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.parser.visitor;
  
  import java.util.List;
  
  import com.aliyun.fastmodel.core.tree.AliasedName;
  import com.aliyun.fastmodel.core.tree.Comment;
  import com.aliyun.fastmodel.core.tree.Node;
  import com.aliyun.fastmodel.core.tree.Property;
  import com.aliyun.fastmodel.core.tree.QualifiedName;
  import com.aliyun.fastmodel.core.tree.expr.Identifier;
  import com.aliyun.fastmodel.core.tree.statement.businessunit.CreateBusinessUnit;
  import com.aliyun.fastmodel.core.tree.statement.businessunit.SetBusinessUnitAlias;
  import com.aliyun.fastmodel.core.tree.statement.businessunit.SetBusinessUnitComment;
  import com.aliyun.fastmodel.core.tree.statement.element.CreateElement;
  import com.aliyun.fastmodel.parser.AstBuilder;
  import com.aliyun.fastmodel.parser.annotation.SubVisitor;
  import com.aliyun.fastmodel.parser.generate.FastModelGrammarParser.CreateBuStatementContext;
  import com.aliyun.fastmodel.parser.generate.FastModelGrammarParser.SetBuAliasContext;
  import com.aliyun.fastmodel.parser.generate.FastModelGrammarParser.SetBuCommentContext;
  import com.google.common.collect.ImmutableList;
  
  /**
   * Desc:
   *
   * @author panguanjing
   * @date 2021/4/8
   */
  @SubVisitor
  public class BusinessUnitVisitor extends AstBuilder {
      @Override
      public Node visitCreateBuStatement(CreateBuStatementContext ctx) {
          QualifiedName qu = getQualifiedName(ctx.qualifiedName());
          Comment comment = visitIfPresent(ctx.comment(), Comment.class).orElse(null);
          List<Property> list = getProperties(ctx.setProperties());
          AliasedName aliasedName = visitIfPresent(ctx.alias(), AliasedName.class).orElse(null);
          return new CreateBusinessUnit(CreateElement.builder()
              .notExists(ctx.ifNotExists() != null)
              .properties(list)
              .comment(comment)
              .qualifiedName(qu)
              .aliasedName(aliasedName)
              .createOrReplace(ctx.replace() != null)
              .build());
      }
  
      @Override
      public Node visitSetBuComment(SetBuCommentContext ctx) {
          Comment comment = (Comment)visit(ctx.alterStatementSuffixSetComment());
          Identifier visit = (Identifier)visit(ctx.identifier());
          return new SetBusinessUnitComment(QualifiedName.of(ImmutableList.of(visit)),
              comment);
      }
  
      @Override
      public Node visitSetBuAlias(SetBuAliasContext ctx) {
          Identifier visit = (Identifier)visit(ctx.identifier());
          return new SetBusinessUnitAlias(
              QualifiedName.of(ImmutableList.of(visit)),
              (AliasedName)visit(ctx.setAliasedName())
          );
      }
  }
  