/******************************************************************************
 * 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
 ******************************************************************************/

package com.brianway.learning.algorithms.algs4utils;

/**
 * The <tt>LookupCSV</tt> class provides a data-driven client for reading in a
 * key-value pairs from a file; then, printing the values corresponding to the
 * keys found on standard input. Both keys and values are strings.
 * The fields to serve as the key and value are taken as command-line arguments.
 * <p>
 * For additional documentation, see <a href="http://algs4.cs.princeton.edu/35applications">Section 3.5</a> of
 * <i>Algorithms, 4th Edition</i> by Robert Sedgewick and Kevin Wayne.
 *
 * @author Robert Sedgewick
 * @author Kevin Wayne
 */
public class LookupCSV {

    // Do not instantiate.
    private 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");
            }
        }
    }
}

/******************************************************************************
 * Copyright 2002-2015, Robert Sedgewick and Kevin Wayne.
 *
 * This file is part of algs4.jar, which accompanies the textbook
 *
 * Algorithms, 4th edition by Robert Sedgewick and Kevin Wayne,
 * Addison-Wesley Professional, 2011, ISBN 0-321-57351-X.
 * http://algs4.cs.princeton.edu
 *
 *
 * algs4.jar is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * algs4.jar is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with algs4.jar.  If not, see http://www.gnu.org/licenses.
 ******************************************************************************/
