/*
    * 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.statement.ddl;
  
  import lombok.Getter;
  import lombok.Setter;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.alter.AddColumnDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.alter.ChangeColumnDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.alter.DropColumnDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.alter.ModifyColumnDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.alter.RenameColumnSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.constraint.alter.AddConstraintDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.constraint.alter.DropConstraintDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.constraint.alter.ModifyConstraintDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.constraint.alter.ValidateConstraintDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.index.DropIndexDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.index.RenameIndexDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.table.ConvertTableDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.SimpleTableSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.AbstractSQLStatement;
  
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.Optional;
  
  /**
   * Alter table statement.
   */
  @Getter
  @Setter
  public abstract class AlterTableStatement extends AbstractSQLStatement implements DDLStatement {
      
      private SimpleTableSegment table;
      
      private SimpleTableSegment renameTable;
      
      private ConvertTableDefinitionSegment convertTableDefinition;
      
      private final Collection<AddColumnDefinitionSegment> addColumnDefinitions = new LinkedList<>();
      
      private final Collection<ModifyColumnDefinitionSegment> modifyColumnDefinitions = new LinkedList<>();
      
      private final Collection<ChangeColumnDefinitionSegment> changeColumnDefinitions = new LinkedList<>();
      
      private final Collection<DropColumnDefinitionSegment> dropColumnDefinitions = new LinkedList<>();
      
      private final Collection<AddConstraintDefinitionSegment> addConstraintDefinitions = new LinkedList<>();
      
      private final Collection<ValidateConstraintDefinitionSegment> validateConstraintDefinitions = new LinkedList<>();
      
      private final Collection<ModifyConstraintDefinitionSegment> modifyConstraintDefinitions = new LinkedList<>();
      
      private final Collection<DropConstraintDefinitionSegment> dropConstraintDefinitions = new LinkedList<>();
      
      private final Collection<DropIndexDefinitionSegment> dropIndexDefinitions = new LinkedList<>();
      
      private final Collection<RenameColumnSegment> renameColumnDefinitions = new LinkedList<>();
      
      private final Collection<RenameIndexDefinitionSegment> renameIndexDefinitions = new LinkedList<>();
      
      /**
       * Get rename table.
       *
       * @return rename table
       */
      public Optional<SimpleTableSegment> getRenameTable() {
          return Optional.ofNullable(renameTable);
      }
      
      /**
       * Get convert table definition.
       *
       * @return convert table definition
       */
      public Optional<ConvertTableDefinitionSegment> getConvertTableDefinition() {
          return Optional.ofNullable(convertTableDefinition);
      }
  }