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/**
* @file linked_list.h
*
* @brief Interface of linked_list_t.
*
*/
/*
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* 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; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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 LINKED_LIST_H_
#define LINKED_LIST_H_
#include <pthread.h>
#include <types.h>
#include <utils/iterator.h>
typedef struct linked_list_t linked_list_t;
/**
* @brief Class implementing a double linked list.
*
* General purpose linked list. This list is not synchronized.
*
* @b Costructors:
* - linked_list_create()
*
* @ingroup utils
*/
struct linked_list_t {
/**
* @brief Gets the count of items in the list.
*
* @param linked_list calling object
* @return number of items in list
*/
int (*get_count) (linked_list_t *linked_list);
/**
* @brief Creates a iterator for the given list.
*
* @warning Created iterator_t object has to get destroyed by the caller.
*
* @param linked_list calling object
* @param forward iterator direction (TRUE: front to end)
* @return new iterator_t object
*/
iterator_t *(*create_iterator) (linked_list_t *linked_list, bool forward);
/**
* @brief Creates a iterator, locking a mutex.
*
* The supplied mutex is acquired immediately, and released
* when the iterator gets destroyed.
*
* @param linked_list calling object
* @param mutex mutex to use for exclusive access
* @return new iterator_t object
*/
iterator_t *(*create_iterator_locked) (linked_list_t *linked_list,
pthread_mutex_t *mutex);
/**
* @brief Inserts a new item at the beginning of the list.
*
* @param linked_list calling object
* @param[in] item item value to insert in list
*/
void (*insert_first) (linked_list_t *linked_list, void *item);
/**
* @brief Removes the first item in the list and returns its value.
*
* @param linked_list calling object
* @param[out] item returned value of first item, or NULL
* @return
* - SUCCESS
* - NOT_FOUND, if list is empty
*/
status_t (*remove_first) (linked_list_t *linked_list, void **item);
/**
* @brief Returns the value of the first list item without removing it.
*
* @param linked_list calling object
* @param[out] item item returned value of first item
* @return
* - SUCCESS
* - NOT_FOUND, if list is empty
*/
status_t (*get_first) (linked_list_t *linked_list, void **item);
/**
* @brief Inserts a new item at the end of the list.
*
* @param linked_list calling object
* @param[in] item item value to insert into list
*/
void (*insert_last) (linked_list_t *linked_list, void *item);
/**
* @brief Inserts a new item at a given position in the list.
*
* @param linked_list calling object
* @param position position starting at 0 to insert new entry
* @param[in] item item value to insert into list
* @return
* - SUCCESS
* - INVALID_ARG if position not existing
*/
status_t (*insert_at_position) (linked_list_t *linked_list,size_t position, void *item);
/**
* @brief Removes an item from a given position in the list.
*
* @param linked_list calling object
* @param position position starting at 0 to remove entry from
* @param[out] item removed item will be stored at this location
* @return
* - SUCCESS
* - INVALID_ARG if position not existing
*/
status_t (*remove_at_position) (linked_list_t *linked_list,size_t position, void **item);
/**
* @brief Get an item from a given position in the list.
*
* @param linked_list calling object
* @param position position starting at 0 to get entry from
* @param[out] item item will be stored at this location
* @return
* - SUCCESS
* - INVALID_ARG if position not existing
*/
status_t (*get_at_position) (linked_list_t *linked_list,size_t position, void **item);
/**
* @brief Removes the last item in the list and returns its value.
*
* @param linked_list calling object
* @param[out] item returned value of last item, or NULL
* @return
* - SUCCESS
* - NOT_FOUND if list is empty
*/
status_t (*remove_last) (linked_list_t *linked_list, void **item);
/**
* @brief Returns the value of the last list item without removing it.
*
* @param linked_list calling object
* @param[out] item returned value of last item
* @return
* - SUCCESS
* - NOT_FOUND if list is empty
*/
status_t (*get_last) (linked_list_t *linked_list, void **item);
/**
* @brief Destroys a linked_list object.
*
* @warning All items are removed before deleting the list. The
* associated values are NOT destroyed.
* Destroying an list which is not empty may cause
* memory leaks!
*
* @param linked_list calling object
*/
void (*destroy) (linked_list_t *linked_list);
};
/**
* @brief Creates an empty linked list object.
*
* @return linked_list_t object.
*
* @ingroup utils
*/
linked_list_t *linked_list_create(void);
#endif /*LINKED_LIST_H_*/
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