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/**
* $Id: GEN_Map.h,v 1.7 2004/04/13 18:11:10 ascotan Exp $
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#ifndef GEN_MAP_H
#define GEN_MAP_H
template <class Key, class Value>
class GEN_Map {
private:
struct Entry {
Entry (Entry *next, Key key, Value value) :
m_next(next),
m_key(key),
m_value(value) {}
Entry *m_next;
Key m_key;
Value m_value;
};
public:
GEN_Map(int num_buckets = 100) : m_num_buckets(num_buckets) {
m_buckets = new Entry *[num_buckets];
for (int i = 0; i < num_buckets; ++i) {
m_buckets[i] = 0;
}
}
int size() {
int count=0;
for (int i=0;i<m_num_buckets;i++)
{
Entry* bucket = m_buckets[i];
while(bucket)
{
bucket = bucket->m_next;
count++;
}
}
return count;
}
Value* at(int index) {
int count=0;
for (int i=0;i<m_num_buckets;i++)
{
Entry* bucket = m_buckets[i];
while(bucket)
{
if (count==index)
{
return &bucket->m_value;
}
bucket = bucket->m_next;
count++;
}
}
return 0;
}
void clear() {
for (int i = 0; i < m_num_buckets; ++i) {
Entry *entry_ptr = m_buckets[i];
while (entry_ptr != 0) {
Entry *tmp_ptr = entry_ptr->m_next;
delete entry_ptr;
entry_ptr = tmp_ptr;
}
m_buckets[i] = 0;
}
}
~GEN_Map() {
clear();
delete [] m_buckets;
}
void insert(const Key& key, const Value& value) {
Entry *entry_ptr = m_buckets[key.hash() % m_num_buckets];
while ((entry_ptr != 0) && !(key == entry_ptr->m_key)) {
entry_ptr = entry_ptr->m_next;
}
if (entry_ptr != 0) {
entry_ptr->m_value = value;
}
else {
Entry **bucket = &m_buckets[key.hash() % m_num_buckets];
*bucket = new Entry(*bucket, key, value);
}
}
void remove(const Key& key) {
Entry **entry_ptr = &m_buckets[key.hash() % m_num_buckets];
while ((*entry_ptr != 0) && !(key == (*entry_ptr)->m_key)) {
entry_ptr = &(*entry_ptr)->m_next;
}
if (*entry_ptr != 0) {
Entry *tmp_ptr = (*entry_ptr)->m_next;
delete *entry_ptr;
*entry_ptr = tmp_ptr;
}
}
Value *operator[](Key key) {
Entry *bucket = m_buckets[key.hash() % m_num_buckets];
while ((bucket != 0) && !(key == bucket->m_key)) {
bucket = bucket->m_next;
}
return bucket != 0 ? &bucket->m_value : 0;
}
private:
int m_num_buckets;
Entry **m_buckets;
};
#endif
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