/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.
   */
  
  package org.apache.shardingsphere.broadcast.route;
  
  import org.apache.shardingsphere.broadcast.constant.BroadcastOrder;
  import org.apache.shardingsphere.broadcast.route.engine.BroadcastRouteEngineFactory;
  import org.apache.shardingsphere.broadcast.rule.BroadcastRule;
  import org.apache.shardingsphere.infra.annotation.HighFrequencyInvocation;
  import org.apache.shardingsphere.infra.config.props.ConfigurationProperties;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
  import org.apache.shardingsphere.infra.metadata.database.rule.RuleMetaData;
  import org.apache.shardingsphere.infra.route.context.RouteContext;
  import org.apache.shardingsphere.infra.route.lifecycle.EntranceSQLRouter;
  import org.apache.shardingsphere.infra.session.query.QueryContext;
  
  import java.util.Collection;
  
  /**
   * Broadcast SQL router.
   */
  @HighFrequencyInvocation
  public final class BroadcastSQLRouter implements EntranceSQLRouter<BroadcastRule> {
      
      @Override
      public RouteContext createRouteContext(final QueryContext queryContext, final RuleMetaData globalRuleMetaData, final ShardingSphereDatabase database,
                                             final BroadcastRule rule, final Collection<String> tableNames, final ConfigurationProperties props) {
          Collection<String> broadcastTableNames = rule.getBroadcastTableNames(tableNames);
          if (broadcastTableNames.isEmpty()) {
              return new RouteContext();
          }
          return BroadcastRouteEngineFactory.newInstance(queryContext, broadcastTableNames).route(rule);
      }
      
      @Override
      public Type getType() {
          return Type.DATA_NODE;
      }
      
      @Override
      public int getOrder() {
          return BroadcastOrder.ORDER;
      }
      
      @Override
      public Class<BroadcastRule> getTypeClass() {
          return BroadcastRule.class;
      }
  }