/*                                           W3C Sample Code Library libwww Association Pairs
                      ASSOCIATION LIST FOR STORING NAME-VALUE PAIRS
                                             
 */
/*
**      (c) COPYRIGHT MIT 1995.
**      Please first read the full copyright statement in the file COPYRIGH.
*/
/*

   This Assoctiation List class is closely related to the HTList Class as it simply is a
   list of a specific list element containing a characters based name/value pair. Lookups
   from association list are _not case-sensitive_.
   
   This module is implemented by HTAssoc.c, and it is a part of the W3C Sample Code
   Library.
   
 */
#ifndef HTASSOC_H
#define HTASSOC_H

#include "HTList.h"

typedef HTList HTAssocList;

typedef struct {
    char * name;
    char * value;
} HTAssoc;
/*

  Creation and Deletetion Methods
  
   These methods create and deletes and association list
   
 */
extern HTAssocList * HTAssocList_new (void);
extern BOOL          HTAssocList_delete (HTAssocList * alist);
/*

  Add an Element to a List
  
   We have two methods for adding new elements - you can either add unconditionally _or_
   replace any existing element with the same name but a new value. A new list element is
   added to the beginning of the list so that it is the first element just after the head
   element.
   
 */
extern BOOL HTAssocList_addObject (HTAssocList * alist,
                                   const char * name, const char * value);

extern BOOL HTAssocList_replaceObject (HTAssocList * list,
                                       const char * name, const char * value);
/*

  Remove an Element from a List
  
   Remove the element with the given name from the list.
   
 */
extern BOOL HTAssocList_removeObject (HTAssocList * list, const char * name);
/*

  Search for Elements in a list
  
   We have a small set of methods for searching a specific element within a list.
   
 */
extern char * HTAssocList_findObject (HTAssocList * alist, const char * name);
/*

  Get Name and Values
  
   Use this to get the name and value of a assoc object
   
 */
#define HTAssoc_name(me)        ((me) ? (me)->name : NULL)
#define HTAssoc_value(me)       ((me) ? (me)->value : NULL)
/*

  Traverse list
  
   Fast macro to traverse the list. Call it first with copy of list header: it returns the
   first object and increments the passed list pointer. Call it with the same variable
   until it returns NULL.
   
 */
#define HTAssocList_nextObject(me) \
        ((me) && ((me) = (me)->next) ? (me)->object : NULL)
/*

 */
#endif /* not HTASSOC_H */
/*

   
   ___________________________________
   
                           @(#) $Id: HTAssoc.html,v 2.16 1997/02/16 18:41:58 frystyk Exp $
                                                                                          
    */