1 /* Copyright (c) 2009, 2010 Nicira, Inc.
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.
21 #include "condition.h"
26 ovsdb_query(struct ovsdb_table *table, const struct ovsdb_condition *cnd,
27 bool (*output_row)(const struct ovsdb_row *, void *aux), void *aux)
29 if (cnd->n_clauses > 0
30 && cnd->clauses[0].column->index == OVSDB_COL_UUID
31 && cnd->clauses[0].function == OVSDB_F_EQ) {
32 /* Optimize the case where the query has a clause of the form "uuid ==
33 * <some-uuid>", since we have an index on UUID. */
34 const struct ovsdb_row *row;
36 row = ovsdb_table_get_row(table, &cnd->clauses[0].arg.keys[0].uuid);
37 if (row && row->table == table && ovsdb_condition_evaluate(row, cnd)) {
42 const struct ovsdb_row *row, *next;
44 HMAP_FOR_EACH_SAFE (row, next, hmap_node, &table->rows) {
45 if (ovsdb_condition_evaluate(row, cnd) && !output_row(row, aux)) {
53 query_row_set_cb(const struct ovsdb_row *row, void *results_)
55 struct ovsdb_row_set *results = results_;
56 ovsdb_row_set_add_row(results, row);
61 ovsdb_query_row_set(struct ovsdb_table *table,
62 const struct ovsdb_condition *condition,
63 struct ovsdb_row_set *results)
65 ovsdb_query(table, condition, query_row_set_cb, results);
69 query_distinct_cb(const struct ovsdb_row *row, void *hash_)
71 struct ovsdb_row_hash *hash = hash_;
72 ovsdb_row_hash_insert(hash, row);
77 ovsdb_query_distinct(struct ovsdb_table *table,
78 const struct ovsdb_condition *condition,
79 const struct ovsdb_column_set *columns,
80 struct ovsdb_row_set *results)
82 if (!columns || ovsdb_column_set_contains(columns, OVSDB_COL_UUID)) {
83 /* All the result rows are guaranteed to be distinct anyway. */
84 return ovsdb_query_row_set(table, condition, results);
86 /* Use hash table to drop duplicates. */
87 struct ovsdb_row_hash_node *node;
88 struct ovsdb_row_hash hash;
90 ovsdb_row_hash_init(&hash, columns);
91 ovsdb_query(table, condition, query_distinct_cb, &hash);
92 HMAP_FOR_EACH (node, hmap_node, &hash.rows) {
93 ovsdb_row_set_add_row(results, node->row);
95 ovsdb_row_hash_destroy(&hash, false);