
+    return int_key;
 }
 
-long wxHashTable::MakeKey (const char *string) const
+// ----------------------------------------------------------------------------
+// wxHashTable
+// ----------------------------------------------------------------------------
+
+wxHashTable::wxHashTable( const wxHashTable& table )
+           : wxHashTableBase()
 {
-  long int_key = 0;
+    DoCopy( table );
+}
 
-  while (*string)
-    int_key += (unsigned char) *string++;
+const wxHashTable& wxHashTable::operator=( const wxHashTable& table )
+{
+    Destroy();
+    DoCopy( table );
 
-  return int_key;
+    return *this;
 }
 
-void wxHashTable::BeginFind (void)
+void wxHashTable::DoCopy( const wxHashTable& WXUNUSED(table) )
 {
-  current_position = -1;
-  current_node = NULL;
+    Create( m_keyType, m_size );
+
+    wxFAIL;
 }
 
-wxNode *wxHashTable::Next (void)
+void wxHashTable::DoDeleteContents( wxHashTableBase_Node* node )
 {
-  wxNode *found = NULL;
-  bool end = FALSE;
-  while (!end && !found)
-    {
-      if (!current_node)
-	{
-	  current_position++;
-	  if (current_position >= n)
-	    {
-	      current_position = -1;
-	      current_node = NULL;
-	      end = TRUE;
-	    }
-	  else
-	    {
-	      if (hash_table[current_position])
-		{
-		  current_node = hash_table[current_position]->First ();
-		  found = current_node;
-		}
-	    }
-	}
-      else
-	{
-	  current_node = current_node->Next ();
-	  found = current_node;
-	}
-    }
-  return found;
+    delete ((wxHashTable_Node*)node)->GetData();
 }
 
-void wxHashTable::DeleteContents (const bool flag)
+void wxHashTable::GetNextNode( size_t bucketStart )
 {
-  int i;
-  for (i = 0; i < n; i++)
+    for( size_t i = bucketStart; i < m_size; ++i )
     {
-      if (hash_table[i])
-	hash_table[i]->DeleteContents (flag);
+        if( m_table[i] != NULL )
+        {
+            m_curr = ((Node*)m_table[i])->GetNext();
+            m_currBucket = i;
+            return;
+        }
     }
+
+    m_curr = NULL;
+    m_currBucket = 0;
 }
 
-void wxHashTable::Clear (void)
+wxHashTable::Node* wxHashTable::Next()
 {
-  int i;
-  for (i = 0; i < n; i++)
+    if( m_curr == NULL )
+        GetNextNode( 0 );
+    else
     {
-      if (hash_table[i])
-	hash_table[i]->Clear ();
+        m_curr = m_curr->GetNext();
+
+        if( m_curr == ( (Node*)m_table[m_currBucket] )->GetNext() )
+            GetNextNode( m_currBucket + 1 );
     }
+
+    return m_curr;
 }