/**
* Returns a JSON object (as {@link Map}<String, Object>) of the wrapped erlang value.
*
* @return the converted value
* @throws ClassCastException if thrown if a conversion is not possible, i.e. the type is not
* supported
*/
public Map<String, Object> jsonValue() throws ClassCastException {
/*
* object(): {struct, [{key::string() | atom(), value()}]}
* array(): {array, [value()]}
* value(): number(), string(), object(), array(), 'true', 'false', 'null'
*
* first term must be an object!
*/
final OtpErlangTuple value_tpl = (OtpErlangTuple) value;
if ((value_tpl.arity() == 2) && value_tpl.elementAt(0).equals(CommonErlangObjects.structAtom)) {
final ErlangValueJSONToMap json_converter = new ErlangValueJSONToMap();
return json_converter.toJava((OtpErlangList) value_tpl.elementAt(1));
} else {
throw new ClassCastException("wrong tuple arity");
}
}
/**
* Converts a (supported) Java type to an {@link OtpErlangObject}.
*
* @param <T> the type of the value
* @param value the value to convert to an erlang type
* @return the converted value
* @throws ClassCastException if thrown if a conversion is not possible, i.e. the type is not
* supported
*/
public static <T> OtpErlangObject convertToErlang(final T value) throws ClassCastException {
if (value instanceof Boolean) {
return new OtpErlangBoolean((Boolean) value);
} else if (value instanceof Integer) {
return new OtpErlangLong((Integer) value);
} else if (value instanceof Long) {
return new OtpErlangLong((Long) value);
} else if (value instanceof BigInteger) {
return new OtpErlangLong((BigInteger) value);
} else if (value instanceof Double) {
return new OtpErlangDouble((Double) value);
} else if (value instanceof String) {
return new OtpErlangString((String) value);
} else if (value instanceof byte[]) {
return new OtpErlangBinary((byte[]) value);
} else if (value instanceof List<?>) {
final List<?> list = (List<?>) value;
final int listSize = list.size();
final OtpErlangObject[] erlValue = new OtpErlangObject[listSize];
int i = 0;
// TODO: optimise for specific lists?
for (final Object iter : list) {
erlValue[i] = convertToErlang(iter);
++i;
}
return new OtpErlangList(erlValue);
} else if (value instanceof Map<?, ?>) {
// map to JSON object notation of Scalaris
@SuppressWarnings("unchecked")
final Map<String, Object> map = (Map<String, Object>) value;
final ErlangValueJSONToMap json_converter = new ErlangValueJSONToMap();
return json_converter.toScalarisJSON(map);
} else if (value instanceof ErlangValue) {
return ((ErlangValue) value).value();
} else if (value instanceof OtpErlangObject) {
return (OtpErlangObject) value;
} else {
// map to JSON object notation of Scalaris
@SuppressWarnings("unchecked")
final ErlangValueJSONToBean<T> json_converter =
new ErlangValueJSONToBean<T>((Class<T>) value.getClass());
return json_converter.toScalarisJSON(value);
// throw new ClassCastException("Unsupported type (value: " + value.toString() +
// ")");
}
}
