simplify XATransactionEvent

            case LOCAL:

                return new LocalTransactionEvent(operationType, cachedConnections.values(), autoCommit);

            case XA:

                return new XATransactionEvent(operationType, "");

                return new XATransactionEvent(operationType);

            case BASE:

            default:

                throw new UnsupportedOperationException(TransactionTypeHolder.get().name());

import com.google.common.base.Optional;

import io.shardingsphere.core.constant.transaction.TransactionOperationType;

import lombok.Getter;

import lombok.RequiredArgsConstructor;

import lombok.Setter;

import java.sql.SQLException;

 * @author zhaojun

 */

@RequiredArgsConstructor

@Getter

@Setter

public abstract class TransactionEngine {

    private final String sql;

        Optional<TransactionOperationType> operationType = parseSQL();

        if (operationType.isPresent() && isInTransaction(operationType.get())) {

            TransactionTypeHolder.set(TransactionType.XA);

            EventBusInstance.getInstance().post(new XATransactionEvent(operationType.get(), getSql()));

            EventBusInstance.getInstance().post(new XATransactionEvent(operationType.get()));

            return true;

        }

        return false;

public final class XATransactionEvent implements ShardingTransactionEvent {

    private final TransactionOperationType operationType;

    private final String sql;

}