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.expr;
  
  import java.util.List;
  
  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.QualifiedName;
  import com.google.common.collect.ImmutableList;
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  
  /**
   * 支持
   *
   * @author panguanjing
   * @date 2020/11/5
   */
  @Getter
  @EqualsAndHashCode(callSuper = false)
  public class DereferenceExpression extends BaseExpression {
      private final BaseExpression base;
      private final Identifier field;
  
      public DereferenceExpression(BaseExpression base, Identifier field) {
          super(null, null);
          this.base = base;
          this.field = field;
      }
  
      public DereferenceExpression(NodeLocation location,
                                   String origin,
                                   BaseExpression base, Identifier field) {
          super(location, origin);
          this.base = base;
          this.field = field;
      }
  
      @Override
      public <R, C> R accept(IAstVisitor<R, C> visitor, C context) {
          return visitor.visitDereferenceExpression(this, context);
      }
  
      @Override
      public List<? extends Node> getChildren() {
          return ImmutableList.of(base, field);
      }
  
      public static BaseExpression from(QualifiedName name) {
          BaseExpression result = null;
  
          for (String part : name.getParts()) {
              if (result == null) {
                  result = new Identifier(part);
              } else {
                  result = new DereferenceExpression(result, new Identifier(part));
              }
          }
  
          return result;
      }
  
  }
  