/*
Open Tracker License

Terms and Conditions

Copyright (c) 1991-2000, Be Incorporated. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice applies to all licensees
and shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF TITLE, MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
BE INCORPORATED BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of Be Incorporated shall not be
used in advertising or otherwise to promote the sale, use or other dealings in
this Software without prior written authorization from Be Incorporated.

Tracker(TM), Be(R), BeOS(R), and BeIA(TM) are trademarks or registered trademarks
of Be Incorporated in the United States and other countries. Other brand product
names are registered trademarks or trademarks of their respective holders.
All rights reserved.
*/

/****************************************************************************
** WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING **
**                                                                         **
**                          DANGER, WILL ROBINSON!                         **
**                                                                         **
** The interfaces contained here are part of BeOS's                        **
**                                                                         **
**                     >> PRIVATE NOT FOR PUBLIC USE <<                    **
**                                                                         **
**                                                       implementation.   **
**                                                                         **
** These interfaces              WILL CHANGE        in future releases.    **
** If you use them, your app     WILL BREAK         at some future time.   **
**                                                                         **
** (And yes, this does mean that binaries built from OpenTracker will not  **
** be compatible with some future releases of the OS.  When that happens,  **
** we will provide an updated version of this file to keep compatibility.) **
**                                                                         **
** WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING **
****************************************************************************/

//
// ObjectList is a wrapper around BList that adds type safety,
// optional object ownership, search, insert operations, etc.
//

#ifndef __OBJECT_LIST__
#define __OBJECT_LIST__

#ifndef _BE_H
#include <List.h>
#endif

#include <Debug.h>

template<class T> class BObjectList;

template<class T>
struct UnaryPredicate {

	virtual int operator()(const T *) const
		// virtual could be avoided here if FindBinaryInsertionIndex,
		// etc. were member template functions
		{ return 0; }

private:
	static int _unary_predicate_glue(const void *item, void *context);
	
friend class BObjectList<T>;
};

template<class T>
int 
UnaryPredicate<T>::_unary_predicate_glue(const void *item, void *context)
{
	return ((UnaryPredicate<T> *)context)->operator()((const T *)item);
}


class _PointerList_ : public BList {
public:
	_PointerList_(const _PointerList_ &list);
	_PointerList_(int32 itemsPerBlock = 20, bool owning = false);
	~_PointerList_();
	
	typedef void *(* GenericEachFunction)(void *, void *);
	typedef int (* GenericCompareFunction)(const void *, const void *);
	typedef int (* GenericCompareFunctionWithState)(const void *, const void *,
		void *);
	typedef int (* UnaryPredicateGlue)(const void *, void *);

	void *EachElement(GenericEachFunction, void *);
	void SortItems(GenericCompareFunction);
	void SortItems(GenericCompareFunctionWithState, void *state);
	void HSortItems(GenericCompareFunction);
	void HSortItems(GenericCompareFunctionWithState, void *state);
	
	void *BinarySearch(const void *, GenericCompareFunction) const;
	void *BinarySearch(const void *, GenericCompareFunctionWithState, void *state) const;

	int32 BinarySearchIndex(const void *, GenericCompareFunction) const;
	int32 BinarySearchIndex(const void *, GenericCompareFunctionWithState, void *state) const;
	int32 BinarySearchIndexByPredicate(const void *, UnaryPredicateGlue) const;

	bool Owning() const;
	bool ReplaceItem(int32, void *);

protected:
	bool owning;

};

template<class T>
class BObjectList : private _PointerList_ {
public:

	// iteration and sorting
	typedef T *(* EachFunction)(T *, void *);
	typedef const T *(* ConstEachFunction)(const T *, void *);
	typedef int (* CompareFunction)(const T *, const T *);
	typedef int (* CompareFunctionWithState)(const T *, const T *, void *state);

	BObjectList(int32 itemsPerBlock = 20, bool owning = false);
	BObjectList(const BObjectList &list);
		// clones list; if list is owning, makes copies of all
		// the items

	virtual ~BObjectList();

	BObjectList &operator=(const BObjectList &list);
		// clones list; if list is owning, makes copies of all
		// the items

	// adding and removing
	// ToDo:
	// change Add calls to return const item 
	bool AddItem(T *);
	bool AddItem(T *, int32);
	bool AddList(BObjectList *);
	bool AddList(BObjectList *, int32);

	bool RemoveItem(T *, bool deleteIfOwning = true);
		// if owning, deletes the removed item
	T *RemoveItemAt(int32);
		// returns the removed item

	void MakeEmpty();

	// item access
	T *ItemAt(int32) const;

	bool ReplaceItem(int32 index, T *);
		// if list is owning, deletes the item at <index> first
	T *SwapWithItem(int32 index, T *newItem);
		// same as ReplaceItem, except does not delete old item at <index>,
		// returns it instead

	T *FirstItem() const;
	T *LastItem() const;

	// misc. getters
	int32 IndexOf(const T *) const;
	bool HasItem(const T *) const;
	bool IsEmpty() const;
	int32 CountItems() const;

	T *EachElement(EachFunction, void *);
	const T *EachElement(ConstEachFunction, void *) const;

	void SortItems(CompareFunction);
	void SortItems(CompareFunctionWithState, void *state);
	void HSortItems(CompareFunction);
	void HSortItems(CompareFunctionWithState, void *state);

	// linear search, returns first item that matches predicate
	const T *FindIf(const UnaryPredicate<T> &) const;
	T *FindIf(const UnaryPredicate<T> &);

	// list must be sorted with CompareFunction for these to work
	const T *BinarySearch(const T &, CompareFunction) const;
	const T *BinarySearch(const T &, CompareFunctionWithState, void *state) const;

	// Binary insertion - list must be sorted with CompareFunction for
	// these to work

	// simple insert
	bool BinaryInsert(T *, CompareFunction);
	bool BinaryInsert(T *, CompareFunctionWithState, void *state);
	bool BinaryInsert(T *, const UnaryPredicate<T> &);

	// unique insert, returns false if item already in list
	bool BinaryInsertUnique(T *, CompareFunction);
	bool BinaryInsertUnique(T *, CompareFunctionWithState, void *state);
	bool BinaryInsertUnique(T *, const UnaryPredicate<T> &);

	// insert a copy of the item, returns new inserted item
	T *BinaryInsertCopy(const T &copyThis, CompareFunction);
	T *BinaryInsertCopy(const T &copyThis, CompareFunctionWithState, void *state);

	// insert a copy of the item if not in list already
	// returns new inserted item or existing item in case of a conflict
	T *BinaryInsertCopyUnique(const T &copyThis, CompareFunction);
	T *BinaryInsertCopyUnique(const T &copyThis, CompareFunctionWithState, void *state);

	int32 FindBinaryInsertionIndex(const UnaryPredicate<T> &, bool *alreadyInList = 0) const;
		// returns either the index into which a new item should be inserted
		// or index of an existing item that matches the predicate

	// deprecated API, will go away
	BList *AsBList()
		{ return this; }
	const BList *AsBList() const
		{ return this; }
private:
	void SetItem(int32, T *);
};
	
template<class Item, class Result, class Param1>
Result 
WhileEachListItem(BObjectList<Item> *list, Result (Item::*func)(Param1), Param1 p1)
{
	Result result = 0; 
	int32 count = list->CountItems();
	
	for (int32 index = 0; index < count; index++)
		if ((result = (list->ItemAt(index)->*func)(p1)) != 0)
			break;

	return result;
}

template<class Item, class Result, class Param1>
Result 
WhileEachListItem(BObjectList<Item> *list, Result (*func)(Item *, Param1), Param1 p1)
{
	Result result = 0; 
	int32 count = list->CountItems();
	
	for (int32 index = 0; index < count; index++)
		if ((result = (*func)(list->ItemAt(index), p1)) != 0)
			break;

	return result;
}

template<class Item, class Result, class Param1, class Param2>
Result 
WhileEachListItem(BObjectList<Item> *list, Result (Item::*func)(Param1, Param2),
	Param1 p1, Param2 p2)
{
	Result result = 0; 
	int32 count = list->CountItems();
	
	for (int32 index = 0; index < count; index++)
		if ((result = (list->ItemAt(index)->*func)(p1, p2)) != 0)
			break;

	return result;
}

template<class Item, class Result, class Param1, class Param2>
Result 
WhileEachListItem(BObjectList<Item> *list, Result (*func)(Item *, Param1, Param2),
	Param1 p1, Param2 p2)
{
	Result result = 0; 
	int32 count = list->CountItems();
	
	for (int32 index = 0; index < count; index++)
		if ((result = (*func)(list->ItemAt(index), p1, p2)) != 0)
			break;

	return result;
}

template<class Item, class Result, class Param1, class Param2, class Param3, class Param4>
Result 
WhileEachListItem(BObjectList<Item> *list, Result (*func)(Item *, Param1, Param2,
	Param3, Param4), Param1 p1, Param2 p2, Param3 p3, Param4 p4)
{
	Result result = 0; 
	int32 count = list->CountItems();
	
	for (int32 index = 0; index < count; index++)
		if ((result = (*func)(list->ItemAt(index), p1, p2, p3, p4)) != 0)
			break;

	return result;
}

template<class Item, class Result>
void 
EachListItemIgnoreResult(BObjectList<Item> *list, Result (Item::*func)())
{
	int32 count = list->CountItems();
	for (int32 index = 0; index < count; index++)
		(list->ItemAt(index)->*func)();
}

template<class Item, class Param1>
void 
EachListItem(BObjectList<Item> *list, void (*func)(Item *, Param1), Param1 p1)
{
	int32 count = list->CountItems();
	for (int32 index = 0; index < count; index++)
		(func)(list->ItemAt(index), p1);
}

template<class Item, class Param1, class Param2>
void 
EachListItem(BObjectList<Item> *list, void (Item::*func)(Param1, Param2),
	Param1 p1, Param2 p2)
{
	int32 count = list->CountItems();
	for (int32 index = 0; index < count; index++)
		(list->ItemAt(index)->*func)(p1, p2);
}

template<class Item, class Param1, class Param2>
void 
EachListItem(BObjectList<Item> *list, void (*func)(Item *,Param1, Param2),
	Param1 p1, Param2 p2)
{
	int32 count = list->CountItems();
	for (int32 index = 0; index < count; index++)
		(func)(list->ItemAt(index), p1, p2);
}

template<class Item, class Param1, class Param2, class Param3>
void 
EachListItem(BObjectList<Item> *list, void (*func)(Item *,Param1, Param2,
	Param3), Param1 p1, Param2 p2, Param3 p3)
{
	int32 count = list->CountItems();
	for (int32 index = 0; index < count; index++)
		(func)(list->ItemAt(index), p1, p2, p3);
}


template<class Item, class Param1, class Param2, class Param3, class Param4>
void 
EachListItem(BObjectList<Item> *list, void (*func)(Item *,Param1, Param2,
	Param3, Param4), Param1 p1, Param2 p2, Param3 p3, Param4 p4)
{
	int32 count = list->CountItems();
	for (int32 index = 0; index < count; index++)
		(func)(list->ItemAt(index), p1, p2, p3, p4);
}

// inline code

inline bool
_PointerList_::Owning() const
{
	return owning;
}

template<class T> 
BObjectList<T>::BObjectList(int32 itemsPerBlock, bool owning)
	:	_PointerList_(itemsPerBlock, owning)
{
}

template<class T> 
BObjectList<T>::BObjectList(const BObjectList<T> &list)
	:	_PointerList_(list)
{
	owning = list.owning;
	if (owning) {
		// make our own copies in an owning list
		int32 count = list.CountItems();
		for	(int32 index = 0; index < count; index++) {
			T *item = list.ItemAt(index);
			if (item)
				item = new T(*item);
			SetItem(index, item);
		}
	}
}

template<class T> 
BObjectList<T>::~BObjectList()
{
	if (Owning())
		// have to nuke elements first
		MakeEmpty();
}

template<class T> 
BObjectList<T> &
BObjectList<T>::operator=(const BObjectList<T> &list)
{
	owning = list.owning;
	BObjectList<T> &result = (BObjectList<T> &)_PointerList_::operator=(list);
	if (owning) {
		// make our own copies in an owning list
		int32 count = list.CountItems();
		for	(int32 index = 0; index < count; index++) {
			T *item = list.ItemAt(index);
			if (item)
				item = new T(*item);
			SetItem(index, item);
		}
	}
	return result;
}

template<class T> 
bool 
BObjectList<T>::AddItem(T *item)
{
	// need to cast to void * to make T work for const pointers
	return _PointerList_::AddItem((void *)item);
}

template<class T> 
bool 
BObjectList<T>::AddItem(T *item, int32 atIndex)
{
	return _PointerList_::AddItem((void *)item, atIndex);
}

template<class T> 
bool 
BObjectList<T>::AddList(BObjectList<T> *newItems)
{
	return _PointerList_::AddList(newItems);
}

template<class T> 
bool 
BObjectList<T>::AddList(BObjectList<T> *newItems, int32 atIndex)
{
	return _PointerList_::AddList(newItems, atIndex);
}


template<class T> 
bool 
BObjectList<T>::RemoveItem(T *item, bool deleteIfOwning)
{
	bool result = _PointerList_::RemoveItem((void *)item);
	
	if (result && Owning() && deleteIfOwning)
		delete item;

	return result;
}

template<class T> 
T *
BObjectList<T>::RemoveItemAt(int32 index)
{
	return (T *)_PointerList_::RemoveItem(index);
}

template<class T> 
inline T *
BObjectList<T>::ItemAt(int32 index) const
{
	return (T *)_PointerList_::ItemAt(index);
}

template<class T>
bool 
BObjectList<T>::ReplaceItem(int32 index, T *item)
{
	if (owning)
		delete ItemAt(index);
	return _PointerList_::ReplaceItem(index, (void *)item);
}

template<class T>
T *
BObjectList<T>::SwapWithItem(int32 index, T *newItem)
{
	T *result = ItemAt(index);
	_PointerList_::ReplaceItem(index, (void *)newItem);
	return result;
}

template<class T>
void 
BObjectList<T>::SetItem(int32 index, T *newItem)
{
	_PointerList_::ReplaceItem(index, (void *)newItem);
}

template<class T> 
int32 
BObjectList<T>::IndexOf(const T *item) const
{
	return _PointerList_::IndexOf((void *)item);
}

template<class T> 
T *
BObjectList<T>::FirstItem() const
{
	return (T *)_PointerList_::FirstItem();
}

template<class T> 
T *
BObjectList<T>::LastItem() const
{
	return (T *)_PointerList_::LastItem();
}

template<class T> 
bool 
BObjectList<T>::HasItem(const T *item) const
{
	return _PointerList_::HasItem((void *)item);
}

template<class T> 
bool 
BObjectList<T>::IsEmpty() const
{
	return _PointerList_::IsEmpty();
}

template<class T> 
int32 
BObjectList<T>::CountItems() const
{
	return _PointerList_::CountItems();
}

template<class T> 
void 
BObjectList<T>::MakeEmpty()
{
	if (owning) {
		int32 count = CountItems();
		for (int32 index = 0; index < count; index++)
			delete ItemAt(index);
	}
	_PointerList_::MakeEmpty();
}

template<class T> 
T *
BObjectList<T>::EachElement(EachFunction func, void *params)
{ 
	return (T *)_PointerList_::EachElement((GenericEachFunction)func, params); 
}


template<class T> 
const T *
BObjectList<T>::EachElement(ConstEachFunction func, void *params) const
{ 
	return (const T *)
		const_cast<BObjectList<T> *>(this)->_PointerList_::EachElement(
		(GenericEachFunction)func, params); 
}

template<class T>
const T *
BObjectList<T>::FindIf(const UnaryPredicate<T> &predicate) const
{
	int32 count = CountItems();
	for (int32 index = 0; index < count; index++)
		if (predicate.operator()(ItemAt(index)) == 0)
			return ItemAt(index);
	return 0;
}

template<class T>
T *
BObjectList<T>::FindIf(const UnaryPredicate<T> &predicate)
{
	int32 count = CountItems();
	for (int32 index = 0; index < count; index++)
		if (predicate.operator()(ItemAt(index)) == 0)
			return ItemAt(index);
	return 0;
}


template<class T> 
void
BObjectList<T>::SortItems(CompareFunction function)
{ 
	_PointerList_::SortItems((GenericCompareFunction)function); 
}

template<class T>
void 
BObjectList<T>::SortItems(CompareFunctionWithState function, void *state)
{
	_PointerList_::SortItems((GenericCompareFunctionWithState)function, state); 
}

template<class T> 
void
BObjectList<T>::HSortItems(CompareFunction function)
{ 
	_PointerList_::HSortItems((GenericCompareFunction)function); 
}

template<class T>
void 
BObjectList<T>::HSortItems(CompareFunctionWithState function, void *state)
{
	_PointerList_::HSortItems((GenericCompareFunctionWithState)function, state); 
}

template<class T>
const T *
BObjectList<T>::BinarySearch(const T &key, CompareFunction func) const
{
	return (const T *)_PointerList_::BinarySearch(&key,
		(GenericCompareFunction)func);
}

template<class T>
const T *
BObjectList<T>::BinarySearch(const T &key, CompareFunctionWithState func, void *state) const
{
	return (const T *)_PointerList_::BinarySearch(&key,
		(GenericCompareFunctionWithState)func, state);
}

template<class T>
bool
BObjectList<T>::BinaryInsert(T *item, CompareFunction func)
{
	int32 index = _PointerList_::BinarySearchIndex(item,
		(GenericCompareFunction)func);
	if (index >= 0) {
		// already in list, add after existing
		return AddItem(item, index + 1);
	}

	return AddItem(item, -index - 1);
}

template<class T>
bool
BObjectList<T>::BinaryInsert(T *item, CompareFunctionWithState func, void *state)
{
	int32 index = _PointerList_::BinarySearchIndex(item,
		(GenericCompareFunctionWithState)func, state);
	if (index >= 0) {
		// already in list, add after existing
		return AddItem(item, index + 1);
	}

	return AddItem(item, -index - 1);
}

template<class T>
bool 
BObjectList<T>::BinaryInsertUnique(T *item, CompareFunction func)
{
	int32 index = _PointerList_::BinarySearchIndex(item,
		(GenericCompareFunction)func);
	if (index >= 0)
		return false;

	return AddItem(item, -index - 1);
}

template<class T>
bool 
BObjectList<T>::BinaryInsertUnique(T *item, CompareFunctionWithState func, void *state)
{
	int32 index = _PointerList_::BinarySearchIndex(item,
		(GenericCompareFunctionWithState)func, state);
	if (index >= 0)
		return false;

	return AddItem(item, -index - 1);
}


template<class T>
T *
BObjectList<T>::BinaryInsertCopy(const T &copyThis, CompareFunction func)
{
	int32 index = _PointerList_::BinarySearchIndex(&copyThis,
		(GenericCompareFunction)func);

	if (index >= 0)
		index++;
	else
		index = -index - 1;
		
	T *newItem = new T(copyThis);
	AddItem(newItem, index);
	return newItem;
}

template<class T>
T *
BObjectList<T>::BinaryInsertCopy(const T &copyThis, CompareFunctionWithState func, void *state)
{
	int32 index = _PointerList_::BinarySearchIndex(&copyThis,
		(GenericCompareFunctionWithState)func, state);

	if (index >= 0)
		index++;
	else
		index = -index - 1;

	T *newItem = new T(copyThis);
	AddItem(newItem, index);
	return newItem;
}

template<class T>
T *
BObjectList<T>::BinaryInsertCopyUnique(const T &copyThis, CompareFunction func)
{
	int32 index = _PointerList_::BinarySearchIndex(&copyThis,
		(GenericCompareFunction)func);
	if (index >= 0)
		return ItemAt(index);
	
	index = -index - 1;
	T *newItem = new T(copyThis);
	AddItem(newItem, index);
	return newItem;
}

template<class T>
T *
BObjectList<T>::BinaryInsertCopyUnique(const T &copyThis, CompareFunctionWithState func,
	void *state)
{
	int32 index = _PointerList_::BinarySearchIndex(&copyThis,
		(GenericCompareFunctionWithState)func, state);
	if (index >= 0)
		return ItemAt(index);
	
	index = -index - 1;
	T *newItem = new T(copyThis);
	AddItem(newItem, index);
	return newItem;
}

template<class T>
int32 
BObjectList<T>::FindBinaryInsertionIndex(const UnaryPredicate<T> &pred, bool *alreadyInList)
	const
{
	int32 index = _PointerList_::BinarySearchIndexByPredicate(&pred,
		(UnaryPredicateGlue)&UnaryPredicate<T>::_unary_predicate_glue);
	
	if (alreadyInList)
		*alreadyInList = index >= 0;

	if (index < 0) 
		index = -index - 1;
	
	return index;
}

template<class T>
bool
BObjectList<T>::BinaryInsert(T *item, const UnaryPredicate<T> &pred)
{
	return AddItem(item, FindBinaryInsertionIndex(pred));
}

template<class T>
bool
BObjectList<T>::BinaryInsertUnique(T *item, const UnaryPredicate<T> &pred)
{
	bool alreadyInList;
	int32 index = FindBinaryInsertionIndex(pred, &alreadyInList);
	if (alreadyInList)
		return false;

	AddItem(item, index);
	return true;
}

#endif	/* __OBJECT_LIST__ */