content: /*
   * Copyright 1999-2017 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.alibaba.druid.sql.dialect.mysql.ast.expr;
  
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLOrderingSpecification;
  import com.alibaba.druid.sql.ast.SQLReplaceable;
  import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
  
  import java.util.Collections;
  import java.util.List;
  
  public class MySqlOrderingExpr extends MySqlExprImpl implements MySqlExpr, SQLReplaceable {
      protected SQLExpr expr;
      protected SQLOrderingSpecification type;
  
      public MySqlOrderingExpr() {
      }
  
      public MySqlOrderingExpr(SQLExpr expr, SQLOrderingSpecification type) {
          super();
          setExpr(expr);
          this.type = type;
      }
  
      public MySqlOrderingExpr clone() {
          MySqlOrderingExpr x = new MySqlOrderingExpr();
          if (expr != null) {
              x.setExpr(expr.clone());
          }
          x.type = type;
          return x;
      }
  
      @Override
      public boolean replace(SQLExpr expr, SQLExpr target) {
          if (this.expr == expr) {
              setExpr(target);
              return true;
          }
  
          return false;
      }
  
      @Override
      public void accept0(MySqlASTVisitor mysqlVisitor) {
          if (mysqlVisitor.visit(this)) {
              if (expr != null) {
                  expr.accept(mysqlVisitor);
              }
          }
  
          mysqlVisitor.endVisit(this);
      }
  
      @Override
      public List getChildren() {
          return Collections.singletonList(this.expr);
      }
  
      public SQLExpr getExpr() {
          return expr;
      }
  
      public void setExpr(SQLExpr expr) {
          if (expr != null) {
              expr.setParent(this);
          }
          this.expr = expr;
      }
  
      public SQLOrderingSpecification getType() {
          return type;
      }
  
      public void setType(SQLOrderingSpecification type) {
          this.type = type;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (getClass() != obj.getClass()) {
              return false;
          }
          MySqlOrderingExpr other = (MySqlOrderingExpr) obj;
          if (expr != other.expr) {
              return false;
          }
          if (type == null) {
              if (other.type != null) {
                  return false;
              }
          } else if (!type.equals(other.type)) {
              return false;
          }
          return true;
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = 1;
          result = prime * result + ((expr == null) ? 0 : expr.hashCode());
          result = prime * result + ((type == null) ? 0 : type.hashCode());
          return result;
      }
  
  }
  