/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  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 io.seata.rm.datasource.undo;

import com.alibaba.druid.util.JdbcConstants;
import io.seata.common.exception.NotSupportYetException;
import io.seata.common.exception.ShouldNeverHappenException;


/**
 * The type Undo executor factory.
 *
 * @author sharajava
 */
public class UndoExecutorFactory {

    /**
     * Gets undo executor.
     *
     * @param dbType     the db type
     * @param sqlUndoLog the sql undo log
     * @return the undo executor
     */
    public static AbstractUndoExecutor getUndoExecutor(String dbType, SQLUndoLog sqlUndoLog) {
      if (!dbType.equals(JdbcConstants.MYSQL) && !dbType.equals(JdbcConstants.ORACLE)) {
        throw new NotSupportYetException(dbType);
      }
      AbstractUndoExecutor result = null;
      UndoExecutorHolder holder = UndoExecutorHolderFactory.getUndoExecutorHolder(dbType.toLowerCase());
      switch ((sqlUndoLog.getSqlType())) {
        case INSERT:
          result = holder.getInsertExecutor(sqlUndoLog);
          break;
        case UPDATE:
          result = holder.getUpdateExecutor(sqlUndoLog);
          break;
        case DELETE:
          result = holder.getDeleteExecutor(sqlUndoLog);
          break;
        default:
          throw new ShouldNeverHappenException();
      }
      return result;
    }
}

@@ -1182,30 +1182,16 @@
    if (!
-dbType.equals(
 JdbcCons
@@ -1205,28 +1205,28 @@
 YSQL
-) && !dbType.equals(
+.equals(dbType) && !
 Jdbc
@@ -1241,16 +1241,30 @@
 s.ORACLE
+.equals(dbType
 )) %7B%0A   

fix NPE in UndoExecutorFactory (#1902)