/******************************************************************************
 * listkey.h	- code for base class 'listkey'.  listkey is the basis for all
 *				types of keys for indexing into modules
 *				(e.g. verse, word,
 *				place, etc.)
 *
 * $Id: listkey.h,v 1.14 2002/08/27 22:52:36 scribe Exp $
 *
 * Copyright 1998 CrossWire Bible Society (http://www.crosswire.org)
 *	CrossWire Bible Society
 *	P. O. Box 2528
 *	Tempe, AZ  85280-2528
 *
 * 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 version 2.
 *
 * 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.
 *
 */

#ifndef SWLSTKEY_H
#define SWLSTKEY_H

#include <swkey.h>

#include <defs.h>

  /** ListKey is the basis for all
  * types of keys that have lists of specified indexes
  * (e.g. a list of verses, place, etc.)
  */
class SWDLLEXPORT ListKey : public SWKey {

  static SWClass classdef;
  void init ();
protected:
  int arraypos;
  int arraymax;
  int arraycnt;
  SWKey **array;
public:
	/** initializes instance of ListKey
	*
	* @param ikey text key
	*/
	ListKey (const char *ikey = 0);
	ListKey (ListKey const &k);
	/** cleans up instance of ListKey
	*/
	virtual ~ ListKey ();

	virtual SWKey *clone () const;
	/** Clears out elements of list
	*/
	virtual void ClearList ();
	/** Returns number of elements in list
	* @return number of elements in list
	*/
	virtual int Count ();
	/** Removes current element from list
	*/
	virtual void Remove ();
	/** Sets key to element number
	*
	* @param ielement element number to set to
	* @return error status
	*/
	virtual char SetToElement (int ielement, SW_POSITION = TOP);
	/** Gets a key element number
	*
	* @param pos element number to get (or default current)
	* @return Key or null on error
	*/
	virtual SWKey *GetElement (int pos = -1);
	/** Adds an element to the list
	* @param ikey the element to add
	*/
	ListKey & operator << (const SWKey &ikey) { add(ikey); return *this; }
	virtual void add(const SWKey &ikey);

	/** Equates this ListKey to another ListKey object
	*
	* @param ikey other ListKey object
	*/
	virtual void copyFrom(const ListKey & ikey);
	virtual void copyFrom(const SWKey & ikey) { SWKey::copyFrom(ikey); }

	/** Positions this key
	*
	* @param p position
	* @return *this
	*/
	virtual void setPosition(SW_POSITION);
	/** Decrements a number of elements
	*/
	virtual void decrement(int step);
	/** Increments a number of elements
	*/
	virtual void increment(int step);

	virtual char Traversable () { return 1; }
	virtual long Index () const { return arraypos; }
	virtual const char *getRangeText() const;

	/**
	* Returns the index for the new one given as as parameter.
	* The first parameter is the new index.
	*/
	virtual long Index (long index) { SetToElement (index); return Index (); }

	SWKEY_OPERATORS
	ListKey & operator =(const ListKey &key) { copyFrom(key); return *this; }
};


#endif