-/*
- * Copyright (C) 1994-1995, Index Data I/S
- * All rights reserved.
- * Sebastian Hammer, Adam Dickmeiss
- *
- * $Log: rsnull.c,v $
- * Revision 1.8 1996-10-29 13:55:24 adam
- * Include of zebrautl.h instead of alexutil.h.
- *
- * Revision 1.7 1995/12/11 09:15:25 adam
- * New set types: sand/sor/snot - ranked versions of and/or/not in
- * ranked/semi-ranked result sets.
- * Note: the snot not finished yet.
- * New rset member: flag.
- * Bug fix: r_delete in rsrel.c did free bad memory block.
- *
- * Revision 1.6 1995/10/12 12:41:57 adam
- * Private info (buf) moved from struct rset_control to struct rset.
- * Bug fixes in relevance.
- *
- * Revision 1.5 1995/10/10 14:00:04 adam
- * Function rset_open changed its wflag parameter to general flags.
- *
- * Revision 1.4 1995/10/06 14:38:06 adam
- * New result set method: r_score.
- * Local no (sysno) and score is transferred to retrieveCtrl.
- *
- * Revision 1.3 1995/09/08 14:52:42 adam
- * Work on relevance feedback.
- *
- * Revision 1.2 1995/09/07 13:58:43 adam
- * New parameter: result-set file descriptor (RSFD) to support multiple
- * positions within the same result-set.
- * Boolean operators: and, or, not implemented.
- *
- * Revision 1.1 1995/09/06 10:35:44 adam
- * Null set implemented.
- *
- */
+/* $Id: rsnull.c,v 1.31 2005-01-15 19:38:35 adam Exp $
+ Copyright (C) 1995-2005
+ Index Data ApS
+
+This file is part of the Zebra server.
+
+Zebra is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+Zebra 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 General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Zebra; see the file LICENSE.zebra. If not, write to the
+Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.
+*/
+
+
#include <stdio.h>
-#include <rsnull.h>
+#include <assert.h>
#include <zebrautl.h>
+#include <rset.h>
+
-static void *r_create(const struct rset_control *sel, void *parms,
- int *flags);
static RSFD r_open (RSET ct, int flag);
static void r_close (RSFD rfd);
static void r_delete (RSET ct);
-static void r_rewind (RSFD rfd);
-static int r_count (RSET ct);
-static int r_read (RSFD rfd, void *buf);
+static void r_pos (RSFD rfd, double *current, double *total);
+static int r_read (RSFD rfd, void *buf, TERMID *term);
static int r_write (RSFD rfd, const void *buf);
-static int r_score (RSFD rfd, int *score);
-static const rset_control control =
+static const struct rset_control control =
{
"null",
- r_create,
+ r_delete,
+ rset_get_no_terms,
r_open,
r_close,
- r_delete,
- r_rewind,
- r_count,
+ rset_default_forward,
+ r_pos,
r_read,
r_write,
- r_score
};
-const rset_control *rset_kind_null = &control;
+const struct rset_control *rset_kind_null = &control;
-static void *r_create(const struct rset_control *sel, void *parms,
- int *flags)
+RSET rsnull_create(NMEM nmem, const struct key_control *kcontrol )
{
- return NULL;
+ RSET rnew=rset_create_base(&control, nmem, kcontrol,0,0);
+ rnew->priv=NULL;
+ return rnew;
}
static RSFD r_open (RSET ct, int flag)
{
+ RSFD rfd;
if (flag & RSETF_WRITE)
{
- logf (LOG_FATAL, "NULL set type is read-only");
- return NULL;
+ yaz_log (YLOG_FATAL, "NULL set type is read-only");
+ return NULL;
}
- return "";
+ rfd=rfd_create_base(ct);
+ rfd->priv=NULL;
+ return rfd;
}
static void r_close (RSFD rfd)
{
+ rfd_delete_base(rfd);
}
static void r_delete (RSET ct)
{
}
-static void r_rewind (RSFD rfd)
-{
- logf (LOG_DEBUG, "rsnull_rewind");
-}
-static int r_count (RSET ct)
+static void r_pos (RSFD rfd, double *current, double *total)
{
- return 0;
+ assert(rfd);
+ assert(current);
+ assert(total);
+ *total=0;
+ *current=0;
}
-static int r_read (RSFD rfd, void *buf)
+static int r_read (RSFD rfd, void *buf, TERMID *term)
{
+ if (term)
+ *term=0; /* NULL */
return 0;
}
static int r_write (RSFD rfd, const void *buf)
{
- logf (LOG_FATAL, "NULL set type is read-only");
- return -1;
-}
-
-static int r_score (RSFD rfd, int *score)
-{
- *score = -1;
+ yaz_log (YLOG_FATAL, "NULL set type is read-only");
return -1;
}