1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 2010, 2011, 2012 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 #include "data/session.h"
24 #include "data/dataset.h"
25 #include "libpspp/assertion.h"
26 #include "libpspp/cast.h"
27 #include "libpspp/hash-functions.h"
28 #include "libpspp/i18n.h"
29 #include "libpspp/str.h"
30 #include "libpspp/hmapx.h"
32 #include "gl/xalloc.h"
36 struct hmapx datasets;
37 struct dataset *active;
38 char *syntax_encoding; /* Default encoding for syntax files. */
39 unsigned int n_dataset_names; /* For session_generate_dataset_name(). */
42 static struct hmapx_node *session_lookup_dataset__ (const struct session *,
50 s = xmalloc (sizeof *s);
51 hmapx_init (&s->datasets);
53 s->syntax_encoding = xstrdup ("Auto");
54 s->n_dataset_names = 0;
59 session_destroy (struct session *s)
63 struct hmapx_node *node, *next;
67 HMAPX_FOR_EACH_SAFE (ds, node, next, &s->datasets)
69 free (s->syntax_encoding);
75 session_active_dataset (struct session *s)
81 session_set_active_dataset (struct session *s, struct dataset *ds)
83 assert (ds == NULL || dataset_session (ds) == s);
88 session_add_dataset (struct session *s, struct dataset *ds)
92 old = session_lookup_dataset (s, dataset_name (ds));
96 session_remove_dataset (s, old);
98 hmapx_insert (&s->datasets, ds,
99 utf8_hash_case_string (dataset_name (ds), 0));
100 if (s->active == NULL)
103 dataset_set_session__ (ds, s);
107 session_remove_dataset (struct session *s, struct dataset *ds)
109 assert (ds != s->active);
110 hmapx_delete (&s->datasets, session_lookup_dataset__ (s, dataset_name (ds)));
111 dataset_set_session__ (ds, NULL);
115 session_lookup_dataset (const struct session *s, const char *name)
117 struct hmapx_node *node = session_lookup_dataset__ (s, name);
118 return node != NULL ? node->data : NULL;
122 session_lookup_dataset_assert (const struct session *s, const char *name)
124 struct dataset *ds = session_lookup_dataset (s, name);
130 session_set_default_syntax_encoding (struct session *s, const char *encoding)
132 free (s->syntax_encoding);
133 s->syntax_encoding = xstrdup (encoding);
137 session_get_default_syntax_encoding (const struct session *s)
139 return s->syntax_encoding;
143 session_n_datasets (const struct session *s)
145 return hmapx_count (&s->datasets);
149 session_for_each_dataset (const struct session *s,
150 void (*cb) (struct dataset *, void *aux),
153 struct hmapx_node *node, *next;
156 HMAPX_FOR_EACH_SAFE (ds, node, next, &s->datasets)
161 session_get_dataset_by_seqno (const struct session *s, unsigned int seqno)
163 struct hmapx_node *node;
166 HMAPX_FOR_EACH (ds, node, &s->datasets)
167 if (dataset_seqno (ds) == seqno)
172 /* Returns an identifier that is is not currently in use as a dataset name.
173 The caller must free the returned identifier, with free(). */
175 session_generate_dataset_name (struct session *s)
181 s->n_dataset_names++;
182 assert(s->n_dataset_names != 0);
184 name = xasprintf ("DataSet%u", s->n_dataset_names);
185 if (!session_lookup_dataset (s, name))
191 static struct hmapx_node *
192 session_lookup_dataset__ (const struct session *s_, const char *name)
194 struct session *s = CONST_CAST (struct session *, s_);
195 struct hmapx_node *node;
198 HMAPX_FOR_EACH_WITH_HASH (ds, node, utf8_hash_case_string (name, 0),
200 if (!utf8_strcasecmp (dataset_name (ds), name))