duiresolver.c

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/********************************************************************\
 * duiresolver.c -- Resolve names into actual pointers              *
 * Copyright (C) 2003 Linas Vepstas <linas@linas.org>               *
 * http://dwi.sourceforge.net                                       *
 *                                                                  *
 * This library is free software; you can redistribute it and/or    *
 * modify it under the terms of the GNU Lesser General Public       *
 * License as published by the Free Software Foundation; either     *
 * version 2.1 of the License, or (at your option) any later version.
 *                                                                  *
 * This library 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 Lesser General Public License for more details.              *
 *                                                                  *
 * You should have received a copy of the GNU Lesser General Public *
 * License along with this program; if not, contact:                *
 *                                                                  *
 * Free Software Foundation           Voice:  +1-617-542-5942       *
 * 59 Temple Place - Suite 330        Fax:    +1-617-542-2652       *
 * Boston, MA  02111-1307,  USA       gnu@gnu.org                   *
\********************************************************************/

#include <glib.h>
#include "duifield.h"
#include "duiresolver.h"

struct DuiResolverResolver_s {
    DuiResolverFieldFunc resolver_func;
    gpointer user_data;
};

typedef struct DuiResolverResolver_s DuiResolverResolver;

struct DuiResolverRealizer_s {
    DuiResolverRealizeFunc realize_func;
    gpointer user_data;
};

typedef struct DuiResolverRealizer_s DuiResolverRealizer;

/* =================================================================== */

DuiResolver *
dui_resolver_new (void)
{
    DuiResolver *res;
    res = g_new0 (DuiResolver,1);
    res->field_list = NULL;
    res->resolver_list = NULL;
    res->realizer_list = NULL;
    return res;
}

void
dui_resolver_destroy (DuiResolver *res)
{
    if (!res) return;
    g_list_free (res->field_list);
}

void
dui_resolver_add_field (DuiResolver *res , DuiField *fld)
{
    if (!res) return;
    res->field_list = g_list_prepend (res->field_list, fld);
}

void
dui_resolver_add_resolver (DuiResolver *res,
                           DuiResolverFieldFunc fn, gpointer ud)
{
    DuiResolverResolver *rr;

    if (!res) return;
    rr = g_new0 (DuiResolverResolver, 1);
    rr->resolver_func = fn;
    rr->user_data = ud;

    res->resolver_list = g_list_prepend (res->resolver_list, rr);
}

void
dui_resolver_remove_resolver (DuiResolver *res,
                           DuiResolverFieldFunc fn, gpointer ud)
{
    GList *n;
    if (!res) return;

    for (n=res->resolver_list; n; n=n->next)
    {
        DuiResolverResolver *rr = n->data;
        if ((rr->user_data == ud) && (rr->resolver_func == fn))
        {
            g_free (rr);
            res->resolver_list = g_list_delete_link (res->resolver_list, n);
            return;
        }
    }
}

void
dui_resolver_resolve (DuiResolver *res)
{
    GList *n, *f;

    if (!res) return;

    for (n=res->resolver_list; n; n=n->next)
    {
        DuiResolverResolver *rr = n->data;

        for (f= res->field_list; f; f=f->next)
        {
            DuiField *fld = f->data;
            (rr->resolver_func) (fld, rr->user_data);
        }
    }
}

/* ================================================================== */

void
dui_resolver_add_realizer (DuiResolver *res,
                           DuiResolverRealizeFunc fn, gpointer ud)
{
    DuiResolverRealizer *rr;

    if (!res) return;
    rr = g_new0 (DuiResolverRealizer, 1);
    rr->realize_func = fn;
    rr->user_data = ud;

    res->realizer_list = g_list_prepend (res->realizer_list, rr);
}

void
dui_resolver_realize (DuiResolver *res)
{
    GList *n;

    if (!res) return;

    for (n=res->realizer_list; n; n=n->next)
    {
        DuiResolverRealizer *rr = n->data;
        (rr->realize_func) (rr->user_data);
    }
}

/* ======================= END OF FILE =============================== */

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