haiku/headers/os/support/ObjectList.h

/*
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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:

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and shall be included in all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF TITLE, MERCHANTABILITY,
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All rights reserved.
*/
#ifndef _OBJECT_LIST_H
#define _OBJECT_LIST_H


#include <new>

#include <List.h>
#include <SupportDefs.h>


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

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 *);
	bool MoveItem(int32 from, int32 to);

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
			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(bool deleteIfOwning = true);

								// 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
			bool				MoveItem(int32 from, int32 to);

			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
			T*					BinarySearch(const T&, CompareFunction) const;
			T*					BinarySearch(const T&, CompareFunctionWithState,
									void* state) const;

			template<typename Key>
			T*					BinarySearchByKey(const Key& key,
									int (*compare)(const Key*, const T*)) const;

			template<typename Key>
			T*					BinarySearchByKey(const Key& key,
									int (*compare)(const Key*, const T*, void*),
									void* state) const;

			int32				BinarySearchIndex(const T&item,
									CompareFunction compare) const;
			int32				BinarySearchIndex(const T&item,
									CompareFunctionWithState compare,
									void* state) const;

			template<typename Key>
			int32				BinarySearchIndexByKey(const Key& key,
									int (*compare)(const Key*, const T*)) 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

			class Private;
private:
	friend	class 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 (std::nothrow) 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 (std::nothrow) 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 index)
{
	return _PointerList_::AddItem((void*)item, index);
}


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


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


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* item)
{
	T* result = ItemAt(index);
	_PointerList_::ReplaceItem(index, (void*)item);

	return result;
}


template<class T>
bool
BObjectList<T>::MoveItem(int32 from, int32 to)
{
	return _PointerList_::MoveItem(from, to);
}


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(bool deleteIfOwning)
{
	if (owning && deleteIfOwning) {
		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>
T*
BObjectList<T>::BinarySearch(const T& key, CompareFunction func) const
{
	return (T*)_PointerList_::BinarySearch(&key, (GenericCompareFunction)func);
}


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


template<class T>
template<typename Key>
T*
BObjectList<T>::BinarySearchByKey(const Key& key,
	int (*compare)(const Key*, const T*)) const
{
	return (T*)_PointerList_::BinarySearch(&key,
		(GenericCompareFunction)compare);
}


template<class T>
template<typename Key>
T*
BObjectList<T>::BinarySearchByKey(const Key &key,
	int (*compare)(const Key*, const T*, void*), void* state) const
{
	return (T*)_PointerList_::BinarySearch(&key,
		(GenericCompareFunctionWithState)compare, state);
}


template<class T>
int32
BObjectList<T>::BinarySearchIndex(const T& item, CompareFunction compare) const
{
	return _PointerList_::BinarySearchIndex(&item,
		(GenericCompareFunction)compare);
}


template<class T>
int32
BObjectList<T>::BinarySearchIndex(const T& item,
	CompareFunctionWithState compare, void* state) const
{
	return _PointerList_::BinarySearchIndex(&item,
		(GenericCompareFunctionWithState)compare, state);
}


template<class T>
template<typename Key>
int32
BObjectList<T>::BinarySearchIndexByKey(const Key& key,
	int (*compare)(const Key*, const T*)) const
{
	return _PointerList_::BinarySearchIndex(&key,
		(GenericCompareFunction)compare);
}


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 (std::nothrow) 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 (std::nothrow) 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 (std::nothrow) 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 (std::nothrow) 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_H