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Thu May 14 02:11:15 1998 UTC (26 years ago) by frystyk
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CVS tags: repeat-requests, before_webdav, Release-5-4-0, Release-5-3-1, Release-5-2-8, Release-5-2-6, Release-5-2, Release-5-1m, HEAD, Before-New-Trace-Messages, Amaya_2_4, Amaya-6-3, Amaya-6-1, Amaya-5-2, Amaya-4-3-2, Amaya-4-3-1, Amaya-4-3, Amaya-4-1-2, Amaya-4-1-0, Amaya-4-0-0, Amaya-3-2-1, Amaya-3-2, Amaya
Changing old pub/WWW links

<HTML>
<HEAD>
<!-- Changed by: Henrik Frystyk Nielsen,  7-Jul-1996 -->
  <TITLE>W3C Sample Code Library libwww URL Tress</TITLE>
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<BODY>
<H1>
  URL Trees
</H1>
<PRE>
/*
**	(c) COPYRIGHT MIT 1995.
**	Please first read the full copyright statement in the file COPYRIGH.
*/
</PRE>
<P>
A <I>URL tree</I> is a hierarchical container class that is well suited for
storing information about a URL hierarchy. The <I>root</I> of a URL tree
is the <I>hostname</I> part of the URL, for example
<CODE>www.w3.org:8000</CODE>.&nbsp;Client application can use URL trees to
store what they know about remote servers, for example the access authentication,
PICS labels and PEP modules required to access a specific URL from a remote
server. However, URL trees can also be used on server side to contain information
about the server tree, for example what parts of the tree is protected etc.
<P>
There are three components of the URL tree which all can be searched for
using the methods declared in this module.
<UL>
  <LI>
    The Tree itself
  <LI>
    A URL Node which represents a hierarchy level in a URL
  <LI>
    A URL Template which can span multiple nodes and are very similar to the
    realms known from for example Basic Access Authentication in HTTP.
</UL>
<P>
Typically, a URL tree will be empty when the application starts and as time
goes by and we get to know more about the remote servers that we have access,
the URL trees will contain more and more information. A nice feature about
URL trees is that the application can interpolate information based on realms
and templates. This gives the application a good chance of guessing what
information (for example a set of credentials) should be appended to a new
request.
<P>
We do not currently distinguish between multiple access mechanisms, for example
<B>HTTP</B> and <B>FTP</B>, however, URL trees are mostly used within the
HTTP domain.
<P>
<I>URL Trees</I> are often used by <A HREF="HTFilter.html">filters</A> which
stores information about remote services, Each filter can have its own URL
tree&nbsp;<I>or</I> a URL tree can be shared among multiple filters.
<P>
This module is implemented by <A HREF="HTUTree.c">HTUTree.c</A>, and it is
a part of the <A HREF="http://www.w3.org/Library/"> W3C Sample Code
Library</A>.
<PRE>
#ifndef HTUTREE_H
#define HTUTREE_H
#include "HTReq.h"
</PRE>
<H2>
  URL Trees
</H2>
<P>
The three parts of a URL tree are called
<PRE>
typedef struct _HTUTree     HTUTree;
typedef struct _HTURealm     HTURealm;
typedef struct _HTUTemplate HTUTemplate;
</PRE>
<H3>
  Create a URL Tree
</H3>
<P>
Create a new authentication base Returns new object or NULL if error
<PRE>

typedef int HTUTree_gc		(void * context);

extern HTUTree * HTUTree_new (const char * 		root,
			      const char * 		host,
			      int 			port,
			      HTUTree_gc *	 	gc);
</PRE>
<H3>
  Delete a URL Tree
</H3>
<P>
Delete a complete server tree and everything within it.
<PRE>
extern BOOL HTUTree_delete (const char * 	root,
			    const char * 	host,
			    int			port);
</PRE>
<H3>
  Delete ALL URL Trees
</H3>
<P>
Delete all information bases
<PRE>
extern BOOL HTUTree_deleteAll (void);
</PRE>
<H3>
  Find a URL Tree
</H3>
<P>
Find a authentication base. Return NULL if not found
<PRE>
extern HTUTree * HTUTree_find (const char *	root,
			       const char *	host,
			       int		port);
</PRE>

<H2>
  URL Nodes
</H2>

<PRE>
extern void * HTUTree_findNode (HTUTree * tree, 
                                const char * realm, const char * path); 
</PRE>

<PRE>
extern BOOL HTUTree_addNode (HTUTree * tree, 
                             const char * realm, const char * path, 
                             void * context);
</PRE>


<PRE>
extern BOOL HTUTree_replaceNode (HTUTree * tree, 
                                 const char * realm, const char * path, 
                                 void * context);
</PRE>

<PRE>
extern BOOL HTUTree_deleteNode (HTUTree * tree, 
                                const char * realm, const char * path);
</PRE>


<PRE>
#endif /* HTUTREE_H */
</PRE>
<P>
  <HR>
<ADDRESS>
  @(#) $Id: HTUTree.html,v 2.3 1998/05/14 02:11:15 frystyk Exp $
</ADDRESS>
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