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.statement;
  
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  public class SQLNotNullConstraint extends SQLConstraintImpl implements SQLColumnConstraint {
      public SQLNotNullConstraint() {
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          visitor.visit(this);
          visitor.endVisit(this);
      }
  
      public SQLNotNullConstraint clone() {
          SQLNotNullConstraint x = new SQLNotNullConstraint();
          super.cloneTo(x);
          return x;
      }
  }
  