lwes_hash.h

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/*======================================================================*
 * Copyright (C) 2008 Light Weight Event System                         *
 * All rights reserved.                                                 *
 *                                                                      *
 * 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.                                  *
 *                                                                      *
 * 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.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with this program; if not, write to the Free Software          *
 * Foundation, Inc., 51 Franklin Street, Fifth Floor,                   *
 * Boston, MA 02110-1301 USA.                                           *
 *======================================================================*/
#ifndef __LWES_HASH_H
#define __LWES_HASH_H

#include <stdlib.h>
#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif 

struct lwes_hash
{
  void **bins;
  int total_bins;
  int assigned_entries;
};

struct lwes_hash_element
{
  char * key;
  void * value;
  struct lwes_hash_element *next;
};

struct lwes_hash_enumeration
{
  int index;
  int elements_given;
  int size_at_start;  /* in case we are using this enumeration to remove all the
                         elements in the hash */
  struct lwes_hash *enum_hash;
  struct lwes_hash_element *current;
};

struct lwes_hash *
lwes_hash_create
  (void);

struct lwes_hash *
lwes_hash_create_with_bins
  (int total_bins);

int
lwes_hash_destroy
  (struct lwes_hash* hash);

int
lwes_hash_is_empty
  (struct lwes_hash* hash);

int
lwes_hash_size
  (struct lwes_hash* hash);

int
lwes_hash_rehash
  (struct lwes_hash* hash);

int
lwes_hash_put
  (struct lwes_hash* hash,
   char *key,
   void *value);

void *
lwes_hash_get
  (struct lwes_hash* hash,
   const char *key);

void *
lwes_hash_remove
  (struct lwes_hash* hash,
   const char *key);

int
lwes_hash_contains_key
  (struct lwes_hash* hash,
   const char *key);

int
lwes_hash_keys
  (struct lwes_hash * hash,
   struct lwes_hash_enumeration *enumeration);

int
lwes_hash_enumeration_has_more_elements
  (struct lwes_hash_enumeration *enumeration);

char *
lwes_hash_enumeration_next_element
  (struct lwes_hash_enumeration *enumeration);

#ifdef __cplusplus
}
#endif 

#endif /* __LWES_HASH_H */

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