duifieldmap.c

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/********************************************************************\
 * fieldmap.c -- Map one source to target, with a filter in the middle
 * 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 "config.h"

#include <glib.h>

#include "perr.h"
#include "duifield.h"
#include "duifieldmap.h"
#include "duifilter.h"

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

DuiFieldMap *
dui_field_map_new (void)
{
    DuiFieldMap *fm;
    fm = g_new0 (DuiFieldMap, 1);
    fm->source.type = DUI_FIELD_NONE;
    fm->target.type = DUI_FIELD_NONE;
    fm->filtername = NULL;
    fm->filter = NULL;
    return fm;
}

void
dui_field_map_destroy (DuiFieldMap *fm)
{
    if (!fm) return;
    dui_field_clear (&fm->source);
    dui_field_clear (&fm->target);

    g_free (fm->filtername);
    g_free (fm);
}

/* =================================================================== */
/* Transfer from source to target */

void
dui_field_map_transfer_data (DuiFieldMap *fm)
{
    DuiField *src, *tgt;
    const gchar * fieldval = NULL;

    if (!fm) return;

    src = &fm->source;
    tgt = &fm->target;

    if (NULL == tgt->set_field_value) return;
    if (src->get_field_value)
    {
        fieldval = src->get_field_value (src);
    }

    /* Note that the empty string is a valid value for "clearing"
     * fields. i.e. its used to reset fields to empty. */
    if (fm->filter) fieldval = dui_filter_apply (fm->filter, fieldval);
    if (!fieldval) fieldval = "";
    PINFO ("src=%s::\"%s\" val=\"%s\" tgt=%s::\"%s\"",
           src->type, src->fieldname, fieldval,
           tgt->type, tgt->fieldname);
    tgt->set_field_value (tgt, fieldval);
}

/* =================================================================== */
/* Transfer from source to target */

const gchar *
dui_field_map_get_value (DuiFieldMap *fm)
{
    DuiField *src;
    const gchar * fieldval = NULL;

    if (!fm) return NULL;
    src = &fm->source;

    if (src->get_field_value)
    {
        fieldval = src->get_field_value (src);
    }

    /* Note that the empty string is a valid value for "clearing"
     * fields. i.e. its used to reset fields to empty. */
    PINFO ("src=%s:\"%s\" val=\"%s\"", src->type, src->fieldname, fieldval);

    if (fm->filter) fieldval = dui_filter_apply (fm->filter, fieldval);
    return fieldval;
}

/* =================================================================== */
/* Resolve filters */

void
dui_field_map_resolve (DuiFieldMap *fm)
{
    if (!fm) return;

    if (fm->filtername)
    {
        fm->filter = dui_filter_find_by_name (fm->filtername);
    }
    else
    {
        fm->filter = NULL;
    }
}

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

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