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/* GdaXql: the xml query object
* Copyright (C) 2000-2002 The GNOME Foundation.
*
* AUTHORS:
* Gerhard Dieringer <gdieringer@compuserve.com>
* Cleber Rodrigues <cleber@gnome-db.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gda-xql-stack.h"
#include "gda-xql-utils.h"
static void
destroy_object_list(GSList *list);
struct _GdaXqlStackPrivate {
GSList *list;
};
static void gda_xql_stack_init (GdaXqlStack *xqlstack);
static void gda_xql_stack_class_init (GdaXqlStackClass *klass);
static GObjectClass *parent_class = NULL;
GType
gda_xql_stack_get_type (void)
{
static GType type = 0;
if (type == 0) {
static const GTypeInfo info = {
sizeof (GdaXqlStackClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gda_xql_stack_class_init,
(GClassFinalizeFunc) NULL,
NULL /* class_data */,
sizeof (GdaXqlStack),
0 /* n_preallocs */,
(GInstanceInitFunc) gda_xql_stack_init,
};
type = g_type_register_static (G_TYPE_OBJECT, "GdaXqlStack", &info, 0);
}
return type;
}
static void
gda_xql_stack_finalize(GObject *object)
{
GdaXqlStack *xqlstack;
xqlstack = GDA_XQL_STACK (object);
if(G_OBJECT_CLASS(parent_class)->finalize) \
(* G_OBJECT_CLASS(parent_class)->finalize)(object);
if(xqlstack->priv->list) {
destroy_object_list (xqlstack->priv->list);
xqlstack->priv->list = NULL;
}
g_free (xqlstack->priv);
}
static void
gda_xql_stack_init (GdaXqlStack *xqlstack)
{
xqlstack->priv = g_new0 (GdaXqlStackPrivate, 1);
xqlstack->priv->list = NULL;
}
static void
gda_xql_stack_class_init (GdaXqlStackClass *klass)
{
GObjectClass *g_object_class;
g_object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
g_object_class->finalize = gda_xql_stack_finalize;
}
GdaXqlStack *
gda_xql_stack_new (void)
{
return g_object_new (GDA_TYPE_XQL_STACK, NULL);
}
void
gda_xql_stack_push (GdaXqlStack *xqlstack, GdaXqlItem *item)
{
g_return_if_fail (xqlstack != NULL);
g_return_if_fail (GDA_IS_XQL_STACK (xqlstack));
g_return_if_fail (item != NULL);
g_return_if_fail (GDA_IS_XQL_ITEM (item));
g_object_ref (G_OBJECT (item));
xqlstack->priv->list = g_slist_prepend (xqlstack->priv->list, item);
}
GdaXqlItem *
gda_xql_stack_pop (GdaXqlStack * xqlstack)
{
GSList *list;
GdaXqlItem *item;
g_return_val_if_fail (xqlstack != NULL, NULL);
g_return_val_if_fail (GDA_IS_XQL_STACK (xqlstack), NULL);
list = xqlstack->priv->list;
g_return_val_if_fail (list != NULL, NULL);
item = list->data;
g_object_unref (G_OBJECT(item));
xqlstack->priv->list = list->next;
g_slist_free_1(list);
return item;
}
gboolean
gda_xql_stack_empty (GdaXqlStack * xqlstack)
{
g_return_val_if_fail (xqlstack != NULL, FALSE);
g_return_val_if_fail (GDA_IS_XQL_STACK (xqlstack), FALSE);
return (xqlstack->priv->list == NULL) ? TRUE : FALSE;
}
static void
destroy_object_list(GSList *list)
{
g_slist_foreach(list, (GFunc) g_object_unref, NULL);
g_slist_free (list);
}
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