ChainOfResponsibilityDemo.java

import java.util.List;
import java.util.ArrayList;
 
public class ChainOfResponsibilityDemo {
 
  /**
   * @param args
   */
  public static void main(String[] args) {
     
    //List of file names to parse. 
    List<String> fileList = populateFiles();
     
    //No successor for this handler because this is the last in chain. 
    Parser xmlParser = new XmlParser();
 
    //XmlParser is the successor of CsvParser.
    Parser csvParser = new CsvParser(xmlParser);
     
    //CsvParser is the successor of JsonParser.
    Parser jsonParser = new JsonParser(csvParser);
     
    //JsonParser is the successor of TextParser.
    //TextParser is the start of the chain. 
    Parser textParser = new TextParser(jsonParser);
     
    //Pass the file name to the first handler in the chain.
    for ( String fileName : fileList){
      textParser.parse(fileName);
    }
 
  }
   
  private static List<String> populateFiles(){
     
    List<String> fileList = new ArrayList<>();
    fileList.add("someFile.txt");
    fileList.add("otherFile.json");
    fileList.add("xmlFile.xml");
    fileList.add("csvFile.csv");
    fileList.add("csvFile.doc");
     
    return fileList;
  }
 
}