ovsdb/condition.h

   1 /* Copyright (c) 2009, 2010 Nicira, Inc.
   2  *
   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:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   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.
  14  */
  15
  16 #ifndef OVSDB_CONDITION_H
  17 #define OVSDB_CONDITION_H 1
  18
  19 #include <stddef.h>
  20 #include "compiler.h"
  21 #include "ovsdb-data.h"
  22 #include "bitmap.h"
  23 #include "ovsdb-condition.h"
  24
  25 struct json;
  26 struct ovsdb_table_schema;
  27 struct ovsdb_row;
  28
  29 struct ovsdb_clause {
  30     enum ovsdb_function function;
  31     const struct ovsdb_column *column;
  32     unsigned int index;
  33     struct ovsdb_datum arg;
  34 };
  35
  36 struct ovsdb_condition {
  37     struct ovsdb_clause *clauses;
  38     size_t n_clauses;
  39     bool optimized;
  40     struct shash o_columns;
  41 };
  42
  43 #define OVSDB_CONDITION_INITIALIZER(COND) \
  44     { NULL, 0, true, SHASH_INITIALIZER(&(COND)->o_columns)}
  45
  46 void ovsdb_condition_init(struct ovsdb_condition *);
  47 bool ovsdb_condition_empty(const struct ovsdb_condition *);
  48 struct ovsdb_error *ovsdb_condition_from_json(
  49     const struct ovsdb_table_schema *,
  50     const struct json *, struct ovsdb_symbol_table *,
  51     struct ovsdb_condition *) OVS_WARN_UNUSED_RESULT;
  52 struct json *ovsdb_condition_to_json(const struct ovsdb_condition *);
  53 void ovsdb_condition_destroy(struct ovsdb_condition *);
  54 bool ovsdb_condition_match_every_clause(const struct ovsdb_row *,
  55                                         const struct ovsdb_condition *);
  56 bool ovsdb_condition_match_any_clause(const struct ovsdb_datum *,
  57                                       const struct ovsdb_condition *,
  58                                       unsigned int index_map[]);
  59 int ovsdb_condition_cmp_3way(const struct ovsdb_condition *a,
  60                              const struct ovsdb_condition *b);
  61 void ovsdb_condition_clone(struct ovsdb_condition *to,
  62                            const struct ovsdb_condition *from);
  63 bool ovsdb_condition_is_true(const struct ovsdb_condition *cond);
  64 bool ovsdb_condition_is_false(const struct ovsdb_condition *cond);
  65 const struct ovsdb_column **
  66 ovsdb_condition_get_columns(const struct ovsdb_condition *cond,
  67                             size_t *n_columns);
  68
  69 static inline bool
  70 ovsdb_condition_empty_or_match_any(const struct ovsdb_datum *row_datum,
  71                                    const struct ovsdb_condition *cnd,
  72                                    unsigned int index_map[])
  73 {
  74     return (ovsdb_condition_empty(cnd) ||
  75             ovsdb_condition_match_any_clause(row_datum, cnd, index_map));
  76 }
  77
  78 #endif /* ovsdb/condition.h */