@Override
protected QueryNode postProcessNode(final QueryNode node) throws QueryNodeException {
// we have processed the DatatypeQueryNode, we can remove it now
if (node instanceof DatatypeQueryNode) {
final DatatypeQueryNode dt = (DatatypeQueryNode) node;
// return its child
return dt.getChild();
}
return node;
}
@Override
protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
final QueryConfigHandler conf = this.getQueryConfigHandler();
// If the current node is a datatype query node, validate the datatype and assign it to its
// child
if (node instanceof DatatypeQueryNode) {
final Map<String, Analyzer> dtAnalyzers =
conf.get(KeywordConfigurationKeys.DATATYPES_ANALYZERS);
final DatatypeQueryNode dt = (DatatypeQueryNode) node;
String datatype = dt.getDatatype();
// check if the datatype is correctly registered
if (dtAnalyzers == null) {
throw new IllegalArgumentException(
"KeywordConfigurationKeys.DATAYPES_ANALYZERS "
+ "should be set on the ExtendedKeywordQueryConfigHandler");
}
if (!dtAnalyzers.containsKey(datatype)) {
throw new IllegalArgumentException("Unknown datatype: [" + datatype + "]");
}
if (dtAnalyzers.get(datatype) == null) {
throw new IllegalArgumentException(
"Analyzer of datatype [" + datatype + "] cannot be null.");
}
// transfer the datatype to its child
dt.getChild().setTag(DatatypeQueryNode.DATATYPE_TAGID, datatype);
}
// If the current node is a twig query node, assign the json:field datatype to the root, and
// assign the default
// or the tagged datatype to the child
else if (node instanceof TwigQueryNode) {
final TwigQueryNode twig = (TwigQueryNode) node;
if (twig.getTag(DatatypeQueryNode.DATATYPE_TAGID) == null) {
twig.getChild().setTag(DatatypeQueryNode.DATATYPE_TAGID, this.getDefaultDatatype(conf));
} else {
twig.getChild().setTag(DatatypeQueryNode.DATATYPE_TAGID, this.getDatatype(conf, node));
}
twig.getRoot().setTag(DatatypeQueryNode.DATATYPE_TAGID, JSONDatatype.JSON_FIELD);
}
// in any other cases, if the node is not a leaf node, transfer the datatype to its children
else if (!node.isLeaf()) {
for (final QueryNode child : node.getChildren()) {
child.setTag(DatatypeQueryNode.DATATYPE_TAGID, this.getDatatype(conf, node));
}
}
return node;
}