package edu.neu.ccs.demeter;

/** A terminal class for parsing a full line.  Put Line in a class
    dictionary to represent a full line in an input sentence, terminated
    by line.separator (which is not included in the Line object). */
final public class Line implements java.io.Serializable {
  private String str;
  /** Construct an empty line. */
  public Line() { str = ""; }
  /** Construct a Line from a String.  Note that a Line created
      outside of the parser is not constrained to be a single line. */
  public Line(String s) { str = s; }
  /** Construct a Line from an Object by converting it to a String
      with {@link Object#toString()}.  Note that a Line created outside of
      the parser is not constrained to be a single line. */
  public Line(Object obj) { str = obj.toString(); }
  public String toString() { return str; }
  public int hashCode() { return str.hashCode(); }
  public boolean equals(Object line) {
    return (line instanceof Line) && str.equals(((Line) line).str);
  }
  /** The line separator of the current JVM.  It is initialized from
      the <code>line.separator</code> system property.
      @see System#getProperty(String, String)
  */
  public static final String nl;
  static {
    String newline = "\n";
    try {
      newline = System.getProperty("line.separator", newline);
    } catch (SecurityException e) {
      System.err.println(e);
    }
    nl = newline;
  }
}