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.SQLName;
  import com.alibaba.druid.sql.ast.SQLObjectImpl;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SQLAlterTableAddColumn extends SQLObjectImpl implements SQLAlterTableItem {
      private final List<SQLColumnDefinition> columns = new ArrayList<SQLColumnDefinition>();
  
      // for mysql
      private SQLName firstColumn;
      private SQLName afterColumn;
      private boolean first;
      private Boolean restrict;
      private boolean cascade;
      private boolean ifNotExists;
  
      public SQLAlterTableAddColumn() {
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, columns);
          }
          visitor.endVisit(this);
      }
  
      public boolean isIfNotExists() {
          return ifNotExists;
      }
  
      public void setIfNotExists(boolean ifNotExists) {
          this.ifNotExists = ifNotExists;
      }
  
      public List<SQLColumnDefinition> getColumns() {
          return columns;
      }
  
      public void addColumn(SQLColumnDefinition column) {
          if (column != null) {
              column.setParent(this);
          }
          this.columns.add(column);
      }
  
      public SQLName getFirstColumn() {
          return firstColumn;
      }
  
      public void setFirstColumn(SQLName first) {
          this.firstColumn = first;
      }
  
      public boolean isFirst() {
          return first;
      }
  
      public void setFirst(boolean first) {
          this.first = first;
      }
  
      public SQLName getAfterColumn() {
          return afterColumn;
      }
  
      public void setAfterColumn(SQLName after) {
          this.afterColumn = after;
      }
  
      public Boolean getRestrict() {
          return restrict;
      }
  
      public boolean isRestrict() {
          if (restrict == null) {
              return !cascade;
          }
          return restrict;
      }
  
      public void setRestrict(boolean restrict) {
          this.restrict = restrict;
      }
  
      public boolean isCascade() {
          return cascade;
      }
  
      public void setCascade(boolean cascade) {
          this.cascade = cascade;
      }
  }
  