com.sencha.gxt.examples.resources.server.JsonTreeServlet.java Source code

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Here is the source code for com.sencha.gxt.examples.resources.server.JsonTreeServlet.java

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/**
 * Sencha GXT 4.0.1 - Sencha for GWT
 * Copyright (c) 2006-2016, Sencha Inc.
 *
 * licensing@sencha.com
 * http://www.sencha.com/products/gxt/license/
 *
 * ================================================================================
 * Evaluation/Trial License
 * ================================================================================
 * This version of Sencha GXT is licensed commercially for a limited period for
 * evaluation purposes only. Production use or use beyond the applicable evaluation
 * period is prohibited under this license.
 *
 * Please see the Sencha GXT Licensing page at:
 * http://www.sencha.com/products/gxt/license/
 *
 * For clarification or additional options, please contact:
 * licensing@sencha.com
 * ================================================================================
 *
 *
 *
 *
 *
 *
 *
 * ================================================================================
 * Disclaimer
 * ================================================================================
 * THIS SOFTWARE IS DISTRIBUTED "AS-IS" WITHOUT ANY WARRANTIES, CONDITIONS AND
 * REPRESENTATIONS WHETHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE
 * IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, MERCHANTABLE QUALITY,
 * FITNESS FOR A PARTICULAR PURPOSE, DURABILITY, NON-INFRINGEMENT, PERFORMANCE AND
 * THOSE ARISING BY STATUTE OR FROM CUSTOM OR USAGE OF TRADE OR COURSE OF DEALING.
 * ================================================================================
 */
package com.sencha.gxt.examples.resources.server;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.JSONArray;
import org.json.JSONObject;

import com.sencha.gxt.examples.resources.server.data.Folder;
import com.sencha.gxt.examples.resources.server.data.Music;

public class JsonTreeServlet extends HttpServlet {

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        try {
            String id = req.getParameter("id");

            Folder folder = Folder.findFolder(id == null ? 1 : Integer.valueOf(id));

            String xml = generateJson(folder);

            resp.setContentType("application/json");
            PrintWriter out = resp.getWriter();
            out.println(xml);
            out.flush();
        } catch (Exception e) {
            throw new ServletException(e);
        }
    }

    private String generateJson(Folder folder) throws Exception {

        JSONObject root = new JSONObject();

        JSONArray records = new JSONArray();
        root.put("records", records);

        for (int i = 0, len = folder.getSubFolders().size(); i < len; i++) {
            Folder sub = folder.getSubFolders().get(i);
            JSONObject f = new JSONObject();
            f.put("folder", true);
            f.put("name", sub.getName());
            f.put("id", sub.getId());
            records.put(f);
        }

        for (int i = 0, len = folder.getChildren().size(); i < len; i++) {
            Music m = folder.getChildren().get(i);
            JSONObject f = new JSONObject();
            f.put("folder", false);
            f.put("name", m.getName());
            f.put("id", m.getId());
            records.put(f);
        }

        return root.toString();
    }
}