Subversion Repositories bacoAlunos

package pt.estgp.es.exemplos.hibernate.web.rest;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import pt.estgp.es.exemplos.hibernate.utils.StreamsUtils;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.io.InputStream;

import java.io.PrintWriter;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.ArrayList;

import java.util.List;

public abstract class AbstractRestServlet extends HttpServlet

{

    public void addMessage(1.5.0/docs/api/java/lang/String.html">String mensagem, HttpServletRequest request)

    {

        List<String> messages = (List<String>) request.getAttribute("Messages");

        messages.add(mensagem);

    }

    @1.5.0/docs/api/java/lang/Override.html">Override

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, 1.5.0/docs/api/java/io/IOException.html">IOException {

        process(req,resp);

    }

    @1.5.0/docs/api/java/lang/Override.html">Override

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, 1.5.0/docs/api/java/io/IOException.html">IOException {

        process(req,resp);

    }

    protected void process(HttpServletRequest req, HttpServletResponse resp) throws ServletException, 1.5.0/docs/api/java/io/IOException.html">IOException

    {

        req.setAttribute("Messages",new ArrayList<String>());

        if(req.getContentType() != null && req.getContentType().equalsIgnoreCase("application/json"))

        {

            5+0%2Fdocs%2Fapi+InputStream">InputStream content = req.getInputStream();

            if(content != null)

            {

                try {

                    ParseJsonRequestResult parseJsonRequestResult = new ParseJsonRequestResult(content).invoke();

                    invokeService(req, resp, parseJsonRequestResult.getService(), parseJsonRequestResult.getData());

                } catch (1.5.0/docs/api/java/lang/Throwable.html">Throwable e) {

                    sendErrorResponse(resp, e);

                }

            }

        }

        else

        {

            JSONObject response = new JSONObject();

            try {

                response.put("service","error");

                response.put("response","REST REQUEST REQUIRED");

                resp.setContentType("application/json");

                1.5.0/docs/api/java/io/PrintWriter.html">PrintWriter pw = resp.getWriter();

                pw.write(response.toString());

            } catch (JSONException e) {

                e.printStackTrace();

            }

        }

    }

    private void invokeService(HttpServletRequest req, HttpServletResponse resp, 1.5.0/docs/api/java/lang/String.html">String service, JSONObject data) throws 1.5.0/docs/api/java/lang/NoSuchMethodException.html">NoSuchMethodException, 1.5.0/docs/api/java/lang/IllegalAccessException.html">IllegalAccessException, 1.5.0/docs/api/java/lang/reflect/InvocationTargetException.html">InvocationTargetException, JSONException, 1.5.0/docs/api/java/io/IOException.html">IOException {

        1.5.0/docs/api/java/lang/reflect/Method.html">Method innerMethod = this.getClass().getMethod(service,new 1.5.0/docs/api/java/lang/Class.html">Class[]{

                JSONObject.class,

                HttpServletRequest.class,

                HttpServletResponse.class});

        JSONObject obj = (JSONObject) innerMethod.invoke(this,new 5+0%2Fdocs%2Fapi+Object">Object[]{data,req,resp});

        JSONObject response = new JSONObject();

        response.put("service","ok");

        response.put("response",obj);

        List<String> messages = (List<String>) req.getAttribute("Messages");

        if(messages.size() > 0)

        {

            JSONArray msgs = new JSONArray();

            for(1.5.0/docs/api/java/lang/String.html">String msgAdded: messages)

            {

                msgs.put(msgAdded);

            }

            response.put("messages",msgs);

        }

        resp.setContentType("application/json");

        1.5.0/docs/api/java/io/PrintWriter.html">PrintWriter pw = resp.getWriter();

        pw.write(response.toString());

    }

    private void sendErrorResponse(HttpServletResponse resp, 1.5.0/docs/api/java/lang/Throwable.html">Throwable e) throws 1.5.0/docs/api/java/io/IOException.html">IOException {

        e.printStackTrace();

        JSONObject response = new JSONObject();

        try {

            if(e instanceof 1.5.0/docs/api/java/lang/reflect/InvocationTargetException.html">InvocationTargetException)

            {

                if(((1.5.0/docs/api/java/lang/reflect/InvocationTargetException.html">InvocationTargetException) e).getTargetException() != null)

                {

                    e = ((1.5.0/docs/api/java/lang/reflect/InvocationTargetException.html">InvocationTargetException) e).getTargetException();

                }

            }

            response.put("service","error");

            response.put("exception",e.toString());

            resp.setContentType("application/json");

            1.5.0/docs/api/java/io/PrintWriter.html">PrintWriter pw = resp.getWriter();

            pw.write(response.toString());

        } catch (JSONException e1) {

            e1.printStackTrace();

        }

    }

    private class ParseJsonRequestResult {

        private 5+0%2Fdocs%2Fapi+InputStream">InputStream content;

        private 1.5.0/docs/api/java/lang/String.html">String service;

        private JSONObject data;

        public ParseJsonRequestResult(5+0%2Fdocs%2Fapi+InputStream">InputStream content) {

            this.content = content;

        }

        public 1.5.0/docs/api/java/lang/String.html">String getService() {

            return service;

        }

        public JSONObject getData() {

            return data;

        }

        public ParseJsonRequestResult invoke() throws 1.5.0/docs/api/java/io/IOException.html">IOException, JSONException {

            JSONObject requestObj;

            1.5.0/docs/api/java/lang/String.html">String json = StreamsUtils.readString(content);

            requestObj = new JSONObject(json);

            1.5.0/docs/api/java/lang/System.html">System.out.println("REQUEST JSON:");

            1.5.0/docs/api/java/lang/System.html">System.out.println(requestObj.toString());

            service = requestObj.getString("service");

            data = requestObj.has("data") ? requestObj.getJSONObject("data") : null;

            return this;

        }

    }

}