public class ApiVersionCondition implements RequestCondition<ApiVersionCondition> {
    private final String version;
 
    @Override
    public ApiVersionCondition getMatchingCondition(HttpServletRequest request) {
        String header = request.getHeader("X-API-VERSION");
        return version.equals(header) ? this : null;
    }
 
    @Override
    public int compareTo(ApiVersionCondition other, HttpServletRequest request) {
        return other.version.compareTo(this.version);
    }
    // combine method omitted for brevity
}