private Optional<Value> processGDMObject(final Node object) {
final NodeType objectType = object.getType();
switch (objectType) {
case Literal:
final LiteralNode literalNode = (LiteralNode) object;
final String value = literalNode.getValue();
final String finalValue;
if (!value.trim().isEmpty()) {
// note: we need to trim the values; otherwise, we'll get a
// 'wikibase-validator-malformed-value' error
final String trimmedValue = value.trim();
// note: we need to cut the values, if they are longer then 400 characters; otherwise,
// we'll get a 'wikibase-validator-too-long' error
finalValue = cutLongValue(trimmedValue);
} else {
// empty values are not possible in Wikidata - insert placeholder for now
// finalValue = VALUE_WAS_EMPTY_ORIGINALLY;
return Optional.empty();
}
return Optional.ofNullable(Datamodel.makeStringValue(finalValue));
case Resource:
// create ItemIdValue, i.e., create a Wikidata Item just with the Id as label
final ResourceNode resourceNode = (ResourceNode) object;
return Optional.ofNullable(processGDMResourceNode(resourceNode));
default:
// TODO throw an exception or just skip and log (i.e. these should be bnodes)
}
return Optional.empty();
}
private static String printGDMNode(final Node node) {
final StringBuilder sb = new StringBuilder();
final Long id = node.getId();
sb.append("id = '");
if (id != null) {
sb.append(id);
} else {
sb.append("no node id available");
}
final NodeType nodeType = node.getType();
switch (nodeType) {
case Literal:
sb.append("' :: ");
final LiteralNode literalNode = (LiteralNode) node;
final String value = literalNode.getValue();
sb.append("value = '").append(value);
break;
case Resource:
sb.append("' :: ");
final ResourceNode resourceNode = (ResourceNode) node;
final String resourceURI = resourceNode.getUri();
sb.append("uri = '").append(resourceURI);
break;
}
sb.append("' :: type = '").append(nodeType).append("'}");
return sb.toString();
}