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/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
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.
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
*/
#ifndef _HashTable_
#define _HashTable_
#include "SC_Types.h"
#include "SC_BoundsMacros.h"
#include "Hash.h"
#include <stddef.h>
template<class T, class Allocator, class KeyType>
class HashTable
{
Allocator *mPool;
int32 mNumItems, mMaxItems, mTableSize, mHashMask;
T** mItems;
bool mCanResize;
public:
HashTable(Allocator *inPool, int32 inMaxItems, bool inCanResize = true)
: mPool(inPool)
{
mNumItems = 0;
mMaxItems = inMaxItems;
mTableSize = mMaxItems << 1;
mItems = AllocTable(mTableSize);
mHashMask = mTableSize - 1;
mCanResize = inCanResize;
}
~HashTable() {
mPool->Free(mItems);
}
int32 TableSize() const { return mTableSize; }
int32 MaxItems() const { return mMaxItems; }
int32 NumItems() const { return mNumItems; }
T** AllocTable(int inTableSize)
{
size_t size = inTableSize * sizeof(T*);
T** items = static_cast<T**>(mPool->Alloc(size));
for (int i=0; i<inTableSize; ++i) {
items[i] = 0;
}
return items;
}
void Resize()
{
int32 newSize = sc_max(mTableSize << 1, 32);
T** oldItems = mItems;
mItems = AllocTable(newSize);
for (int i=0; i<mTableSize; ++i) {
T* item = oldItems[i];
if (item) Add(item);
}
mTableSize = newSize;
mMaxItems = mTableSize >> 1;
mHashMask = mTableSize - 1;
mPool->Free(oldItems);
//printf("mMaxItems %d mTableSize %d newSize %d\n", mMaxItems, mTableSize, newSize);
}
bool Add(T* inItem)
{
//printf("mNumItems %d\n", mNumItems);
//printf("mMaxItems %d\n", mMaxItems);
//printf("mCanResize %d\n", mCanResize);
if (mNumItems >= mMaxItems) {
if (!mCanResize) return false;
Resize();
}
//printf("GetHash(inItem) %d\n", GetHash(inItem));
//printf("GetKey(inItem) %s\n", GetKey(inItem));
int32 index = IndexFor(GetHash(inItem), GetKey(inItem));
//printf("index %d\n", index);
T *item = mItems[index];
if (item) return item == inItem;
mItems[index] = inItem;
mNumItems++;
return true;
}
bool Remove(T* inItem)
{
int32 index = IndexFor(GetHash(inItem), GetKey(inItem));
if (mItems[index] != inItem) return false;
mItems[index] = 0;
FixCollisionsFrom(index);
mNumItems--;
return true;
}
int32 IndexFor(int32 inHashID, KeyType inKey) const
{
int index = inHashID & mHashMask;
for(;;) {
T *item = mItems[index];
if (!item) return index;
if (GetHash(item) == inHashID
&& strcmp(inKey, GetKey(item)) == 0) return index;
index = (index + 1) & mHashMask;
}
}
T* Get(KeyType inKey) const
{
return Get(Hash(inKey), inKey);
}
T* Get(int32 inHashID, KeyType inKey) const
{
int32 index = IndexFor(inHashID, inKey);
return mItems[index];
}
bool Includes(T* inItem) const
{
return Get(GetHash(inItem), GetKey(inItem)) == inItem;
}
T* AtIndex(int32 inIndex) const
{
return mItems[inIndex];
}
private:
void FixCollisionsFrom(int32 inIndex)
{
int oldIndex = inIndex;
for (;;) {
oldIndex = (oldIndex + 1) & mHashMask;
T *oldItem = mItems[oldIndex];
if (!oldItem) break;
int newIndex = IndexFor(GetHash(oldItem), GetKey(oldItem));
if (oldIndex != newIndex) {
mItems[oldIndex] = mItems[newIndex];
mItems[newIndex] = oldItem;
}
}
}
};
template<class T, int kMaxItems, class KeyType>
class StaticHashTable
{
int32 mNumItems, mTableSize, mHashMask;
T* mItems[kMaxItems*2];
public:
StaticHashTable()
{
mNumItems = 0;
mTableSize = kMaxItems << 1;
ClearTable();
mHashMask = mTableSize - 1;
}
~StaticHashTable() {
}
int32 TableSize() const { return mTableSize; }
int32 MaxItems() const { return kMaxItems; }
int32 NumItems() const { return mNumItems; }
void ClearTable()
{
for (int i=0; i<mTableSize; ++i) {
mItems[i] = 0;
}
}
bool Add(T* inItem)
{
if (mNumItems >= kMaxItems) return false;
int32 index = IndexFor(GetHash(inItem), GetKey(inItem));
T *item = mItems[index];
if (item) return item == inItem;
mItems[index] = inItem;
mNumItems++;
return true;
}
bool Remove(T* inItem)
{
int32 index = IndexFor(GetHash(inItem), GetKey(inItem));
if (mItems[index] != inItem) return false;
mItems[index] = 0;
FixCollisionsFrom(index);
mNumItems--;
return true;
}
int32 IndexFor(int32 inHashID, KeyType inKey) const
{
int index = inHashID & mHashMask;
for(;;) {
T *item = mItems[index];
if (!item) return index;
if (GetHash(item) == inHashID
&& strcmp(inKey, GetKey(item)) == 0) return index;
index = (index + 1) & mHashMask;
}
}
T* Get(KeyType inKey) const
{
return Get(Hash(inKey), inKey);
}
T* Get(int32 inHashID, KeyType inKey) const
{
int32 index = IndexFor(inHashID, inKey);
return mItems[index];
}
bool Includes(T* inItem) const
{
return Get(GetHash(inItem), GetKey(inItem)) == inItem;
}
T* AtIndex(int32 inIndex) const
{
return mItems[inIndex];
}
private:
void FixCollisionsFrom(int32 inIndex)
{
int oldIndex = inIndex;
for (;;) {
oldIndex = (oldIndex + 1) & mHashMask;
T *oldItem = mItems[oldIndex];
if (!oldItem) break;
int newIndex = IndexFor(GetHash(oldItem), GetKey(oldItem));
if (oldIndex != newIndex) {
mItems[oldIndex] = mItems[newIndex];
mItems[newIndex] = oldItem;
}
}
}
};
#endif
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