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ObjectList.h
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ObjectList.h
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//---------------------------------------------------------------------------
/*
TVP2 ( T Visual Presenter 2 ) A script authoring tool
Copyright (C) 2000 W.Dee <dee@kikyou.info> and contributors
See details of license at "license.txt"
*/
//---------------------------------------------------------------------------
// Safe Object List
//---------------------------------------------------------------------------
#ifndef ObjectListH
#define ObjectListH
#include "tp_stub.h"
//---------------------------------------------------------------------------
/*
Simple implementation of auto array for objects.
This manages neither object's construction nor destruction.
*/
//---------------------------------------------------------------------------
#define TOBJECTLIST_INC_COUNT 64
template <typename ObjT>
class tVoidObjectList
{
private:
ObjT** Objects;
ObjT** BackupedObjects;
//void * * Objects; // array of the object
//void * * BackupedObjects; // backuped objects
tjs_int BackupedCount; // item count in BackupedObjects
tjs_int Capacity; // capacity of the array
tjs_int Count; // actual count
tjs_int SafeLockCount; // safe lock reference count
bool Backuped; // whether "Object" is backuped to "BackupedObject"
void InternalAssign(const tVoidObjectList & ref)
{
// this internal function does not free the array previously allocated.
// only "Objects" ( not "BackupedObjects" ) is copied.
if(ref.Count)
{
//Objects = (void **)TJS_malloc(ref.Count * sizeof(void *) );
Objects = new ObjT*[ref.Count];
memcpy(Objects, ref.Objects, ref.Count * sizeof(ObjT *) );
}
else
{
Objects = NULL;
}
Capacity = Count = ref.Count;
}
void Backup()
{
// backup current "Objects" to "BackupedObjects"
if(Count)
{
//BackupedObjects = (void**)TJS_malloc(Count * sizeof(void *) );
BackupedObjects = new ObjT*[Count];
memcpy(BackupedObjects, Objects, Count * sizeof(ObjT *) );
}
else
{
BackupedObjects = NULL;
}
BackupedCount = Count;
Backuped = true;
}
void Commit()
{
// commit the current array
// this simply free BackupedObjects ( and its related things )
if(BackupedObjects) free(BackupedObjects);
BackupedObjects = NULL;
BackupedCount = 0;
Backuped = false;
}
public:
tVoidObjectList()
{
Objects = NULL;
BackupedObjects = NULL;
Capacity = 0;
Count = 0;
Backuped = false;
SafeLockCount = 0;
}
tVoidObjectList(const tVoidObjectList & ref)
{
SafeLockCount = 0;
BackupedObjects = NULL;
Backuped = false;
InternalAssign(ref);
}
~tVoidObjectList()
{
if(Objects) delete[] Objects;
if(BackupedObjects) delete[] BackupedObjects;
}
void operator =(const tVoidObjectList & ref)
{
Assign(ref);
}
void Assign(const tVoidObjectList & ref)
{
// note that this function does not change any safe locking
// effects ( locking count is not changed )
if(Objects) delete[] Objects;
InternalAssign(ref);
}
void SafeLock()
{
// lock array safely
// safe locking is managed by reference counter;
if(SafeLockCount == 0)
Compact(); // this is needed
SafeLockCount ++;
}
void SafeUnlock()
{
SafeLockCount --;
if(SafeLockCount == 0)
Commit();
}
tjs_int GetSafeLockedObjectCount() const
{
// this function only valid in safe locking
if(Backuped) return BackupedCount;
return Count;
}
ObjT * GetSafeLockedObjectAt(tjs_int index) const
{
// this migight contain null pointer
if(Backuped)
{
return BackupedObjects[index];
}
return Objects[index];
}
tjs_int GetCount() const
{
// note that if you want to ensure the result is
// actual object count in the array,
// call Compact() before GetCount().
return Count;
}
tjs_int GetActualCount()
{
// this does Compact() before returning current Count,
// ensuring returned count is actual object count in the array.
Compact();
return Count;
}
void SetCount(tjs_int count)
{
if(SafeLockCount && !Backuped) Backup();
Reserve(count);
Count = count;
}
void Reserve(tjs_int count)
{
if(SafeLockCount && !Backuped) Backup();
if(Capacity < count)
{
Capacity = count + TOBJECTLIST_INC_COUNT;
if(Capacity) {
ObjT** tmp = new ObjT*[Capacity];
if( Count > 0 ) {
memcpy( tmp, Objects, Count * sizeof(ObjT *) );
}
delete[] Objects;
Objects = tmp;
//Objects = (void**)TJS_realloc(Objects, Capacity * sizeof(void *));
}else
if(Objects) delete[] Objects, Objects = NULL;
}
}
void Compact()
{
// this eliminates NULL pointer from the array
if(SafeLockCount && !Backuped) Backup();
ObjT **s, **d, **slim;
slim = Objects + Count;
s = d = Objects;
while(s < slim)
{
if(*s == NULL)
{
s++;
continue;
}
if(s != d) *d = *s;
s++, d++;
}
Count = (tjs_int)(d - Objects);
Capacity = Count;
if(Count) {
//Objects = (void**)TJS_realloc(Objects, Count * sizeof(void *));
ObjT** tmp = new ObjT*[Count];
memcpy( tmp, Objects, Count * sizeof(ObjT *) );
delete[] Objects;
Objects = tmp;
}else
if(Objects) delete[] Objects, Objects = NULL;
}
ObjT * &operator [] (tjs_int index)
{
// this might return a null pointer
if(SafeLockCount && !Backuped) Backup();
return Objects[index];
}
ObjT * const &operator [] (tjs_int index) const
{
// this might return a null pointer
return Objects[index];
}
tjs_int Find(ObjT * object) const
{
// find "object" from array
// return -1 if "object" does not exist
if(!object) return -1; // null cannot be finded
ObjT * const * s = Objects;
ObjT * const * slim = Objects + Count;
while(s < slim)
{
if(*s == object) return (tjs_int)(s - Objects);
s++;
}
return -1;
}
bool Add(ObjT * object)
{
// add "object" to array
// this does not allow duplicates
if(SafeLockCount && !Backuped) Backup();
if(!object) return false; // null cannot be added
if(Find(object) == -1)
{
tjs_int orgcount = Count;
SetCount(Count+1);
Objects[orgcount] = object;
return true;
}
return false;
}
bool Remove(ObjT * object)
{
// remove object from array
// (this only set the pointer to null)
if(SafeLockCount && !Backuped) Backup();
tjs_int index = Find(object);
bool ret;
if(index != -1)
{
Objects[index] = NULL;
ret = true;
}
else
{
ret = false;
}
if(Backuped && object)
{
// remove also from BackupedObjects
ObjT * * s = BackupedObjects,
* * slim = BackupedObjects + BackupedCount;
while(s < slim)
{
if(*s == object)
{
*s = NULL;
break;
}
s++;
}
}
return ret;
}
void Remove(tjs_int index)
{
if(SafeLockCount && !Backuped) Backup();
ObjT * object = Objects[index];
Objects[index] = NULL;
if(Backuped && object)
{
// remove also from BackupedObjects
ObjT ** s = BackupedObjects,
** slim = BackupedObjects + BackupedCount;
while(s < slim)
{
if(*s == object)
{
*s = NULL;
break;
}
s++;
}
}
}
};
//---------------------------------------------------------------------------
// template wrappter class for tVoidObjectList
template <typename ObjT>
class tObjectList
{
private:
tVoidObjectList<ObjT> List;
public:
tObjectList() : List()
{
}
tObjectList(const tObjectList<ObjT> & ref) : List(ref.List)
{
}
~tObjectList()
{
}
void operator =(const tObjectList<ObjT> & ref)
{
List.operator =(ref.List);
}
void Assign(const tObjectList<ObjT> & ref)
{
List.Assign(ref.List);
}
void SafeLock()
{
List.SafeLock();
}
void SafeUnlock()
{
List.SafeUnlock();
}
tjs_int GetSafeLockedObjectCount() const
{
return List.GetSafeLockedObjectCount();
}
ObjT * GetSafeLockedObjectAt(tjs_int index) const
{
return List.GetSafeLockedObjectAt(index);
}
tjs_int GetCount() const
{
return List.GetCount();
}
tjs_int GetActualCount()
{
return List.GetActualCount();
}
void SetCount(tjs_int count)
{
List.SetCount(count);
}
void Reserve(tjs_int count)
{
List.Reserve(count);
}
void Compact()
{
List.Compact();
}
ObjT * & operator [] (tjs_int index)
{
return List[index];
}
ObjT * const & operator [] (tjs_int index) const
{
return List[index];
}
tjs_int Find(ObjT * object) const
{
return List.Find( object );
}
bool Add(ObjT * object)
{
return List.Add( object );
}
bool Remove(ObjT * object)
{
return List.Remove( object );
}
void Remove(tjs_int index)
{
List.Remove(index);
}
};
//---------------------------------------------------------------------------
template <typename ObjT>
class tVoidObjectListSafeLockHolder
{
private:
tVoidObjectList<ObjT> & List;
public:
tVoidObjectListSafeLockHolder(tVoidObjectList<ObjT> &list) : List(list)
{
List.SafeLock();
}
~tVoidObjectListSafeLockHolder()
{
List.SafeUnlock();
}
};
//---------------------------------------------------------------------------
template <typename ObjT>
class tObjectListSafeLockHolder
{
private:
tObjectList<ObjT> & List;
public:
tObjectListSafeLockHolder(tObjectList<ObjT> &list) : List(list)
{
List.SafeLock();
}
~tObjectListSafeLockHolder()
{
List.SafeUnlock();
}
};
//---------------------------------------------------------------------------
#endif