content: /*
   * Copyright 2021-2022 Alibaba Group Holding Ltd.
   *
   *    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.
   */
  
  package com.aliyun.fastmodel.core.tree.relation;
  
  import java.util.List;
  
  import com.aliyun.fastmodel.core.tree.BaseRelation;
  import com.aliyun.fastmodel.core.tree.IAstVisitor;
  import com.aliyun.fastmodel.core.tree.Node;
  import com.aliyun.fastmodel.core.tree.NodeLocation;
  import com.aliyun.fastmodel.core.tree.expr.Identifier;
  import com.google.common.collect.ImmutableList;
  import lombok.Builder;
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.ToString;
  
  /**
   * 别名的关系
   *
   * @author panguanjing
   * @date 2020/11/3
   */
  @Getter
  @Builder
  @EqualsAndHashCode(callSuper = false)
  @ToString
  public class AliasedRelation extends BaseRelation {
  
      private final BaseRelation relation;
  
      private final Identifier alias;
  
      private final List<Identifier> columnNames;
  
      public AliasedRelation(BaseRelation relation, Identifier alias) {
          this(null, relation, alias, null);
      }
  
      public AliasedRelation(BaseRelation relation, Identifier alias,
                             List<Identifier> columnNames) {
          this(null, relation, alias, columnNames);
      }
  
      public AliasedRelation(NodeLocation location,
                             BaseRelation relation, Identifier alias,
                             List<Identifier> columnNames) {
          super(location);
          this.relation = relation;
          this.alias = alias;
          this.columnNames = columnNames;
      }
  
      @Override
      public List<? extends Node> getChildren() {
          return ImmutableList.of(relation);
      }
  
      @Override
      public <R, C> R accept(IAstVisitor<R, C> visitor, C context) {
          return visitor.visitAliasedRelation(this, context);
      }
  }
  