util_list.h

/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code 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; either version 2 of the License,
or (at your option) any later version.

Quake III Arena source code 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.

You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
#ifndef __UTIL_LIST_H__
#define __UTIL_LIST_H__

#include <stdlib.h>
#include <assert.h>

template< class type >
class idList {
private:
	int			m_num;
	int			m_size;
	int			m_granularity;
	type		*m_list;

public:
				idList( int granularity = 16 );
				~idList<type>();
	void		Clear( void );
	int			Num( void );
	void		SetNum( int num );
	void		SetGranularity( int granularity );
	void		Condense( void );
	int			Size( void );
	void		Resize( int size );
	type		operator[]( int index ) const;
	type		&operator[]( int index );
	int			Append( type const & obj );
	int			AddUnique( type const & obj );
	type		*Find( type const & obj, int *index = NULL );
	bool		RemoveIndex( int index );
	bool		Remove( type const & obj );
	typedef int cmp_t(const void *, const void *);
	void		Sort( cmp_t *compare );
};

/*
================
idList<type>::idList( int )
================
*/
template< class type >
inline idList<type>::idList( int granularity ) {
	assert( granularity > 0 );

	m_list			= NULL;
	m_granularity	= granularity;
	Clear();
}

/*
================
idList<type>::~idList<type>
================
*/
template< class type >
inline idList<type>::~idList() {
	Clear();
}

/*
================
idList<type>::Clear
================
*/
template< class type >
inline void idList<type>::Clear( void ) {
	if ( m_list ) {
		delete[] m_list;
	}

	m_list	= NULL;
	m_num	= 0;
	m_size	= 0;
}

/*
================
idList<type>::Num
================
*/
template< class type >
inline int idList<type>::Num( void ) {
	return m_num;
}

/*
================
idList<type>::SetNum
================
*/
template< class type >
inline void idList<type>::SetNum( int num ) {
	assert( num >= 0 );
	if ( num > m_size ) {
		// resize it up to the closest level of granularity
		Resize( ( ( num + m_granularity - 1 ) / m_granularity ) * m_granularity );
	}
	m_num = num;
}

/*
================
idList<type>::SetGranularity
================
*/
template< class type >
inline void idList<type>::SetGranularity( int granularity ) {
	int newsize;

	assert( granularity > 0 );
	m_granularity = granularity;

	if ( m_list ) {
		// resize it to the closest level of granularity
		newsize = ( ( m_num + m_granularity - 1 ) / m_granularity ) * m_granularity;
		if ( newsize != m_size ) {
			Resize( newsize );
		}
	}
}

/*
================
idList<type>::Condense

Resizes the array to exactly the number of elements it contains
================
*/
template< class type >
inline void idList<type>::Condense( void ) {
	if ( m_list ) {
		if ( m_num ) {
			Resize( m_num );
		} else {
			Clear();
		}
	}
}

/*
================
idList<type>::Size
================
*/
template< class type >
inline int idList<type>::Size( void ) {
	return m_size;
}

/*
================
idList<type>::Resize
================
*/
template< class type >
inline void idList<type>::Resize( int size ) {
	type	*temp;
	int		i;

	assert( size > 0 );

	if ( size <= 0 ) {
		Clear();
		return;
	}

	temp	= m_list;
	m_size	= size;
	if ( m_size < m_num ) {
		m_num = m_size;
	}

	m_list = new type[ m_size ];
	for( i = 0; i < m_num; i++ ) {
		m_list[ i ] = temp[ i ];
	}

	if ( temp ) {
		delete[] temp;
	}
}

/*
================
idList<type>::operator[] const
================
*/
template< class type >
inline type idList<type>::operator[]( int index ) const {
	assert( index >= 0 );
	assert( index < m_num );

	return m_list[ index ];
}

/*
================
idList<type>::operator[]
================
*/
template< class type >
inline type &idList<type>::operator[]( int index ) {
	assert( index >= 0 );
	assert( index < m_num );

	return m_list[ index ];
}

/*
================
idList<type>::Append
================
*/
template< class type >
inline int idList<type>::Append( type const & obj ) {
	if ( !m_list ) {
		Resize( m_granularity );
	}

	if ( m_num == m_size ) {
		Resize( m_size + m_granularity );
	}

	m_list[ m_num ] = obj;
	m_num++;

	return m_num - 1;
}

/*
================
idList<type>::AddUnique
================
*/
template< class type >
inline int idList<type>::AddUnique( type const & obj ) {
	int index;

	if ( !Find( obj, &index ) ) {
		index = Append( obj );
	}

	return index;
}

/*
================
idList<type>::Find
================
*/
template< class type >
inline type *idList<type>::Find( type const & obj, int *index ) {
	int i;

	for( i = 0; i < m_num; i++ ) {
		if ( m_list[ i ] == obj ) {
			if ( index ) {
				*index = i;
			}
			return &m_list[ i ];
		}
	}

	return NULL;
}

/*
================
idList<type>::RemoveIndex
================
*/
template< class type >
inline bool idList<type>::RemoveIndex( int index ) {
	int i;

	if ( !m_list || !m_num ) {
		return false;
	}

	assert( index >= 0 );
	assert( index < m_num );

	if ( ( index < 0 ) || ( index >= m_num ) ) {
		return false;
	}

	m_num--;
	for( i = index; i < m_num; i++ ) {
		m_list[ i ] = m_list[ i + 1 ];
	}

	return true;
}

/*
================
idList<type>::Remove
================
*/
template< class type >
inline bool idList<type>::Remove( type const & obj ) {
	int index;

	if ( Find( obj, &index ) ) {
		return RemoveIndex( index );
	}
	
	return false;
}

/*
================
idList<type>::Sort
================
*/
template< class type >
inline void idList<type>::Sort( cmp_t *compare ) {
	if ( !m_list ) {
		return;
	}

	qsort( ( void * )m_list, ( size_t )m_num, sizeof( type ), compare );
}

#endif /* !__UTIL_LIST_H__ */