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

        ((jsonClazz == null || jsonClazz == JSONObject.class) && Geometry.class
            .isAssignableFrom(clazz)));
  }


  public ObjectMatch tryUnmarshall(SerializerState state, Class clazz, Object o) throws UnmarshallException {
    JSONObject jso = (JSONObject) o;
    String type = jso.getString(ATTRIBUTE_TYPE);
    if (type == null) {
      throw new UnmarshallException("no type hint");
    }
    int srid = jso.getInt(ATTRIBUTE_SRID);
    if (srid <= 0) {
      throw new UnmarshallException("no srid");
    }
    int precision = jso.getInt(ATTRIBUTE_PRECISION);
    if (precision <= 0) {
      throw new UnmarshallException("no precision");
    }
    if (!(type.equals(org.geomajas.geometry.Geometry.POINT) ||
        type.equals(org.geomajas.geometry.Geometry.LINE_STRING) ||
        type.equals(org.geomajas.geometry.Geometry.POLYGON) ||
        type.equals(org.geomajas.geometry.Geometry.LINEAR_RING) ||
        type.equals(org.geomajas.geometry.Geometry.MULTI_LINE_STRING) ||
        type.equals(org.geomajas.geometry.Geometry.MULTI_POLYGON))) {
      throw new UnmarshallException(type + " is not a supported geometry");
    }
    JSONArray coordinates = jso.getJSONArray(ATTRIBUTE_COORDINATES);
    if (coordinates == null) {
      throw new UnmarshallException("coordinates missing");
    }
    return ObjectMatch.OKAY;
  }

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    }
    return ObjectMatch.OKAY;
  }


  public Object unmarshall(SerializerState state, Class clazz, Object o) throws UnmarshallException {
    JSONObject jso = (JSONObject) o;
    String type = jso.getString(ATTRIBUTE_TYPE);
    if (type == null) {
      throw new UnmarshallException("no type hint");
    }
    int srid = jso.getInt(ATTRIBUTE_SRID);
    int precision = jso.getInt(ATTRIBUTE_PRECISION);
    GeometryFactory factory = new GeometryFactory(new PrecisionModel(Math.pow(10, precision)), srid);


    Geometry geometry = null;
    if (type.equals(org.geomajas.geometry.Geometry.POINT)) {
      geometry = createPoint(factory, jso);

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    }
    return geometry;
  }


  private Polygon createPolygon(GeometryFactory factory, JSONObject jso) throws UnmarshallException {
    JSONObject jsoShell = jso.getJSONObject("shell");
    LinearRing shell = createLinearRing(factory, jsoShell);


    JSONArray holeArray = jso.getJSONArray("holes");
    LinearRing[] holes = new LinearRing[holeArray.length()];
    for (int i = 0; i < holeArray.length(); i++) {
      JSONObject jsoHole = holeArray.getJSONObject(i);
      holes[i] = createLinearRing(factory, jsoHole);
    }
    return factory.createPolygon(shell, holes);
  }

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  private LinearRing createLinearRing(GeometryFactory factory, JSONObject jso) throws UnmarshallException {
    JSONArray coords = jso.getJSONArray(ATTRIBUTE_COORDINATES);
    Coordinate[] coordinates = new Coordinate[coords.length()];
    for (int i = 0; i < coords.length(); i++) {
      JSONObject nextCoord = coords.getJSONObject(i);
      if (nextCoord == null) {
        throw new UnmarshallException("inner coordinate missing");
      }
      coordinates[i] = new Coordinate(nextCoord.getDouble("x"), nextCoord.getDouble("y"));
    }
    coordinates = checkIfClosed(coordinates);
    return factory.createLinearRing(coordinates);
  }

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    if (jsonCoords == null) {
      throw new UnmarshallException("coordinates missing");
    }
    Coordinate[] coordinates = new Coordinate[jsonCoords.length()];
    for (int i = 0; i < jsonCoords.length(); i++) {
      JSONObject nextCoord = jsonCoords.getJSONObject(i);
      if (nextCoord == null) {
        throw new UnmarshallException("inner coordinate missing");
      }
      coordinates[i] = new Coordinate(nextCoord.getDouble("x"), nextCoord.getDouble("y"));
    }
    geometry = new LineString(new CoordinateArraySequence(coordinates), factory);
    return geometry;
  }

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      throw new UnmarshallException("coordinates missing");
    }
    if (jsonCoords.length() != 1) {
      throw new UnmarshallException("wrong number of coordinates " + jsonCoords.length() + " for point");
    }
    JSONObject coord = jsonCoords.getJSONObject(0);
    if (coord == null) {
      throw new UnmarshallException("inner coordinate missing");
    }


    Coordinate coordinate = new Coordinate(coord.getDouble("x"), coord.getDouble("y"));
    geometry = new Point(new CoordinateArraySequence(new Coordinate[] {coordinate}), factory);
    return geometry;
  }

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    }
    return factory.createMultiLineString(lineStrings);
  }


  public Object marshall(SerializerState state, Object o) throws MarshallException {
    JSONObject obj;
    Geometry geometry = (Geometry) o;


    if (geometry instanceof Point) {
      obj = fromPoint((Point) geometry);
    } else if (geometry instanceof LineString) {

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      jso.put(ATTRIBUTE_PRECISION, precision);
    }
  }


  private JSONObject fromPoint(Point p) {
    JSONObject jso = new JSONObject();
    JSONArray coordinates = new JSONArray();
    PrecisionModel precisionmodel = p.getPrecisionModel();
    coordinates.put(precisionmodel.makePrecise(p.getX()));
    coordinates.put(precisionmodel.makePrecise(p.getY()));
    putBasics(jso, p);
    jso.put(ATTRIBUTE_COORDINATES, coordinates);
    return jso;
  }

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    jso.put(ATTRIBUTE_COORDINATES, coordinates);
    return jso;
  }


  private JSONObject fromMultiPoint(MultiPoint mp) {
    JSONObject jso = new JSONObject();
    JSONArray polys = new JSONArray();
    for (int i = 0; i < mp.getNumGeometries(); i++) {
      polys.put(fromPoint((Point) mp.getGeometryN(i)));
    }
    jso.put("points", polys);
    putBasics(jso, mp);
    return jso;
  }

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    return jso;
  }


  private JSONObject fromLineString(LineString ls) {
    PrecisionModel precisionmodel = ls.getPrecisionModel();
    JSONObject jso = new JSONObject();
    JSONArray coordinates = new JSONArray();
    for (int i = 0; i < ls.getCoordinates().length; i++) {
      coordinates.put(precisionmodel.makePrecise(ls.getCoordinates()[i].x));
      coordinates.put(precisionmodel.makePrecise(ls.getCoordinates()[i].y));
    }
    putBasics(jso, ls);
    jso.put(ATTRIBUTE_COORDINATES, coordinates);
    return jso;
  }

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