From: Heikki Levanto <heikki@indexdata.dk>
Date: Tue, 9 Apr 2002 15:24:13 +0000 (+0000)
Subject: rsbetween.[ch] - new result set type
X-Git-Tag: CHANGELOG
X-Git-Url: http://git.indexdata.com/?p=idzebra-moved-to-github.git;a=commitdiff_plain;h=71e41c3f5146a6f783fbae7e59776bcdd4e3c4c8

rsbetween.[ch] - new result set type
---

diff --git a/include/Makefile.am b/include/Makefile.am
index 52baf65..2e9ccdd 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -2,4 +2,5 @@
 noinst_HEADERS = bfile.h bset.h charmap.h dfa.h dict.h direntz.h isam.h \
  isamc.h isamd.h isams.h mfile.h passwddb.h recctrl.h res.h rsbool.h rset.h \
  rsisam.h rsisamc.h rsisams.h rsisamd.h rsm_or.h rsnull.h rstemp.h set.h \
- sortidx.h str.h zebra-lock.h zebramap.h zebrautl.h zebraver.h isamb.h
+ sortidx.h str.h zebra-lock.h zebramap.h zebrautl.h zebraver.h isamb.h \
+ rsbetween.h
diff --git a/include/rsbetween.h b/include/rsbetween.h
new file mode 100644
index 0000000..39a5e50
--- /dev/null
+++ b/include/rsbetween.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 1994-2002, Index Data
+ * All rights reserved.
+ * Sebastian Hammer, Adam Dickmeiss, Heikki Levanto
+ *
+ * $Id: rsbetween.h,v 1.1 2002-04-09 15:24:13 heikki Exp $
+ *
+ * Result set that returns anything in between two things,
+ * typically start-tag, stuff, end-tag.
+ *
+ */
+
+#ifndef RSET_BETWEEN_H
+#define RSET_BETWEEN_H
+
+#include <rset.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const struct rset_control *rset_kind_between;
+
+typedef struct rset_between_parms
+{
+    int     key_size;
+    RSET    rset_l; 
+    RSET    rset_m;
+    RSET    rset_r;
+    int (*cmp)(const void *p1, const void *p2);
+} rset_between_parms;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/rset/Makefile.am b/rset/Makefile.am
index e7fb2a5..f35adce 100644
--- a/rset/Makefile.am
+++ b/rset/Makefile.am
@@ -1,7 +1,7 @@
-## $Id: Makefile.am,v 1.2 2001-01-16 16:56:15 heikki Exp $
+## $Id: Makefile.am,v 1.3 2002-04-09 15:24:13 heikki Exp $
 noinst_LIBRARIES = librset.a
 
-librset_a_SOURCES = rset.c rstemp.c rsisam.c rsnull.c rsbool.c \
+librset_a_SOURCES = rset.c rstemp.c rsisam.c rsnull.c rsbool.c rsbetween.c \
 	rsisamc.c rsm_or.c rsisams.c rsisamd.c
 
 INCLUDES = -I$(srcdir)/../include @YAZINC@
diff --git a/rset/rsbetween.c b/rset/rsbetween.c
new file mode 100644
index 0000000..17b26b5
--- /dev/null
+++ b/rset/rsbetween.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright (C) 1994-2002, Index Data
+ * All rights reserved.
+ * Sebastian Hammer, Adam Dickmeiss, Heikki Levanto
+ *
+ * $Id: rsbetween.c,v 1.1 2002-04-09 15:24:13 heikki Exp $
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <rsbetween.h>
+#include <zebrautl.h>
+
+static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
+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, int *term_index);
+static int r_write (RSFD rfd, const void *buf);
+
+static const struct rset_control control_between = 
+{
+    "between",
+    r_create,
+    r_open,
+    r_close,
+    r_delete,
+    r_rewind,
+    r_count,
+    r_read,
+    r_write,
+};
+
+
+const struct rset_control *rset_kind_between = &control_between;
+
+struct rset_between_info {
+    int key_size;
+    RSET rset_l;
+    RSET rset_m;
+    RSET rset_r;
+    int term_index_s;
+    int (*cmp)(const void *p1, const void *p2);
+    struct rset_between_rfd *rfd_list;
+};
+
+struct rset_between_rfd {
+    RSFD rfd_l;
+    RSFD rfd_m;
+    RSFD rfd_r;
+    int  more_l;
+    int  more_m;
+    int  more_r;
+    int term_index_l;
+    int term_index_m;
+    int term_index_r;
+    void *buf_l;
+    void *buf_m;
+    void *buf_r;
+    int level;
+    struct rset_between_rfd *next;
+    struct rset_between_info *info;
+};    
+
+static void *r_create (RSET ct, const struct rset_control *sel, void *parms)
+{
+    rset_between_parms *between_parms = (rset_between_parms *) parms;
+    struct rset_between_info *info;
+
+    info = (struct rset_between_info *) xmalloc (sizeof(*info));
+    info->key_size = between_parms->key_size;
+    info->rset_l = between_parms->rset_l;
+    info->rset_m = between_parms->rset_m;
+    info->rset_r = between_parms->rset_r;
+    if (rset_is_volatile(info->rset_l) || 
+        rset_is_volatile(info->rset_m) ||
+        rset_is_volatile(info->rset_r))
+        ct->flags |= RSET_FLAG_VOLATILE;
+    info->cmp = between_parms->cmp;
+    info->rfd_list = NULL;
+    
+    info->term_index_s = info->rset_l->no_rset_terms;
+    ct->no_rset_terms =
+	info->rset_l->no_rset_terms + 
+	info->rset_m->no_rset_terms + 
+        info->rset_r->no_rset_terms;
+    ct->rset_terms = (RSET_TERM *)
+	xmalloc (sizeof (*ct->rset_terms) * ct->no_rset_terms);
+
+    memcpy (ct->rset_terms, info->rset_l->rset_terms,
+	    info->rset_l->no_rset_terms * sizeof(*ct->rset_terms));
+    memcpy (ct->rset_terms + info->rset_l->no_rset_terms,
+	    info->rset_m->rset_terms,
+	    info->rset_m->no_rset_terms * sizeof(*ct->rset_terms));
+    memcpy (ct->rset_terms + info->rset_l->no_rset_terms + 
+                             info->rset_m->no_rset_terms,
+	    info->rset_r->rset_terms,
+	    info->rset_r->no_rset_terms * sizeof(*ct->rset_terms));
+    return info;
+}
+
+static RSFD r_open (RSET ct, int flag)
+{
+    struct rset_between_info *info = (struct rset_between_info *) ct->buf;
+    struct rset_between_rfd *rfd;
+
+    if (flag & RSETF_WRITE)
+    {
+	logf (LOG_FATAL, "between set type is read-only");
+	return NULL;
+    }
+    rfd = (struct rset_between_rfd *) xmalloc (sizeof(*rfd));
+    rfd->next = info->rfd_list;
+    info->rfd_list = rfd;
+    rfd->info = info;
+
+    rfd->buf_l = xmalloc (info->key_size);
+    rfd->buf_m = xmalloc (info->key_size);
+    rfd->buf_r = xmalloc (info->key_size);
+    rfd->rfd_l = rset_open (info->rset_l, RSETF_READ);
+    rfd->rfd_m = rset_open (info->rset_m, RSETF_READ);
+    rfd->rfd_r = rset_open (info->rset_r, RSETF_READ);
+    rfd->more_l = rset_read (info->rset_l, rfd->rfd_l, rfd->buf_l,
+			     &rfd->term_index_l);
+    rfd->more_m = rset_read (info->rset_m, rfd->rfd_m, rfd->buf_m,
+			     &rfd->term_index_m);
+    rfd->more_r = rset_read (info->rset_r, rfd->rfd_r, rfd->buf_r,
+			     &rfd->term_index_r);
+    rfd->level=0;
+    return rfd;
+}
+
+static void r_close (RSFD rfd)
+{
+    struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
+    struct rset_between_rfd **rfdp;
+    
+    for (rfdp = &info->rfd_list; *rfdp; rfdp = &(*rfdp)->next)
+        if (*rfdp == rfd)
+        {
+            xfree ((*rfdp)->buf_l);
+            xfree ((*rfdp)->buf_m);
+            xfree ((*rfdp)->buf_r);
+            rset_close (info->rset_l, (*rfdp)->rfd_l);
+            rset_close (info->rset_m, (*rfdp)->rfd_m);
+            rset_close (info->rset_r, (*rfdp)->rfd_r);
+            *rfdp = (*rfdp)->next;
+            xfree (rfd);
+            return;
+        }
+    logf (LOG_FATAL, "r_close but no rfd match!");
+    assert (0);
+}
+
+static void r_delete (RSET ct)
+{
+    struct rset_between_info *info = (struct rset_between_info *) ct->buf;
+
+    assert (info->rfd_list == NULL);
+    xfree (ct->rset_terms);
+    rset_delete (info->rset_l);
+    rset_delete (info->rset_m);
+    rset_delete (info->rset_r);
+    xfree (info);
+}
+
+static void r_rewind (RSFD rfd)
+{
+    struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
+    struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
+
+    logf (LOG_DEBUG, "rsbetween_rewind");
+    rset_rewind (info->rset_l, p->rfd_l);
+    rset_rewind (info->rset_m, p->rfd_m);
+    rset_rewind (info->rset_r, p->rfd_r);
+    p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l, &p->term_index_l);
+    p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m, &p->term_index_m);
+    p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r, &p->term_index_r);
+    p->level=0;
+}
+
+static int r_count (RSET ct)
+{
+    return 0;
+}
+
+static int r_read (RSFD rfd, void *buf, int *term_index)
+{
+    struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
+    struct rset_between_info *info = p->info;
+    int cmp_l;
+    int cmp_r;
+
+
+    while (p->more_m)
+    {
+
+	/* forward L until past m, count levels, note rec boundaries */
+	if (p->more_l)
+	    cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
+	else
+	    cmp_l=2; /* past this record */
+        while (cmp_l < 0)   /* l before m */
+	{
+            if (cmp_l == -2)
+		p->level=0; /* earlier record */
+            if (cmp_l == -1)
+		p->level++; /* relevant start tag */
+            if (p->more_l)
+            {
+                p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l,
+		    		   &p->term_index_l);
+	        cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
+            }
+            else
+		cmp_l=2; 
+        } /* forward L */
+	
+	/* forward R until past m, count levels */
+        if (p->more_r)
+	    cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
+	else
+	    cmp_r=2; 
+        while (cmp_r < 0)   /* r before m */
+	{
+ 	    /* -2, earlier record, doesn't matter */
+            if (cmp_r == -1)
+		p->level--; /* relevant end tag */
+            if (p->more_r)
+            {
+                p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r,
+		    		   &p->term_index_r);
+	        cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
+            }
+            else
+		cmp_r=2; 
+        } /* forward R */
+	
+	if ( ( p->level <= 0 ) && ! p->more_l)
+	    return 0; /* no more start tags, nothing more to find */
+
+	if ( p->level > 0)  /* within a tag pair (or deeper) */
+	{
+	    memcpy (buf, p->buf_m, info->key_size);
+            *term_index = p->term_index_m;
+	    return 1;  
+	}
+	else
+	    if ( ! p->more_l )  /* not in data, no more starts */
+		return 0;  /* ergo, nothing can be found. stop scanning */
+        
+        p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
+                               &p->term_index_m);
+    } /* while more_m */
+      
+    return 0;  /* no more data possible */
+
+}  /* r_read */
+
+
+static int r_write (RSFD rfd, const void *buf)
+{
+    logf (LOG_FATAL, "between set type is read-only");
+    return -1;
+}
+