BaseHttpHandler.java

package http.handler;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.sun.net.httpserver.HttpExchange;
import http.LocalDataTimeAdapter;
import managers.TaskManager;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;

public class BaseHttpHandler {

    protected  TaskManager manager;
    protected  Gson gson;

    protected String readText(HttpExchange httpExchange) throws IOException {
        return new String(httpExchange.getRequestBody().readAllBytes(), StandardCharsets.UTF_8);
    }

    protected void sendText(HttpExchange httpExchange, String text) throws IOException {
        byte[] result = text.getBytes(StandardCharsets.UTF_8);
        httpExchange.getResponseHeaders().add("Content-Type", "application/json;charset=utf-8");
        httpExchange.sendResponseHeaders(200, result.length);
        OutputStream os = httpExchange.getResponseBody();
        os.write(result);
        httpExchange.close();
    }

    protected void sendNotFound(HttpExchange httpExchange) throws IOException {
        httpExchange.sendResponseHeaders(404, 0);
        httpExchange.close();
    }

    protected void sendHasInteractions(HttpExchange httpExchange) throws IOException {
        httpExchange.sendResponseHeaders(406, 0);
        httpExchange.close();
    }

    protected void sendOk(HttpExchange httpExchange) throws IOException {
        httpExchange.sendResponseHeaders(201, 0);
        httpExchange.close();
    }

    protected void sendErr(HttpExchange httpExchange) throws IOException {
        httpExchange.sendResponseHeaders(500, 0);
        httpExchange.close();
    }

    protected void sendBadRequest(HttpExchange httpExchange) throws IOException {
        httpExchange.sendResponseHeaders(400, 0);
        httpExchange.close();
    }

    protected void sendMethodNotAllowed(HttpExchange httpExchange) throws IOException {
        httpExchange.sendResponseHeaders(405, 0);
        httpExchange.close();
    }

    public static Gson getGson() {
        GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.registerTypeAdapter(LocalDateTime.class, new LocalDataTimeAdapter());
        return gsonBuilder.create();
    }
}