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.ast.expr;
  
  import com.alibaba.druid.sql.ast.*;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Created by wenshao on 14/06/2017.
   */
  public class SQLFlashbackExpr extends SQLExprImpl implements SQLReplaceable {
      private Type type;
      private SQLExpr expr;
  
      public SQLFlashbackExpr() {
      }
  
      public SQLFlashbackExpr(Type type, SQLExpr expr) {
          this.type = type;
          this.setExpr(expr);
      }
  
      public Type getType() {
          return type;
      }
  
      public void setType(Type type) {
          this.type = type;
      }
  
      public SQLExpr getExpr() {
          return expr;
      }
  
      public void setExpr(SQLExpr expr) {
          if (expr != null) {
              expr.setParent(this);
          }
          this.expr = expr;
      }
  
      @Override
      public boolean replace(SQLExpr expr, SQLExpr target) {
          if (this.expr == expr) {
              setExpr((SQLName) target);
              return true;
          }
          return false;
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              if (this.expr != null) {
                  this.expr.accept(visitor);
              }
          }
          visitor.endVisit(this);
      }
  
      @Override
      public List<SQLObject> getChildren() {
          return Collections.<SQLObject>singletonList(expr);
      }
  
      public SQLFlashbackExpr clone() {
          SQLFlashbackExpr x = new SQLFlashbackExpr();
          x.type = this.type;
          if (expr != null) {
              x.setExpr(expr.clone());
          }
          return x;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
  
          SQLFlashbackExpr that = (SQLFlashbackExpr) o;
  
          if (type != that.type) {
              return false;
          }
          return expr != null ? expr.equals(that.expr) : that.expr == null;
      }
  
      @Override
      public int hashCode() {
          int result = type != null ? type.hashCode() : 0;
          result = 31 * result + (expr != null ? expr.hashCode() : 0);
          return result;
      }
  
      public static enum Type {
          SCN, TIMESTAMP
      }
  }
  