Operator.java

package arithmeticExpression.tokens;

import java.util.regex.Pattern;

/**
 *
 * @author Feder1co 5oave
 */
public class Operator extends Token {
    //TODO verificare la correttezza dell'uso dei get* static

    public enum Operators {
        ADDITION ("+", 0),
        SUBSTRACTION ("-", 0),
        MULTIPLICATION ("*", 1),
        DIVISION ("/", 1);
        Operators (String s, int prio) {
            this.s = s;
            this.prio = prio;
        }
        private int prio;
        private String s;
    }

    private Operators type;
    
    public  Operator (int pos, Operators type) {   //XXX private contructor
        super(pos);
        this.type = type;
    }
  
    public final int compareTo(Operator o) { //per priorità 
        Integer me, you;
        me = this.type.prio;
        you = o.type.prio;
        return me.compareTo(you);
    }
    
    public Operators getType () {
        return this.type;
    }
    
    public int getPrio () {
        return type.prio;
    }

    public String toString () {
        return this.type.s;
    }

    public static Operator getAdd (int pos) {
        return new Operator(pos, Operators.ADDITION);
    }

    public static Operator getSub (int pos) {
        return new Operator(pos, Operators.SUBSTRACTION);
    }

    public static Operator getMul (int pos) {
        return new Operator(pos, Operators.MULTIPLICATION);
    }

    public static Operator getDiv (int pos) {
        return new Operator(pos, Operators.DIVISION);
    }

    public Operator clone() {
        return new Operator(this.getPos(), this.type);
    }

    public Pattern getRegex() {
        //TODO scrivere
        throw new UnsupportedOperationException("Not supported yet.");
    }
    
}