ovsdb/condition.h

   1 /* Copyright (c) 2009 Nicira Networks
   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
  23 struct json;
  24 struct ovsdb_table_schema;
  25 struct ovsdb_row;
  26
  27 /* These list is ordered in ascending order of the fraction of tables row that
  28  * they are (heuristically) expected to leave in query results. */
  29 #define OVSDB_FUNCTIONS                         \
  30     OVSDB_FUNCTION(OVSDB_F_EQ, "==")                  \
  31     OVSDB_FUNCTION(OVSDB_F_INCLUDES, "includes")      \
  32     OVSDB_FUNCTION(OVSDB_F_LE, "<=")                  \
  33     OVSDB_FUNCTION(OVSDB_F_LT, "<")                   \
  34     OVSDB_FUNCTION(OVSDB_F_GE, ">=")                  \
  35     OVSDB_FUNCTION(OVSDB_F_GT, ">")                   \
  36     OVSDB_FUNCTION(OVSDB_F_EXCLUDES, "excludes")      \
  37     OVSDB_FUNCTION(OVSDB_F_NE, "!=")
  38
  39 enum ovsdb_function {
  40 #define OVSDB_FUNCTION(ENUM, NAME) ENUM,
  41     OVSDB_FUNCTIONS
  42 #undef OVSDB_FUNCTION
  43 };
  44
  45 struct ovsdb_error *ovsdb_function_from_string(const char *,
  46                                                enum ovsdb_function *)
  47     WARN_UNUSED_RESULT;
  48 const char *ovsdb_function_to_string(enum ovsdb_function);
  49
  50 struct ovsdb_clause {
  51     enum ovsdb_function function;
  52     const struct ovsdb_column *column;
  53     struct ovsdb_datum arg;
  54 };
  55
  56 struct ovsdb_condition {
  57     struct ovsdb_clause *clauses;
  58     size_t n_clauses;
  59 };
  60
  61 #define OVSDB_CONDITION_INITIALIZER { NULL, 0 }
  62
  63 struct ovsdb_error *ovsdb_condition_from_json(
  64     const struct ovsdb_table_schema *,
  65     const struct json *, const struct ovsdb_symbol_table *,
  66     struct ovsdb_condition *) WARN_UNUSED_RESULT;
  67 struct json *ovsdb_condition_to_json(const struct ovsdb_condition *);
  68 void ovsdb_condition_destroy(struct ovsdb_condition *);
  69 bool ovsdb_condition_evaluate(const struct ovsdb_row *,
  70                               const struct ovsdb_condition *);
  71
  72 #endif /* ovsdb/condition.h */