- /**
- * Make a JSON text of an Object value. If the object has an
- * value.toJSONString() method, then that method will be used to produce the
- * JSON text. The method is required to produce a strictly conforming text.
- * If the object does not contain a toJSONString method (which is the most
- * common case), then a text will be produced by other means. If the value
- * is an array or Collection, then a JSONArray will be made from it and its
- * toJSONString method will be called. If the value is a MAP, then a
- * JSONObject will be made from it and its toJSONString method will be
- * called. Otherwise, the value's toString method will be called, and the
- * result will be quoted.
- *
- * <p>
- * Warning: This method assumes that the data structure is acyclical.
- *
- * @param value
- * The value to be serialized.
- * @return a printable, displayable, transmittable representation of the
- * object, beginning with <code>{</code> <small>(left
- * brace)</small> and ending with <code>}</code> <small>(right
- * brace)</small>.
- * @throws JSONException
- * If the value is or contains an invalid number.
- */
- public static String valueToString(Object value) throws JSONException {
- if (value == null || value.equals(null)) {
- return "null";
- }
- if (value instanceof JSONString) {
- Object object;
- try {
- object = ((JSONString) value).toJSONString();
- } catch (Exception e) {
- throw new JSONException(e);
- }
- if (object instanceof String) {
- return (String) object;
- }
- throw new JSONException("Bad value from toJSONString: " + object);
- }
- if (value instanceof Number) {
- // not all Numbers may match actual JSON Numbers. i.e. Fractions or Complex
- final String numberAsString = JSONObject.numberToString((Number) value);
- try {
- // Use the BigDecimal constructor for it's parser to validate the format.
- @SuppressWarnings("unused")
- BigDecimal unused = new BigDecimal(numberAsString);
- // Close enough to a JSON number that we will return it unquoted
- return numberAsString;
- } catch (NumberFormatException ex){
- // The Number value is not a valid JSON number.
- // Instead we will quote it as a string
- return JSONObject.quote(numberAsString);
- }
- }
- if (value instanceof Boolean || value instanceof JSONObject
- || value instanceof JSONArray) {
- return value.toString();
- }
- if (value instanceof Map) {
- Map<?, ?> map = (Map<?, ?>) value;
- return new JSONObject(map).toString();
- }
- if (value instanceof Collection) {
- Collection<?> coll = (Collection<?>) value;
- return new JSONArray(coll).toString();
- }
- if (value.getClass().isArray()) {
- return new JSONArray(value).toString();
- }
- if(value instanceof Enum<?>){
- return JSONObject.quote(((Enum<?>)value).name());
- }
- return JSONObject.quote(value.toString());