/**
 *  file :  FileWordList.java
 *  desc :  Implements a class for reading a list of Words
 *          from a file.
 */


import java.io.*;


public class FileWordList {
  /**
   *  post :  opens `file' for reading words one at a time
   */
  public FileWordList( String fname ) throws FileNotFoundException {
    filename = fname;
    reset();
  }

  /**
   *  post :  re-opens the file for reading from the beginning
   */
  public void reset() throws FileNotFoundException {
    FileInputStream f = new FileInputStream( filename );
    InputStreamReader i = new InputStreamReader( f );
    Reader r = new BufferedReader( i );

    fileStream = new StreamTokenizer( r );
  }

  /**
   *  post :  returns true <==> no more input waiting
   */
  public boolean isEOF() {
    return (fileStream.ttype == StreamTokenizer.TT_EOF);
  }


  /**
   *  post :  returns the next word from the file, or
   *          null if no more words are available
   */
  public Word nextWord() throws IOException {
    if( isEOF() )
      return null;

    fileStream.nextToken();
    if( isEOF() )
      return null;

    return new Word(fileStream.sval);
  }

  private String          filename;
  private StreamTokenizer fileStream;
}

// eof