Collision.java

Go to the documentation of this file.

package cedar.jetweb.model;

import java.util.Collection;
import java.util.Vector;
import java.util.HashMap;
import java.util.Enumeration;

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

public class Collision implements Storeable {

    private double ecms = -1.0;
    //private Vector<Particle> particles = new Vector<Particle>();
    private HashMap<Integer, Particle> particles = 
    new HashMap<Integer, Particle>();
    private int collisionId=0;
    private Particle particle1;
    private Particle particle2;

    public Collision(int id) throws JetWebException {

    collisionId = id;
    retrieve();

    }
    public Collision() {
    }

    public Collision addParticle(Particle p, Integer pNumber)
    throws JetWebException{
    if(pNumber >2){
        throw new JetWebException("Too many particles for this collision",
                      p.getName());
    }
    particles.put(pNumber, p);

    return this;
    }
    
    public void addParticle(Particle p) 
    throws JetWebException {

    if(particles.size()>=2){
        throw new JetWebException("Too many particles for this collision",
                      p.getName());
    }

    Integer pNumber = null;
    Integer ii=1;
    while(pNumber==null){
        if (particles.get(ii)==null){
        pNumber = ii;
        } 
        ++ii;
    }

    if(pNumber >2){
        throw new JetWebException("Too many particles for this collision",
                      p.getName());
    }

    particles.put(pNumber, p);
    }


    public Collection<Particle> getParticles(){
    return particles.values();
    }

    public Integer getNumberOfParticles(){
    return(particles.size());
    }

    public void setId(int id){collisionId = id; }

    public Particle getParticle1(){ return particles.get(1); }

    public Particle getParticle2(){ return particles.get(2); }

    public boolean equals(Object obj){

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

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

    Collision c = (Collision)obj;
    if (collisionId>0 && c.getId() > 0){
        return (collisionId==c.getId());
    } else {
        return (getParticle1().equals(c.getParticle1()) && 
            getParticle2().equals(c.getParticle2()) );
    }
    }

    public int hashCode(){ return collisionId; }

    public int getId() { 
    if (collisionId==0) {
        // See if this collision is one we understand.
        try {

        System.out.println("Looking up Collison Id in DB");

        DBManager.selectId(this);

        System.out.println("collision id = "+collisionId);

        } catch (Exception e){
        collisionId=-1;
        }
    }
    if (collisionId==0) collisionId=-1;
    return collisionId; 
    }

    public boolean retrieve() throws JetWebException {
    return DBManager.selectFromDB(this);
    }

    public boolean store() throws JetWebException {
    return DBManager.addToDB(this);
    }

    public double getCMEnergy(){ 
    if (ecms<0) {
        calcCME();
    }
    return ecms;
    }


    public static Vector<Collision> getAll(){
    try {
        Vector<Collision> colls = DBManager.getAllCollisions();
        return colls;
    } catch (JetWebException j) {
        System.out.println(j);
        return null;
    }
    }

    private void calcCME(){
    ecms = 2.*Math.sqrt( getParticle1().getEnergy()*
                 getParticle2().getEnergy() );
    }

    public String toString(){

    StringBuffer str = new StringBuffer();
    str.append(getParticle1().getEnergy());
    str.append(getParticle1().getName());
    str.append("_");
    str.append(getParticle2().getEnergy());
    str.append(getParticle2().getName());
    return str.toString();
    }
}

Generated Wed Jan 17 09:14:27 GMT 2007