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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.sharding.route.engine.condition.engine;
19  
20  import lombok.RequiredArgsConstructor;
21  import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
22  import org.apache.shardingsphere.infra.binder.context.statement.dml.InsertStatementContext;
23  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
24  import org.apache.shardingsphere.infra.metadata.database.rule.RuleMetaData;
25  import org.apache.shardingsphere.sharding.route.engine.condition.ShardingCondition;
26  import org.apache.shardingsphere.sharding.rule.ShardingRule;
27  import org.apache.shardingsphere.timeservice.core.rule.TimestampServiceRule;
28  
29  import java.util.List;
30  
31  /**
32   * Sharding condition engine.
33   */
34  @RequiredArgsConstructor
35  public final class ShardingConditionEngine {
36      
37      private final RuleMetaData globalRuleMetaData;
38      
39      private final ShardingSphereDatabase database;
40      
41      private final ShardingRule shardingRule;
42      
43      /**
44       * Create sharding conditions.
45       *
46       * @param sqlStatementContext SQL statement context
47       * @param params SQL parameters
48       * @return sharding conditions
49       */
50      public List<ShardingCondition> createShardingConditions(final SQLStatementContext sqlStatementContext, final List<Object> params) {
51          TimestampServiceRule timestampServiceRule = globalRuleMetaData.getSingleRule(TimestampServiceRule.class);
52          return sqlStatementContext instanceof InsertStatementContext
53                  ? new InsertClauseShardingConditionEngine(database, shardingRule, timestampServiceRule).createShardingConditions((InsertStatementContext) sqlStatementContext, params)
54                  : new WhereClauseShardingConditionEngine(database, shardingRule, timestampServiceRule).createShardingConditions(sqlStatementContext, params);
55      }
56  }