/*
    * 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.constraint;
  
  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.CreateDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.index.IndexSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.ColumnSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.SimpleTableSegment;
  
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.Optional;
  
  /**
   * Constraint definition segment.
   */
  @RequiredArgsConstructor
  @Getter
  @Setter
  public final class ConstraintDefinitionSegment implements CreateDefinitionSegment, AlterDefinitionSegment {
      
      private final int startIndex;
      
      private final int stopIndex;
      
      private final Collection<ColumnSegment> primaryKeyColumns = new LinkedList<>();
      
      private final Collection<ColumnSegment> indexColumns = new LinkedList<>();
      
      private ConstraintSegment constraintName;
      
      private IndexSegment indexName;
      
      private SimpleTableSegment referencedTable;
      
      private boolean uniqueKey;
      
      private boolean primaryKey;
      
      /**
       * Get constraint name.
       *
       * @return constraint name.
       */
      public Optional<ConstraintSegment> getConstraintName() {
          return Optional.ofNullable(constraintName);
      }
      
      /**
       * Get index name.
       *
       * @return index name
       */
      public Optional<IndexSegment> getIndexName() {
          return Optional.ofNullable(indexName);
      }
      
      /**
       * Get referenced table.
       *
       * @return referenced table
       */
      public Optional<SimpleTableSegment> getReferencedTable() {
          return Optional.ofNullable(referencedTable);
      }
  }