content: /**
   * 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.apex.malhar.sql.sample;
  
  import org.apache.apex.malhar.sql.SQLExecEnvironment;
  import org.apache.apex.malhar.sql.table.CSVMessageFormat;
  import org.apache.apex.malhar.sql.table.FileEndpoint;
  import org.apache.apex.malhar.sql.table.KafkaEndpoint;
  import org.apache.hadoop.conf.Configuration;
  
  import com.datatorrent.api.DAG;
  import com.datatorrent.api.StreamingApplication;
  import com.datatorrent.api.annotation.ApplicationAnnotation;
  
  @ApplicationAnnotation(name = "PureStyleSQLApplication")
  /**
   * @since 3.6.0
   */
  public class PureStyleSQLApplication implements StreamingApplication
  {
    @Override
    public void populateDAG(DAG dag, Configuration conf)
    {
      // Source definition
      String schemaInName = conf.get("schemaInName");
      String schemaInDef = conf.get("schemaInDef");
      String broker = conf.get("broker");
      String sourceTopic = conf.get("topic");
  
      // Destination definition
      String schemaOutName = conf.get("schemaOutName");
      String schemaOutDef = conf.get("schemaOutDef");
      String outputFolder = conf.get("outputFolder");
      String outFilename = conf.get("destFileName");
  
      // SQL statement
      String sql = conf.get("sql");
  
      SQLExecEnvironment.getEnvironment()
          .registerTable(schemaInName, new KafkaEndpoint(broker, sourceTopic,
              new CSVMessageFormat(schemaInDef)))
          .registerTable(schemaOutName, new FileEndpoint(outputFolder, outFilename,
              new CSVMessageFormat(schemaOutDef)))
          .registerFunction("APEXCONCAT", this.getClass(), "apex_concat_str")
          .executeSQL(dag, sql);
    }
  
    public static String apex_concat_str(String s1, String s2)
    {
      return s1 + s2;
    }
  }
  