1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.shardingsphere.distsql.handler.engine.update.rdl.rule.spi.database;
19
20 import org.apache.shardingsphere.infra.config.rule.RuleConfiguration;
21 import org.apache.shardingsphere.infra.rule.ShardingSphereRule;
22 import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
23
24 /**
25 * Database rule drop executor.
26 *
27 * @param <T> type of SQL statement
28 * @param <R> type of rule
29 * @param <C> type of rule configuration
30 */
31 public interface DatabaseRuleDropExecutor<T extends SQLStatement, R extends ShardingSphereRule, C extends RuleConfiguration> extends DatabaseRuleDefinitionExecutor<T, R> {
32
33 /**
34 * TODO Remove temporary default implementation
35 * Build to be dropped rule configuration.
36 *
37 * @param sqlStatement SQL statement
38 * @return to be dropped rule configuration
39 */
40 default C buildToBeDroppedRuleConfiguration(final T sqlStatement) {
41 return null;
42 }
43
44 /**
45 * Build to be altered rule configuration.
46 *
47 * @param sqlStatement SQL statement
48 * @return to be altered rule configuration
49 */
50 default C buildToBeAlteredRuleConfiguration(final T sqlStatement) {
51 return null;
52 }
53
54 /**
55 * Whether there is dropped data.
56 *
57 * @param sqlStatement SQL statement
58 * @return dropped data exists or does not exist
59 */
60 default boolean hasAnyOneToBeDropped(final T sqlStatement) {
61 return true;
62 }
63 }