// ** This class was generated with DemFGen (vers:02/05/2009)

package gen;

import edu.neu.ccs.demeterf.demfgen.lib.*;
import edu.neu.ccs.demeterf.*;




/** Representation of Literal */
public class Literal extends LiteralOrBoolean{
    public final Sign value;
    public final Variable var;

    /** Construct a(n) Literal Instance */
    public Literal(Sign value, Variable var){
        this.value = value;
        this.var = var;
    }
    /** Is the given Literal Equal to this one? */
    public boolean equals(Object o){
        if(!(o instanceof Literal))return false;
        Literal oo = (Literal)o;
        return (((Object)value).equals(oo.value))&&(((Object)var).equals(oo.var));
    }
    /** Parse an instance of Literal from the given String */
    public static Literal parse(String inpt) throws ParseException{
        return new TheParser(new java.io.StringReader(inpt)).parse_Literal();
    }
    /** Parse an instance of Literal from the given Stream */
    public static Literal parse(java.io.InputStream inpt) throws ParseException{
        return new TheParser(inpt).parse_Literal();
    }
    /** Parse an instance of Literal from the given Reader */
    public static Literal parse(java.io.Reader inpt) throws ParseException{
        return new TheParser(inpt).parse_Literal();
    }

    /** Field Class for Literal.value */
    public static class value extends edu.neu.ccs.demeterf.control.Fields.any{}
    /** Field Class for Literal.var */
    public static class var extends edu.neu.ccs.demeterf.control.Fields.any{}

boolean isPositive2() {
  return value.isPositive(); }

boolean isPositive() {
  return new Traversal(new ID() {
      // assume one Pos in first field of Literal
      boolean combine(Pos pos) {return true;}
      boolean combine(Neg neg) {return false;}
      boolean combine(Literal o, boolean s) { return s; }
      // boolean combine(Object o, boolean s) { return s; }
  }, Control.bypass("gen.Literal.var")).<Boolean> traverse(this);
  // nicer: Control.strategy("Literal -> Pos")
}

    /** DGP method from Class Display */
    public String display(){ return gen.Display.DisplayM(this); }
    /** DGP method from Class Print */
    public String print(){ return gen.Print.PrintM(this); }
    /** DGP method from Class ToStr */
    public String toStr(){ return gen.ToStr.ToStrM(this); }

}