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.formatter.ExpressionFormatter;
  import com.aliyun.fastmodel.core.tree.AbstractNode;
  import com.aliyun.fastmodel.core.tree.IAstVisitor;
  import com.aliyun.fastmodel.core.tree.Node;
  import com.aliyun.fastmodel.core.tree.NodeLocation;
  import com.google.common.collect.ImmutableList;
  import lombok.Getter;
  import lombok.Setter;
  import org.apache.commons.lang3.StringUtils;
  
  /**
   * 表达式对象:
   *
   * @author panguanjing
   * @date 2020/9/23
   */
  @Getter
  @Setter
  public abstract class BaseExpression extends AbstractNode {
  
      /**
       * 原始的文本表达式
       */
      private String origin;
  
      /**
       * 是否被括号包围
       */
      private boolean parenthesized;
  
      public BaseExpression(NodeLocation location) {
          super(location);
      }
  
      public BaseExpression(NodeLocation location, String origin) {
          super(location);
          this.origin = origin;
      }
  
      @Override
      public List<? extends Node> getChildren() {
          return ImmutableList.of();
      }
  
      @Override
      public <R, C> R accept(IAstVisitor<R, C> visitor, C context) {
          return visitor.visitExpression(this, context);
      }
  
      /**
       * 优先从origin里获取，如果没有，那么读取toString内容
       *
       * @return
       */
      public String getOrigin() {
          if (StringUtils.isNotBlank(origin)) {
              return origin;
          }
          return toString();
      }
  
      @Override
      public String toString() {
          return ExpressionFormatter.formatExpression(this);
      }
  }
  