public static String getPackagePath(Proto proto) {
        String javaPackage = getPackage(proto);
        return javaPackage.replace('.', '/');
    }
public static String getPackagePath ( Proto proto ) { String javaPackage = getPackage ( proto ) ; return javaPackage . replace ( '.' , '/' ) ; }
Returns a relative path where java class should be placed,
computed from java package.