@Override
    public boolean equals(Object obj) {
        if (!(obj instanceof PolicyDirective)) {
            return false;
        }
        PolicyDirective rhs = (PolicyDirective)obj;
        if (!name.equals(rhs.name)) {
            return false;
        }
        if (param == null && rhs.param != null) {
            return false;
        }
        if (param != null && !param.equals(rhs.param)) {
            return false;
        }
        return true;
    }
Returns the parameter string for this policy directive.

@return The parameter.
messagebus/src/main/java/com/yahoo/messagebus/routing/PolicyDirective.java