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/* Copyright (c) 2009, 2010 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "query.h"
#include "column.h"
#include "condition.h"
#include "row.h"
#include "table.h"
void
ovsdb_query(struct ovsdb_table *table, const struct ovsdb_condition *cnd,
bool (*output_row)(const struct ovsdb_row *, void *aux), void *aux)
{
if (cnd->n_clauses > 0
&& cnd->clauses[0].column->index == OVSDB_COL_UUID
&& cnd->clauses[0].function == OVSDB_F_EQ) {
/* Optimize the case where the query has a clause of the form "uuid ==
* <some-uuid>", since we have an index on UUID. */
const struct ovsdb_row *row;
row = ovsdb_table_get_row(table, &cnd->clauses[0].arg.keys[0].uuid);
if (row && row->table == table && ovsdb_condition_evaluate(row, cnd)) {
output_row(row, aux);
}
} else {
/* Linear scan. */
const struct ovsdb_row *row, *next;
HMAP_FOR_EACH_SAFE (row, next, hmap_node, &table->rows) {
if (ovsdb_condition_evaluate(row, cnd) && !output_row(row, aux)) {
break;
}
}
}
}
static bool
query_row_set_cb(const struct ovsdb_row *row, void *results_)
{
struct ovsdb_row_set *results = results_;
ovsdb_row_set_add_row(results, row);
return true;
}
void
ovsdb_query_row_set(struct ovsdb_table *table,
const struct ovsdb_condition *condition,
struct ovsdb_row_set *results)
{
ovsdb_query(table, condition, query_row_set_cb, results);
}
static bool
query_distinct_cb(const struct ovsdb_row *row, void *hash_)
{
struct ovsdb_row_hash *hash = hash_;
ovsdb_row_hash_insert(hash, row);
return true;
}
void
ovsdb_query_distinct(struct ovsdb_table *table,
const struct ovsdb_condition *condition,
const struct ovsdb_column_set *columns,
struct ovsdb_row_set *results)
{
if (!columns || ovsdb_column_set_contains(columns, OVSDB_COL_UUID)) {
/* All the result rows are guaranteed to be distinct anyway. */
return ovsdb_query_row_set(table, condition, results);
} else {
/* Use hash table to drop duplicates. */
struct ovsdb_row_hash_node *node;
struct ovsdb_row_hash hash;
ovsdb_row_hash_init(&hash, columns);
ovsdb_query(table, condition, query_distinct_cb, &hash);
HMAP_FOR_EACH (node, hmap_node, &hash.rows) {
ovsdb_row_set_add_row(results, node->row);
}
ovsdb_row_hash_destroy(&hash, false);
}
}
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