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.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLName;
  import com.alibaba.druid.sql.ast.SQLReplaceable;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  public class SQLColumnCheck extends SQLConstraintImpl implements SQLColumnConstraint, SQLReplaceable {
      private SQLExpr expr;
      protected Boolean enforced;
  
      public SQLColumnCheck() {
      }
  
      public SQLColumnCheck(SQLExpr expr) {
          this.setExpr(expr);
      }
  
      public SQLExpr getExpr() {
          return expr;
      }
  
      public void setExpr(SQLExpr expr) {
          if (expr != null) {
              expr.setParent(this);
          }
          this.expr = expr;
      }
  
      public Boolean getEnforced() {
          return enforced;
      }
  
      public void setEnforced(Boolean enforced) {
          this.enforced = enforced;
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, this.getName());
              acceptChild(visitor, this.getExpr());
          }
          visitor.endVisit(this);
      }
  
      public SQLColumnCheck clone() {
          SQLColumnCheck x = new SQLColumnCheck();
  
          super.cloneTo(x);
  
          if (expr != null) {
              x.setExpr(expr.clone());
          }
  
          return x;
      }
  
      @Override
      public boolean replace(SQLExpr expr, SQLExpr target) {
          if (this.expr == expr) {
              setExpr(target);
              return true;
          }
  
          if (getName() == expr) {
              setName((SQLName) target);
              return true;
          }
  
          if (getComment() == expr) {
              setComment(target);
              return true;
          }
          return false;
      }
  }
  