content: /*************************************************************************
   *  Compilation:  javac LookupCSV.java
   *  Execution:    java LookupCSV file.csv keyField valField
   *  Dependencies: ST.java In.java StdIn.java StdOut.java
   *  Data files:   http://algs4.cs.princeton.edu/35applications/DJIA.csv
   *                http://algs4.cs.princeton.edu/35applications/UPC.csv
   *                http://algs4.cs.princeton.edu/35applications/amino.csv
   *                http://algs4.cs.princeton.edu/35applications/elements.csv
   *                http://algs4.cs.princeton.edu/35applications/ip.csv
   *                http://algs4.cs.princeton.edu/35applications/morse.csv
   *  
   *  Reads in a set of key-value pairs from a two-column CSV file
   *  specified on the command line; then, reads in keys from standard
   *  input and prints out corresponding values.
   * 
   *  % java LookupCSV amino.csv 0 3     % java LookupCSV ip.csv 0 1 
   *  TTA                                www.google.com 
   *  Leucine                            216.239.41.99 
   *  ABC                               
   *  Not found                          % java LookupCSV ip.csv 1 0 
   *  TCT                                216.239.41.99 
   *  Serine                             www.google.com 
   *                                 
   *  % java LookupCSV amino.csv 3 0     % java LookupCSV DJIA.csv 0 1 
   *  Glycine                            29-Oct-29 
   *  GGG                                252.38 
   *                                     20-Oct-87 
   *                                     1738.74
   *
   *
   *************************************************************************/
  
  public class LookupCSV {
      public static void main(String[] args) {
          int keyField = Integer.parseInt(args[1]);
          int valField = Integer.parseInt(args[2]);
  
          // symbol table
          ST<String, String> st = new ST<String, String>();
  
          // read in the data from csv file
          In in = new In(args[0]);
          while (in.hasNextLine()) {
              String line = in.readLine();
              String[] tokens = line.split(",");
              String key = tokens[keyField];
              String val = tokens[valField];
              st.put(key, val);
          }
  
          while (!StdIn.isEmpty()) {
              String s = StdIn.readString();
              if (st.contains(s)) StdOut.println(st.get(s));
              else                StdOut.println("Not found");
          }
      }
  }
  