/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.alter;
  
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import lombok.Setter;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.AlterDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.ColumnDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.position.ColumnPositionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.ColumnSegment;
  
  import java.util.Optional;
  
  /**
   * Change column definition segment.
   */
  @RequiredArgsConstructor
  @Getter
  @Setter
  public final class ChangeColumnDefinitionSegment implements AlterDefinitionSegment {
      
      private final int startIndex;
      
      private final int stopIndex;
      
      private final ColumnDefinitionSegment columnDefinition;
      
      private ColumnSegment previousColumn;
      
      private ColumnPositionSegment columnPosition;
      
      /**
       * Get column position.
       *
       * @return column position
       */
      public Optional<ColumnPositionSegment> getColumnPosition() {
          return Optional.ofNullable(columnPosition);
      }
  }