Particle.java

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package cedar.jetweb.model;

import java.util.Vector;
import java.util.Enumeration;

import cedar.jetweb.*;
import cedar.jetweb.util.Match;
import cedar.jetweb.db.DBManager;

public class Particle  {

    private double energy;
    private String name;
    private int hashCode_;
    private boolean dirtyHashCode_;

    public static String PROTON = "p";
    public static String ANTIPROTON = "pbar";
    public static String POSITRON = "e+";
    public static String ELECTRON = "e-";
    public static String PHOTON = "gamma";


    public Particle() {}
    public Particle(String desc,double E) {
    name=desc;
    energy=E;
    dirtyHashCode_=true;
    }

    public double getEnergy(){
    return energy;
    }
 
    public void setEnergy(double e){
    dirtyHashCode_=true;
    energy=e;
    }
    public String getName(){ return name; }


    public String toString(){
    return energy+" GeV "+name;
    }

    public void setName(String p){
    dirtyHashCode_=true;
    name = p;
    }
    public boolean equals(Object obj){

    if (obj==null) { return false; }

    if ( !this.getClass().equals(obj.getClass())  ) { return false; }

    Particle c = (Particle)obj;
    return (name.equals(c.getName()) && 
            Match.compareDouble(energy,c.getEnergy()));         
    }

    public int hashCode(){ 
    if (dirtyHashCode_){
        hashCode_ = (new Double(energy)).hashCode()+name.hashCode();
        dirtyHashCode_=false;
    }
    return hashCode_; 
    }
 

}

Generated Wed Jan 17 09:14:27 GMT 2007