/*
    * 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.transaction.xa.jta.connection.dialect;
  
  import lombok.SneakyThrows;
  import org.apache.shardingsphere.transaction.xa.jta.connection.XAConnectionWrapper;
  
  import javax.sql.XAConnection;
  import javax.sql.XADataSource;
  import java.lang.reflect.Constructor;
  import java.sql.Connection;
  import java.sql.SQLException;
  import java.util.Properties;
  
  /**
   * XA connection wrapper for Oracle.
   */
  public final class OracleXAConnectionWrapper implements XAConnectionWrapper {
      
      private Class<Connection> jdbcConnectionClass;
      
      private Constructor<?> xaConnectionConstructor;
      
      @Override
      public XAConnection wrap(final XADataSource xaDataSource, final Connection connection) throws SQLException {
          return createXAConnection(connection.unwrap(jdbcConnectionClass));
      }
      
      @Override
      public void init(final Properties props) {
          loadReflection();
      }
      
      private void loadReflection() {
          jdbcConnectionClass = getJDBCConnectionClass();
          xaConnectionConstructor = getXAConnectionConstructor();
      }
      
      @SuppressWarnings("unchecked")
      @SneakyThrows(ReflectiveOperationException.class)
      private Class<Connection> getJDBCConnectionClass() {
          return (Class<Connection>) Class.forName("oracle.jdbc.internal.OracleConnection");
      }
      
      @SneakyThrows(ReflectiveOperationException.class)
      private Constructor<?> getXAConnectionConstructor() {
          return Class.forName("oracle.jdbc.xa.client.OracleXAConnection").getConstructor(Connection.class);
      }
      
      @SneakyThrows(ReflectiveOperationException.class)
      private XAConnection createXAConnection(final Connection connection) {
          return (XAConnection) xaConnectionConstructor.newInstance(connection);
      }
      
      @Override
      public String getDatabaseType() {
          return "Oracle";
      }
  }