1 /* Copyright (c) 2009, 2010 Nicira Networks
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 #define OVSDB_DATA_H 1
21 #include "ovsdb-types.h"
24 struct ovsdb_symbol_table;
26 /* One value of an atomic type (given by enum ovs_atomic_type). */
35 void ovsdb_atom_init_default(union ovsdb_atom *, enum ovsdb_atomic_type);
36 bool ovsdb_atom_is_default(const union ovsdb_atom *, enum ovsdb_atomic_type);
37 void ovsdb_atom_clone(union ovsdb_atom *, const union ovsdb_atom *,
38 enum ovsdb_atomic_type);
39 void ovsdb_atom_swap(union ovsdb_atom *, union ovsdb_atom *);
42 ovsdb_atom_needs_destruction(enum ovsdb_atomic_type type)
44 return type == OVSDB_TYPE_STRING;
48 ovsdb_atom_destroy(union ovsdb_atom *atom, enum ovsdb_atomic_type type)
50 if (type == OVSDB_TYPE_STRING) {
55 uint32_t ovsdb_atom_hash(const union ovsdb_atom *, enum ovsdb_atomic_type,
58 int ovsdb_atom_compare_3way(const union ovsdb_atom *,
59 const union ovsdb_atom *,
60 enum ovsdb_atomic_type);
62 static inline bool ovsdb_atom_equals(const union ovsdb_atom *a,
63 const union ovsdb_atom *b,
64 enum ovsdb_atomic_type type)
66 return !ovsdb_atom_compare_3way(a, b, type);
69 struct ovsdb_error *ovsdb_atom_from_json(union ovsdb_atom *,
70 const struct ovsdb_base_type *,
72 struct ovsdb_symbol_table *)
74 struct json *ovsdb_atom_to_json(const union ovsdb_atom *,
75 enum ovsdb_atomic_type);
77 char *ovsdb_atom_from_string(union ovsdb_atom *,
78 const struct ovsdb_base_type *, const char *,
79 struct ovsdb_symbol_table *)
81 void ovsdb_atom_to_string(const union ovsdb_atom *, enum ovsdb_atomic_type,
84 struct ovsdb_error *ovsdb_atom_check_constraints(
85 const union ovsdb_atom *, const struct ovsdb_base_type *)
88 /* An instance of an OVSDB type (given by struct ovsdb_type).
90 * - The 'keys' must be unique and in sorted order. Most functions that modify
91 * an ovsdb_datum maintain these invariants. Functions that don't maintain
92 * the invariants have names that end in "_unsafe". Use ovsdb_datum_sort()
93 * to check and restore these invariants.
95 * - 'n' is constrained by the ovsdb_type's 'n_min' and 'n_max'.
97 * If 'n' is nonzero, then 'keys' points to an array of 'n' atoms of the type
98 * specified by the ovsdb_type's 'key_type'. (Otherwise, 'keys' should be
101 * If 'n' is nonzero and the ovsdb_type's 'value_type' is not
102 * OVSDB_TYPE_VOID, then 'values' points to an array of 'n' atoms of the type
103 * specified by the 'value_type'. (Otherwise, 'values' should be null.)
105 * Thus, for 'n' > 0, 'keys' will always be nonnull and 'values' will be
106 * nonnull only for "map" types.
109 unsigned int n; /* Number of 'keys' and 'values'. */
110 union ovsdb_atom *keys; /* Each of the ovsdb_type's 'key_type'. */
111 union ovsdb_atom *values; /* Each of the ovsdb_type's 'value_type'. */
115 void ovsdb_datum_init_empty(struct ovsdb_datum *);
116 void ovsdb_datum_init_default(struct ovsdb_datum *, const struct ovsdb_type *);
117 bool ovsdb_datum_is_default(const struct ovsdb_datum *,
118 const struct ovsdb_type *);
119 void ovsdb_datum_clone(struct ovsdb_datum *, const struct ovsdb_datum *,
120 const struct ovsdb_type *);
121 void ovsdb_datum_destroy(struct ovsdb_datum *, const struct ovsdb_type *);
122 void ovsdb_datum_swap(struct ovsdb_datum *, struct ovsdb_datum *);
124 /* Checking and maintaining invariants. */
125 struct ovsdb_error *ovsdb_datum_sort(struct ovsdb_datum *,
126 enum ovsdb_atomic_type key_type)
129 void ovsdb_datum_sort_assert(struct ovsdb_datum *,
130 enum ovsdb_atomic_type key_type);
132 struct ovsdb_error *ovsdb_datum_check_constraints(
133 const struct ovsdb_datum *, const struct ovsdb_type *)
136 /* Type conversion. */
137 struct ovsdb_error *ovsdb_datum_from_json(struct ovsdb_datum *,
138 const struct ovsdb_type *,
140 struct ovsdb_symbol_table *)
142 struct json *ovsdb_datum_to_json(const struct ovsdb_datum *,
143 const struct ovsdb_type *);
145 char *ovsdb_datum_from_string(struct ovsdb_datum *,
146 const struct ovsdb_type *, const char *,
147 struct ovsdb_symbol_table *)
149 void ovsdb_datum_to_string(const struct ovsdb_datum *,
150 const struct ovsdb_type *, struct ds *);
153 uint32_t ovsdb_datum_hash(const struct ovsdb_datum *,
154 const struct ovsdb_type *, uint32_t basis);
155 int ovsdb_datum_compare_3way(const struct ovsdb_datum *,
156 const struct ovsdb_datum *,
157 const struct ovsdb_type *);
158 bool ovsdb_datum_equals(const struct ovsdb_datum *,
159 const struct ovsdb_datum *,
160 const struct ovsdb_type *);
163 unsigned int ovsdb_datum_find_key(const struct ovsdb_datum *,
164 const union ovsdb_atom *key,
165 enum ovsdb_atomic_type key_type);
166 unsigned int ovsdb_datum_find_key_value(const struct ovsdb_datum *,
167 const union ovsdb_atom *key,
168 enum ovsdb_atomic_type key_type,
169 const union ovsdb_atom *value,
170 enum ovsdb_atomic_type value_type);
172 /* Set operations. */
173 bool ovsdb_datum_includes_all(const struct ovsdb_datum *,
174 const struct ovsdb_datum *,
175 const struct ovsdb_type *);
176 bool ovsdb_datum_excludes_all(const struct ovsdb_datum *,
177 const struct ovsdb_datum *,
178 const struct ovsdb_type *);
179 void ovsdb_datum_union(struct ovsdb_datum *,
180 const struct ovsdb_datum *,
181 const struct ovsdb_type *,
183 void ovsdb_datum_subtract(struct ovsdb_datum *a,
184 const struct ovsdb_type *a_type,
185 const struct ovsdb_datum *b,
186 const struct ovsdb_type *b_type);
188 /* Raw operations that may not maintain the invariants. */
189 void ovsdb_datum_remove_unsafe(struct ovsdb_datum *, size_t idx,
190 const struct ovsdb_type *);
191 void ovsdb_datum_add_unsafe(struct ovsdb_datum *,
192 const union ovsdb_atom *key,
193 const union ovsdb_atom *value,
194 const struct ovsdb_type *);
198 ovsdb_datum_conforms_to_type(const struct ovsdb_datum *datum,
199 const struct ovsdb_type *type)
201 return datum->n >= type->n_min && datum->n <= type->n_max;
204 /* A table mapping from names to data items. Currently the data items are
205 * always UUIDs; perhaps this will be expanded in the future. */
207 struct ovsdb_symbol {
208 struct uuid uuid; /* The UUID that the symbol represents. */
209 bool used; /* Already used as row UUID? */
212 struct ovsdb_symbol_table *ovsdb_symbol_table_create(void);
213 void ovsdb_symbol_table_destroy(struct ovsdb_symbol_table *);
214 struct ovsdb_symbol *ovsdb_symbol_table_get(const struct ovsdb_symbol_table *,
216 struct ovsdb_symbol *ovsdb_symbol_table_put(struct ovsdb_symbol_table *,
218 const struct uuid *, bool used);
219 struct ovsdb_symbol *ovsdb_symbol_table_insert(struct ovsdb_symbol_table *,
221 const char *ovsdb_symbol_table_find_unused(const struct ovsdb_symbol_table *);
225 * Used by ovsdb_atom_from_string() and ovsdb_datum_from_string(). */
227 char *ovsdb_token_parse(const char **, char **outp) WARN_UNUSED_RESULT;
228 bool ovsdb_token_is_delim(unsigned char);
230 #endif /* ovsdb-data.h */