/*
    * 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.infra.binder.statement;
  
  import com.cedarsoftware.util.CaseInsensitiveMap;
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.infra.binder.segment.from.TableSegmentBinderContext;
  import org.apache.shardingsphere.infra.database.core.type.DatabaseType;
  import org.apache.shardingsphere.infra.metadata.ShardingSphereMetaData;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.ProjectionSegment;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.LinkedList;
  import java.util.Map;
  
  /**
   * SQL statement binder context.
   */
  @RequiredArgsConstructor
  @Getter
  public final class SQLStatementBinderContext {
      
      private final ShardingSphereMetaData metaData;
      
      private final String defaultDatabaseName;
      
      private final DatabaseType databaseType;
      
      private final Collection<String> variableNames;
      
      private final Collection<String> usingColumnNames = new HashSet<>();
      
      private final Collection<ProjectionSegment> joinTableProjectionSegments = new LinkedList<>();
      
      private final Map<String, TableSegmentBinderContext> externalTableBinderContexts = new CaseInsensitiveMap<>();
      
      private final Collection<String> pivotColumnNames = new HashSet<>();
  }