package algs35;
import stdlib.*;
/* ***********************************************************************
 *  Compilation:  javac WhiteFilter.java
 *  Execution:    java WhiteFilter whitelist.txt < input.txt
 *  Dependencies: SET In.java StdIn.java StdOut.java
 *  Data files:   http://algs4.cs.princeton.edu/35applications/tinyTale.txt
 *                http://algs4.cs.princeton.edu/35applications/list.txt
 *
 *  Read in a whitelist of words from a file. Then read in a list of
 *  words from standard input and print out all those words that
 *  are in the first file.
 *
 *  % more tinyTale.txt
 *  it was the best of times it was the worst of times
 *  it was the age of wisdom it was the age of foolishness
 *  it was the epoch of belief it was the epoch of incredulity
 *  it was the season of light it was the season of darkness
 *  it was the spring of hope it was the winter of despair
 *
 *  % more list.txt
 *  was it the of
 *
 *  % java WhiteFilter list.txt < tinyTale.txt
 *  it was the of it was the of
 *  it was the of it was the of
 *  it was the of it was the of
 *  it was the of it was the of
 *  it was the of it was the of
 *
 *************************************************************************/

public class WhiteFilter {
  public static void main(String[] args) {
    args = new String[] { "data/list.txt" };
    StdIn.fromFile ("data/tinyTale.txt");

    SET<String> set = new SET<>();

    // read in strings and add to set
    In in = new In(args[0]);
    while (!in.isEmpty()) {
      String word = in.readString();
      set.add(word);
    }

    // read in string from standard input, printing out all exceptions
    while (!StdIn.isEmpty()) {
      String word = StdIn.readString();
      if (set.contains(word))
        StdOut.println(word);
    }
  }
}