classy enums

gistfile1.java

public enum ShotType {
    PISTOL      (2,     new Vec3f(0, 0, -35),   new Vec3f(0, -1, 0),    0.99f),
    ARTILLERY   (200,   new Vec3f(0, 30, -40),  new Vec3f(0, -20, 0),   0.99f),
    FIREBALL    (1,     new Vec3f(0, 0, -10),   new Vec3f(0, 6, 0),     0.9f),
    LASER       (0.1f,  new Vec3f(0, 0, -100),  new Vec3f(0, 0, 0),     0.99f);
    
    private final float mass;
    private final Vec3f velocity;
    private final Vec3f acceleration;
    private final float damping;
    
    ShotType(float m, Vec3f v, Vec3f a, float d) {
        this.mass = m;
        this.velocity = v;
        this.acceleration = a;
        this.damping = d;
    }
    
    public void primeParticle(Particle p) {
        p.setMass(mass);
        p.setVelocity(this.velocity.x, this.velocity.y, this.velocity.z);
        p.setAcceleration(this.acceleration.x, this.acceleration.y, this.acceleration.z);
        p.setDamping(damping);
    }
    
    public ShotType next() {
        int next = this.ordinal() + 1;
        if (next >= ShotType.values().length) {
            next = 0;
        }
        return ShotType.values()[next];
    }
    
    public ShotType prev() {
        int prev = this.ordinal() - 1;
        if (prev < 0) {
            prev = ShotType.values().length - 1;
        }
        return ShotType.values()[prev];
    }
};