/*
* Copyright 1999-2015 dangdang.com.
* <p>
* 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.
* </p>
*/
package com.dangdang.ddframe.rdb.sharding.router.mixed;
import java.util.ArrayList;
import java.util.Collection;
import com.dangdang.ddframe.rdb.sharding.api.rule.ShardingRule;
import com.dangdang.ddframe.rdb.sharding.parser.result.router.ConditionContext;
import com.dangdang.ddframe.rdb.sharding.parser.result.router.SQLStatementType;
import com.dangdang.ddframe.rdb.sharding.router.RoutingResult;
import com.dangdang.ddframe.rdb.sharding.router.binding.BindingTablesRouter;
import com.dangdang.ddframe.rdb.sharding.router.single.SingleRoutingResult;
import com.dangdang.ddframe.rdb.sharding.router.single.SingleTableRouter;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
/**
* 混合多库表路由类.
*
* @author gaohongtao
* @author zhangliang
*/
@RequiredArgsConstructor
@Slf4j
public class MixedTablesRouter {
private final ShardingRule shardingRule;
private final Collection<String> logicTables;
private final ConditionContext conditionContext;
private final SQLStatementType sqlStatementType;
/**
* 路由.
*
* @return 路由结果
*/
// TODO 支持多bindingTable rule
public RoutingResult route() {
Collection<String> bindingTables = shardingRule.filterAllBindingTables(logicTables);
Collection<String> remainingTables = new ArrayList<>(logicTables);
Collection<SingleRoutingResult> result = new ArrayList<>(logicTables.size());
if (1 < bindingTables.size()) {
result.add(new BindingTablesRouter(shardingRule, bindingTables, conditionContext, sqlStatementType).route());
remainingTables.removeAll(bindingTables);
}
for (String each : remainingTables) {
SingleRoutingResult routingResult = new SingleTableRouter(shardingRule, each, conditionContext, sqlStatementType).route();
if (null != routingResult) {
result.add(routingResult);
}
}
log.trace("mixed tables sharding result: {}", result);
if (result.isEmpty()) {
return null;
}
if (1 == result.size()) {
return result.iterator().next();
}
return new CartesianTablesRouter(result).route();
}
}