public static Object gsonToPrimitive(JsonElement element) {
if (element.isJsonPrimitive()) {
JsonPrimitive prim = element.getAsJsonPrimitive();
if (prim.isString()) {
return prim.getAsString();
} else if (prim.isBoolean()) {
return prim.getAsBoolean();
} else if (prim.isNumber()) {
return prim.getAsNumber();
} else {
throw new IllegalArgumentException("Unknown Gson primitive: " + prim);
}
} else if (element.isJsonArray()) {
JsonArray array = element.getAsJsonArray();
List<Object> list = new ArrayList<Object>();
for (int i = 0; i < array.size(); i++) {
list.add(gsonToPrimitive(array.get(i)));
}
return list;
} else if (element.isJsonNull()) {
return null;
} else if (element.isJsonObject()) {
Map<String, Object> map = new HashMap<String, Object>();
for (Map.Entry<String, JsonElement> entry : element.getAsJsonObject().entrySet()) {
map.put(entry.getKey(), gsonToPrimitive(entry.getValue()));
}
return map;
} else {
throw new IllegalArgumentException("Unknown Gson value: " + element);
}
}
public WikidataValue snakToValue(final String type, Value snak) {
String jsonStr = null;
try {
jsonStr = mapper.writeValueAsString(snak);
} catch (JsonProcessingException e) {
throw new IllegalArgumentException("Unknown snak: " + snak);
}
final JsonElement element = new JsonParser().parse(jsonStr);
final JsonElement jsonValue =
(element.isJsonObject() && element.getAsJsonObject().has("value"))
? element.getAsJsonObject().get("value")
: null;
WikidataValue val =
snak.accept(
new ValueVisitor<WikidataValue>() {
@Override
public WikidataValue visit(EntityIdValue value) {
if (value.getEntityType().equals(EntityIdValue.ET_ITEM)) {
return WikidataValue.forItem(Integer.valueOf(value.getId().substring(1)));
} else if (value.getEntityType().equals(EntityIdValue.ET_PROPERTY)) {
throw new IllegalArgumentException("Did not expect entity property");
} else {
throw new IllegalArgumentException(
"Unknown entity type: " + value.getEntityType());
}
}
@Override
public WikidataValue visit(GlobeCoordinatesValue value) {
return new WikidataValue(type, gsonToPrimitive(jsonValue), jsonValue);
}
@Override
public WikidataValue visit(QuantityValue value) {
return new WikidataValue(type, gsonToPrimitive(jsonValue), jsonValue);
}
@Override
public WikidataValue visit(StringValue value) {
return WikidataValue.forString(value.getString());
}
@Override
public WikidataValue visit(TimeValue value) {
Calendar c =
new GregorianCalendar(
((int) value.getYear()),
value.getMonth() - 1,
value.getDay(),
value.getHour(),
value.getMinute(),
value.getSecond());
return new WikidataValue(WikidataValue.Type.TIME, c.getTime(), jsonValue);
}
@Override
public WikidataValue visit(MonolingualTextValue value) {
return WikidataValue.forString(value.getText());
}
@Override
public WikidataValue visit(DatatypeIdValue value) {
throw new IllegalArgumentException();
}
});
return val;
}