le-annen.javaserver.0.1.source-code.Router Maven / Gradle / Ivy

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A minimal java http server which fulfills small portions of the http specifications. This is not a full fledged or secure server. It should only be used for learning purposes and contains no guarantees of any king.

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import java.io.File;
import java.io.IOException;
import java.util.HashMap;

class Router implements RouterInterface {
  private HashMap router = new HashMap<>();

  void addRoute(
          String httpMethod,
          String route,
          ControllerInterface controller) {
    Boolean methodRouteExists = router.keySet().contains(httpMethod);
    Routes routes;
    if(methodRouteExists) { routes = router.get(httpMethod);} else { routes = new Routes();}
    Boolean pathRouteExists = routes.getRoutePaths().contains(route);
    if(!pathRouteExists) { routes.add(route, controller); }
    router.put(httpMethod, routes);
  }

  Routes getRoutes(String httpMethod) {
    return router.get(httpMethod);
  }

  @Override
  public ResponseParameters route(RequestParameters requestParameters) throws IOException {

    String httpMethod = requestParameters.getHttpVerb();
    File file = new File(requestParameters.getDirectoryPath() +
            requestParameters.getRequestPath());
    Boolean isDirectory = file.isDirectory();
    Boolean isFile = file.exists() && !isDirectory;
    Boolean methodExists = router.keySet().contains(httpMethod);
    Boolean routeExists = router
            .get(httpMethod)
            .getRoutePaths()
            .contains(requestParameters.getRequestPath());

    if(methodExists && routeExists) {
      Routes routes = router.get(httpMethod);
      return routes.getResponse(requestParameters);
    } else if(isDirectory) {
      ControllerDirectory controllerDirectory = new ControllerDirectory();
      return dynamicRoute(requestParameters, controllerDirectory);
    } else if(isFile) {
      ControllerFile controllerFile = new ControllerFile();
      return dynamicRoute(requestParameters, controllerFile);
    } else {
      return new ControllerFourOhFour().getResponse(requestParameters);
    }
  }

  private ResponseParameters dynamicRoute(
          RequestParameters requestParameters,
          ControllerInterface controllerInterface) throws IOException {
    Routes dynamicRoutes = new Routes();
    String route = requestParameters.getRequestPath();
    dynamicRoutes.add(route, controllerInterface);
    return dynamicRoutes.getResponse(requestParameters);
  }
}