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.examples.csvformatter;
  
  import org.apache.apex.malhar.contrib.formatter.CsvFormatter;
  import org.apache.apex.malhar.contrib.parser.JsonParser;
  import org.apache.apex.malhar.lib.appdata.schemas.SchemaUtils;
  import org.apache.hadoop.conf.Configuration;
  
  import com.datatorrent.api.Context.PortContext;
  import com.datatorrent.api.DAG;
  import com.datatorrent.api.StreamingApplication;
  import com.datatorrent.api.annotation.ApplicationAnnotation;
  
  @ApplicationAnnotation(name = "CustomOutputFormatter")
  /**
   * @since 3.7.0
   */
  public class Application implements StreamingApplication
  {
    //Set the delimiters and schema structure  for the custom output in schema.json
    private static final String filename = "schema.json";
  
    @Override
    public void populateDAG(DAG dag, Configuration conf)
    {
      JsonGenerator generator = dag.addOperator("JsonGenerator", JsonGenerator.class);
      JsonParser jsonParser = dag.addOperator("jsonParser", JsonParser.class);
  
      CsvFormatter formatter = dag.addOperator("formatter", CsvFormatter.class);
      formatter.setSchema(SchemaUtils.jarResourceFileToString(filename));
      dag.setInputPortAttribute(formatter.in, PortContext.TUPLE_CLASS, PojoEvent.class);
  
      HDFSOutputOperator<String> hdfsOutput = dag.addOperator("HDFSOutputOperator", HDFSOutputOperator.class);
      hdfsOutput.setLineDelimiter("");
  
      dag.addStream("parserStream", generator.out, jsonParser.in);
      dag.addStream("formatterStream", jsonParser.out, formatter.in);
      dag.addStream("outputStream", formatter.out, hdfsOutput.input);
  
    }
  }
  