Examples of org.json.JSONObject

org.json.JSONObject
A JSONObject is an unordered collection of name/value pairs. Its external form is a string wrapped in curly braces with colons between the names and values, and commas between the values and names. The internal form is an object having get and opt methods for accessing the values by name, and put methods for adding or replacing values by name. The values can be any of these types: Boolean, JSONArray, JSONObject, Number, String, or the JSONObject.NULL object. A JSONObject constructor can be used to convert an external form JSON text into an internal form whose values can be retrieved with the get and opt methods, or to convert values into a JSON text using the put and toString methods. A get method returns a value if one can be found, and throws an exception if one cannot be found. An opt method returns a default value instead of throwing an exception, and so is useful for obtaining optional values.
The generic get() and opt() methods return an object, which you can cast or query for type. There are also typed get and opt methods that do type checking and type coercion for you. The opt methods differ from the get methods in that they do not throw. Instead, they return a specified value, such as null.
The put methods add or replace values in an object. For example,
```
 myString = new JSONObject().put("JSON", "Hello, World!").toString(); 
```
produces the string {"JSON": "Hello, World"}.
The texts produced by the toString methods strictly conform to the JSON syntax rules. The constructors are more forgiving in the texts they will accept:
- An extra , (comma) may appear just before the closing brace.
- Strings may be quoted with ' (single quote).
- Strings do not need to be quoted at all if they do not begin with a quote or single quote, and if they do not contain leading or trailing spaces, and if they do not contain any of these characters: { } [ ] / \ : , # and if they do not look like numbers and if they are not the reserved words true, false, or null.
@author JSON.org @version 2014-05-03

      }


      String metadata_ = GadgetUtil.fetchGagdetMetadata(url);
      try
      {
         JSONObject jsonObj = new JSONObject(metadata_);
         JSONObject obj = jsonObj.getJSONArray("gadgets").getJSONObject(0);
         String token = GadgetUtil.createToken(url, new Long(hashCode()));
         obj.put("secureToken", token);
         metadata_ = jsonObj.toString();
      }
      catch (JSONException e)
      {
         e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.

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    private JSONObject getId(JsonAPI api, HttpServletRequest req)
    {
        String path = req.getRequestURI().substring(req.getContextPath().length() + req.getServletPath().length());
        StringTokenizer tokenizer = new StringTokenizer(path, "/");
        String className = tokenizer.nextToken(); // ignore class name
        JSONObject id = new JSONObject();
        try
        {
            if (tokenizer.hasMoreTokens())
            {
                String token = tokenizer.nextToken();
                if (token == null)
                {
                    return null;
                }
                AbstractClassMetaData cmd = api.getMetaDataManager()
                        .getMetaDataForClass(className, api.getClassLoaderResolver());
                if (cmd != null && cmd.usesSingleFieldIdentityClass())
                {
                    Object value = TypeConversionHelper.convertTo(token,
                        cmd.getMetaDataForMemberAtRelativePosition(cmd.getPKMemberPositions()[0]).getType());
                    id.put("id", value);


                    return id;
                }
                id.put("id", token);


                return id;
            }
            try
            {
                if (req.getContentLength() > 0)
                {
                    char[] buffer = new char[req.getContentLength()];
                    req.getReader().read(buffer);
                    String idtext = new String(buffer);
                    idtext = URLDecoder.decode(idtext, "UTF-8");
                    // if it's a JSONObject
                    JSONObject jsonobj = new JSONObject(idtext);
                    return jsonobj;
                }
            }
            catch (IOException e)
            {

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                    cmd = api.getMetaDataManager().getMetaDataForClass(className, clr);
                }
            }
            catch (ClassNotResolvedException ex)
            {
                JSONObject error = new JSONObject();
                error.put("exception", ex.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(404);
                resp.setHeader("Content-Type", "application/json");
                return;
            }
            JSONObject id = getId(api, req);
            if (id == null)
            {
                // no id provided
                try
                {
                    // get the whole extent
                    String queryString = "SELECT FROM " + cmd.getFullClassName();
                    if (req.getQueryString() != null)
                    {
                        // query by filter
                        queryString += " WHERE " + URLDecoder.decode(req.getQueryString(), "UTF-8");
                    }
                    try
                    {
                        api.getTransaction().begin();
                        Query query = api.newQuery("JDOQL", queryString);
                        List result = (List)query.execute();
                        JSONArray array = new JSONArray(result);
                        resp.getWriter().write(array.toString());
                        resp.setHeader("Content-Type", "application/json");
                        resp.setStatus(200);
                        api.getTransaction().commit();
                    }
                    finally
                    {
                        if (api.getTransaction().isActive())
                        {
                            api.getTransaction().rollback();
                        }
                        api.close();
                    }
                    return;
                }
                catch (NucleusUserException e)
                {
                    JSONObject error = new JSONObject();
                    error.put("exception", e.getMessage());
                    resp.getWriter().write(error.toString());
                    resp.setStatus(400);
                    resp.setHeader("Content-Type", "application/json");
                    return;
                }
                catch (NucleusException ex)
                {
                    JSONObject error = new JSONObject();
                    error.put("exception", ex.getMessage());
                    resp.getWriter().write(error.toString());
                    resp.setStatus(404);
                    resp.setHeader("Content-Type", "application/json");
                    return;
                }
                catch (RuntimeException ex)
                {
                    ex.printStackTrace();
                    // errors from the google appengine may be raised when running queries
                    JSONObject error = new JSONObject();
                    error.put("exception", ex.getMessage());
                    resp.getWriter().write(error.toString());
                    resp.setStatus(404);
                    resp.setHeader("Content-Type", "application/json");
                    return;
                }
            }
            if (cmd.getIdentityType() != IdentityType.APPLICATION)
            {
                JSONObject error = new JSONObject();
                error.put("exception", "Only application identity types are support.");
                resp.getWriter().write(error.toString());
                resp.setStatus(404);
                resp.setHeader("Content-Type", "application/json");
                return;
            }
            try
            {
                api.getTransaction().begin();
                id.put("class", getClassNameForPath(req));
                Object result = api.findObject(id);
                resp.getWriter().write(result.toString());
                resp.setHeader("Content-Type", "application/json");
                api.getTransaction().commit();
                return;
            }
            catch (NucleusObjectNotFoundException ex)
            {
                resp.setContentLength(0);
                resp.setStatus(404);
                return;
            }
            catch (NucleusException ex)
            {
                JSONObject error = new JSONObject();
                error.put("exception", ex.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(404);
                resp.setHeader("Content-Type", "application/json");
                return;
            }
            finally
            {
                if (api.getTransaction().isActive())
                {
                    api.getTransaction().rollback();
                }
                api.close();
            }


        }
        catch (JSONException e)
        {
            try
            {
                JSONObject error = new JSONObject();
                error.put("exception", e.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(404);
                resp.setHeader("Content-Type", "application/json");
            }
            catch (JSONException e1)
            {

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        catch (ClassNotResolvedException ex)
        {
            resp.setStatus(404);
            return;
        }
        JSONObject id = getId(api, req);
        if (id == null)
        {
            // no id provided
            try
            {
                // get the whole extent
                String queryString = "SELECT FROM " + cmd.getFullClassName();
                if (req.getQueryString() != null)
                {
                    // query by filter
                    queryString += " WHERE " + URLDecoder.decode(req.getQueryString(), "UTF-8");
                }
                try
                {
                    api.getTransaction().begin();
                    Query query = api.newQuery("JDOQL", queryString);
                    /* Object result = */query.execute();
                    resp.setStatus(200);
                    api.getTransaction().commit();
                }
                finally
                {
                    if (api.getTransaction().isActive())
                    {
                        api.getTransaction().rollback();
                    }
                    api.close();
                }
                return;
            }
            catch (NucleusUserException e)
            {
                resp.setStatus(400);
                return;
            }
            catch (NucleusException ex)
            {
                resp.setStatus(404);
                return;
            }
            catch (RuntimeException ex)
            {
                resp.setStatus(404);
                return;
            }
        }
        if (cmd.getIdentityType() != IdentityType.APPLICATION)
        {
            resp.setStatus(404);
            return;
        }
        try
        {
            api.getTransaction().begin();
            id.put("class", getClassNameForPath(req));
            api.findObject(id);
            resp.setStatus(200);
            api.getTransaction().commit();
            return;
        }

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            return;
        }
        char[] buffer = new char[req.getContentLength()];
        req.getReader().read(buffer);
        String str = new String(buffer);
        JSONObject jsonobj;
        try
        {
            api.getTransaction().begin();
            jsonobj = new JSONObject(str);
            jsonobj.put("class", getClassNameForPath(req));
            api.persist(jsonobj);
            resp.getWriter().write(jsonobj.toString());
            resp.setHeader("Content-Type", "application/json");
            api.getTransaction().commit();
        }
        catch (ClassNotResolvedException e)
        {
            try
            {
                JSONObject error = new JSONObject();
                error.put("exception", e.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(500);
                resp.setHeader("Content-Type", "application/json");
                LOGGER_REST.error(e.getMessage(), e);
            }
            catch (JSONException e1)
            {
                throw new RuntimeException(e1);
            }
        }
        catch (NucleusUserException e)
        {
            try
            {
                JSONObject error = new JSONObject();
                error.put("exception", e.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(400);
                resp.setHeader("Content-Type", "application/json");
                LOGGER_REST.error(e.getMessage(), e);
            }
            catch (JSONException e1)
            {
                throw new RuntimeException(e1);
            }
        }
        catch (NucleusException e)
        {
            try
            {
                JSONObject error = new JSONObject();
                error.put("exception", e.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(500);
                resp.setHeader("Content-Type", "application/json");
                LOGGER_REST.error(e.getMessage(), e);
            }
            catch (JSONException e1)
            {
                throw new RuntimeException(e1);
            }
        }
        catch (JSONException e)
        {
            try
            {
                JSONObject error = new JSONObject();
                error.put("exception", e.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(500);
                resp.setHeader("Content-Type", "application/json");
                LOGGER_REST.error(e.getMessage(), e);
            }
            catch (JSONException e1)

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            }
            catch (ClassNotResolvedException ex)
            {
                try
                {
                    JSONObject error = new JSONObject();
                    error.put("exception", ex.getMessage());
                    resp.getWriter().write(error.toString());
                    resp.setStatus(404);
                    resp.setHeader("Content-Type", "application/json");
                }
                catch (JSONException e)
                {
                    // will not happen
                }
                return;
            }


            api.getTransaction().begin();
            JSONObject id = getId(api, req);
            id.put("class", getClassNameForPath(req));
            api.deleteObject(id);
            api.getTransaction().commit();
        }
        catch (NucleusObjectNotFoundException ex)
        {
            try
            {
                JSONObject error = new JSONObject();
                error.put("exception", ex.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(400);
                resp.setHeader("Content-Type", "application/json");
                return;
            }
            catch (JSONException e)
            {
                // will not happen
            }
        }
        catch (NucleusUserException e)
        {
            try
            {
                JSONObject error = new JSONObject();
                error.put("exception", e.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(400);
                resp.setHeader("Content-Type", "application/json");
                return;
            }
            catch (JSONException e1)
            {
                // ignore
            }
        }
        catch (NucleusException e)
        {
            try
            {
                JSONObject error = new JSONObject();
                error.put("exception", e.getMessage());
                resp.getWriter().write(error.toString());
                resp.setStatus(500);
                resp.setHeader("Content-Type", "application/json");
                LOGGER_REST.error(e.getMessage(), e);
            }
            catch (JSONException e1)

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      // good
    }
  }


  public void testWriteJSONObject() throws Exception {
    JSONObject json = new JSONObject();
    json.put("k1", 1);
    json.put("k2", true);
    json.put("k3", 2.2);
    JavascriptAppender.INSTANCE.append(out, gxpContext, json);
    assertOutputEquals("{\"k3\":2.2,\"k1\":1,\"k2\":true}");


    json = null;
    try {

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    GeometrySerializer ser = new GeometrySerializer();
    GeometryFactory factory = new GeometryFactory(new PrecisionModel(100.0), 31300);
    CoordinateArraySequence coords = new CoordinateArraySequence(new Coordinate[] {new Coordinate(
        12.3456, 34567.3456)});
    Point p = new Point(coords, factory);
    JSONObject jo = (JSONObject) ser.marshall(null, p);
    assertEquals("Point", jo.get("type").toString());
    assertEquals("31300", jo.get("srid").toString());
    assertEquals("2", jo.get("precision").toString());
    assertEquals("[12.35,34567.35]", jo.get("coordinates").toString());
  }

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    GeometrySerializer ser = new GeometrySerializer();
    GeometryFactory factory = new GeometryFactory(new PrecisionModel(100.0), 31300);
    CoordinateArraySequence coords = new CoordinateArraySequence(new Coordinate[] {
        new Coordinate(12.0, 34.23), new Coordinate(12.000, 54.555), new Coordinate(-0.01, -0.0)});
    LineString p = new LineString(coords, factory);
    JSONObject jo = (JSONObject) ser.marshall(null, p);
    assertEquals("LineString", jo.get("type").toString());
    assertEquals("31300", jo.get("srid").toString());
    assertEquals("2", jo.get("precision").toString());
    assertEquals("[12,34.23,12,54.56,-0.01,0]", jo.get("coordinates").toString());
  }

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    CoordinateArraySequence coords = new CoordinateArraySequence(new Coordinate[] {
        new Coordinate(12.0, 34.23), new Coordinate(12.000, 54.555), new Coordinate(7, 8),
        new Coordinate(12.0, 34.23)});
    LinearRing ring = new LinearRing(coords, factory);
    Polygon p = new Polygon(ring, new LinearRing[] {}, factory);
    JSONObject jo = (JSONObject) ser.marshall(null, p);
    assertEquals("Polygon", jo.get("type").toString());
    assertEquals("[]", jo.get("holes").toString());
    assertEquals("31300", jo.get("srid").toString());
    assertEquals("2", jo.get("precision").toString());
    JSONObject shell = jo.getJSONObject("shell");
    assertEquals("LineString", shell.get("type").toString());
    assertEquals("31300", shell.get("srid").toString());
    assertEquals("2", shell.get("precision").toString());
    assertEquals("[12,34.23,12,54.56,7,8,12,34.23]", shell.get("coordinates").toString());
  }

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