/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the Qt3Support module of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

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** $QT_END_LICENSE$

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****************************************************************************/

#ifndef Q3GLIST_H

#define Q3GLIST_H

#include <Qt3Support/q3ptrcollection.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Qt3SupportLight)

class Q_COMPAT_EXPORT Q3LNode

{

friend class Q3GList;

friend class Q3GListIterator;

friend class Q3GListStdIterator;

public:

    Q3PtrCollection::Item getData()	{ return data; }

private:

    Q3PtrCollection::Item data;

    Q3LNode *prev;

    Q3LNode *next;

    Q3LNode( Q3PtrCollection::Item d ) { data = d; }

};

class Q3GListIteratorList; // internal helper class

class Q_COMPAT_EXPORT Q3GList : public Q3PtrCollection	// doubly linked generic list

{

friend class Q3GListIterator;

friend class Q3GListIteratorList;

friend class Q3GVector;				// needed by Q3GVector::toList

public:

    uint  count() const;			// return number of nodes

#ifndef QT_NO_DATASTREAM

    QDataStream &read( QDataStream & );		// read list from stream

    QDataStream &write( QDataStream & ) const;	// write list to stream

#endif

protected:

    Q3GList();					// create empty list

    Q3GList( const Q3GList & );			// make copy of other list

    virtual ~Q3GList();

    Q3GList &operator=( const Q3GList & );	// assign from other list

    bool operator==( const Q3GList& ) const;

    void inSort( Q3PtrCollection::Item );		// add item sorted in list

    void append( Q3PtrCollection::Item );		// add item at end of list

    bool insertAt( uint index, Q3PtrCollection::Item ); // add item at i'th position

    void relinkNode( Q3LNode * );		// relink as first item

    bool removeNode( Q3LNode * );		// remove node

    bool remove( Q3PtrCollection::Item = 0 );	// remove item (0=current)

    bool removeRef( Q3PtrCollection::Item = 0 );	// remove item (0=current)

    bool removeFirst();				// remove first item

    bool removeLast();				// remove last item

    bool removeAt( uint );			// remove item at i'th position

    bool replaceAt( uint, Q3PtrCollection::Item ); // replace item at position i with item

    Q3PtrCollection::Item takeNode( Q3LNode * );	// take out node

    Q3PtrCollection::Item take();		// take out current item

    Q3PtrCollection::Item takeAt( uint index );	// take out item at i'th pos

    Q3PtrCollection::Item takeFirst();		// take out first item

    Q3PtrCollection::Item takeLast();		// take out last item

    void sort();                        	// sort all items;

    void clear();				// remove all items

    int	 findRef( Q3PtrCollection::Item, bool = true ); // find exact item in list

    int	 find( Q3PtrCollection::Item, bool = true ); // find equal item in list

    uint containsRef( Q3PtrCollection::Item ) const;	// get number of exact matches

    uint contains( Q3PtrCollection::Item ) const;	// get number of equal matches

    Q3PtrCollection::Item at( uint index );	// access item at i'th pos

    int	  at() const;				// get current index

    Q3LNode *currentNode() const;		// get current node

    Q3PtrCollection::Item get() const;		// get current item

    Q3PtrCollection::Item cfirst() const;	// get ptr to first list item

    Q3PtrCollection::Item clast()  const;	// get ptr to last list item

    Q3PtrCollection::Item first();		// set first item in list curr

    Q3PtrCollection::Item last();		// set last item in list curr

    Q3PtrCollection::Item next();		// set next item in list curr

    Q3PtrCollection::Item prev();		// set prev item in list curr

    void  toVector( Q3GVector * ) const;		// put items in vector

    virtual int compareItems( Q3PtrCollection::Item, Q3PtrCollection::Item );

#ifndef QT_NO_DATASTREAM

    virtual QDataStream &read( QDataStream &, Q3PtrCollection::Item & );

    virtual QDataStream &write( QDataStream &, Q3PtrCollection::Item ) const;

#endif

    Q3LNode* begin() const { return firstNode; }

    Q3LNode* end() const { return 0; }

    Q3LNode* erase( Q3LNode* it );

private:

    void  prepend( Q3PtrCollection::Item );	// add item at start of list

    void heapSortPushDown( Q3PtrCollection::Item* heap, int first, int last );

    Q3LNode *firstNode;				// first node

    Q3LNode *lastNode;				// last node

    Q3LNode *curNode;				// current node

    int curIndex;				// current index

    uint numNodes;				// number of nodes

    Q3GListIteratorList *iterators; 		// list of iterators

    Q3LNode *locate( uint );			// get node at i'th pos

    Q3LNode *unlink();				// unlink node

};

inline uint Q3GList::count() const

{

    return numNodes;

}

inline bool Q3GList::removeFirst()

{

    first();

    return remove();

}

inline bool Q3GList::removeLast()

{

    last();

    return remove();

}

inline int Q3GList::at() const

{

    return curIndex;

}

inline Q3PtrCollection::Item Q3GList::at( uint index )

{

    Q3LNode *n = locate( index );

    return n ? n->data : 0;

}

inline Q3LNode *Q3GList::currentNode() const

{

    return curNode;

}

inline Q3PtrCollection::Item Q3GList::get() const

{

    return curNode ? curNode->data : 0;

}

inline Q3PtrCollection::Item Q3GList::cfirst() const

{

    return firstNode ? firstNode->data : 0;

}

inline Q3PtrCollection::Item Q3GList::clast() const

{

    return lastNode ? lastNode->data : 0;

}

/*****************************************************************************

  Q3GList stream functions

 *****************************************************************************/

#ifndef QT_NO_DATASTREAM

Q_COMPAT_EXPORT QDataStream &operator>>( QDataStream &, Q3GList & );

Q_COMPAT_EXPORT QDataStream &operator<<( QDataStream &, const Q3GList & );

#endif

/*****************************************************************************

  Q3GListIterator class

 *****************************************************************************/

class Q_COMPAT_EXPORT Q3GListIterator			// Q3GList iterator

{

friend class Q3GList;

friend class Q3GListIteratorList;

protected:

    Q3GListIterator( const Q3GList & );

    Q3GListIterator( const Q3GListIterator & );

    Q3GListIterator &operator=( const Q3GListIterator & );

   ~Q3GListIterator();

    bool  atFirst() const;			// test if at first item

    bool  atLast()  const;			// test if at last item

    Q3PtrCollection::Item	  toFirst();				// move to first item

    Q3PtrCollection::Item	  toLast();				// move to last item

    Q3PtrCollection::Item	  get() const;				// get current item

    Q3PtrCollection::Item	  operator()();				// get current and move to next

    Q3PtrCollection::Item	  operator++();				// move to next item (prefix)

    Q3PtrCollection::Item	  operator+=(uint);			// move n positions forward

    Q3PtrCollection::Item	  operator--();				// move to prev item (prefix)

    Q3PtrCollection::Item	  operator-=(uint);			// move n positions backward

protected:

    Q3GList *list;				// reference to list

private:

    Q3LNode  *curNode;				// current node in list

};

inline bool Q3GListIterator::atFirst() const

{

    return curNode == list->firstNode;

}

inline bool Q3GListIterator::atLast() const

{

    return curNode == list->lastNode;

}

inline Q3PtrCollection::Item Q3GListIterator::get() const

{

    return curNode ? curNode->data : 0;

}

class Q_COMPAT_EXPORT Q3GListStdIterator

{

public:

    inline Q3GListStdIterator( Q3LNode* n ) : node( n ){}

    inline operator Q3LNode* () { return node; }

protected:

    inline Q3LNode *next() { return node->next; }

    Q3LNode *node;

};

QT_END_NAMESPACE

QT_END_HEADER

#endif	// Q3GLIST_H