/**
* Helper. Adds to the target model a translation of the given RDF list with each element replaced
* according to the map.
*/
private Resource mapList(Model target, Resource list, Map<Resource, Resource> map) {
if (list.equals(RDF.nil)) {
return RDF.nil;
} else {
Resource head = (Resource) list.getRequiredProperty(RDF.first).getObject();
Resource rest = (Resource) list.getRequiredProperty(RDF.rest).getObject();
Resource mapElt = target.createResource();
Resource mapHead = map.get(head);
if (mapHead == null) mapHead = head;
mapElt.addProperty(RDF.first, mapHead);
mapElt.addProperty(RDF.rest, mapList(target, rest, map));
return mapElt;
}
}
@Override
public EntityDefinition open(Assembler a, Resource root, Mode mode) {
String prologue = "PREFIX : <" + NS + "> PREFIX list: <http://jena.apache.org/ARQ/list#> ";
Model model = root.getModel();
String qs1 =
StrUtils.strjoinNL(
prologue,
"SELECT * {",
" ?eMap :entityField ?entityField ;",
" :map ?map ;",
" :defaultField ?dftField .",
" OPTIONAL {",
" ?eMap :graphField ?graphField",
" }",
" OPTIONAL {",
" ?eMap :langField ?langField",
" }",
" OPTIONAL {",
" ?eMap :uidField ?uidField",
" }",
"}");
ParameterizedSparqlString pss = new ParameterizedSparqlString(qs1);
pss.setIri("eMap", root.getURI());
Query query1 = QueryFactory.create(pss.toString());
QueryExecution qexec1 = QueryExecutionFactory.create(query1, model);
ResultSet rs1 = qexec1.execSelect();
List<QuerySolution> results = ResultSetFormatter.toList(rs1);
if (results.size() == 0) {
Log.warn(this, "Failed to find a valid EntityMap for : " + root);
throw new TextIndexException("Failed to find a valid EntityMap for : " + root);
}
if (results.size() != 1) {
Log.warn(this, "Multiple matches for EntityMap for : " + root);
throw new TextIndexException("Multiple matches for EntityMap for : " + root);
}
QuerySolution qsol1 = results.get(0);
String entityField = qsol1.getLiteral("entityField").getLexicalForm();
String graphField =
qsol1.contains("graphField") ? qsol1.getLiteral("graphField").getLexicalForm() : null;
String langField =
qsol1.contains("langField") ? qsol1.getLiteral("langField").getLexicalForm() : null;
String defaultField =
qsol1.contains("dftField") ? qsol1.getLiteral("dftField").getLexicalForm() : null;
String uniqueIdField =
qsol1.contains("uidField") ? qsol1.getLiteral("uidField").getLexicalForm() : null;
Multimap<String, Node> mapDefs = HashMultimap.create();
Map<String, Analyzer> analyzerDefs = new HashMap<>();
Statement listStmt = root.getProperty(TextVocab.pMap);
while (listStmt != null) {
RDFNode n = listStmt.getObject();
if (!n.isResource()) {
throw new TextIndexException("Text list node is not a resource : " + n);
}
Resource listResource = n.asResource();
if (listResource.equals(RDF.nil)) {
break; // end of the list
}
Statement listEntryStmt = listResource.getProperty(RDF.first);
if (listEntryStmt == null) {
throw new TextIndexException("Text map list is not well formed. No rdf:first property");
}
n = listEntryStmt.getObject();
if (!n.isResource()) {
throw new TextIndexException("Text map list entry is not a resource : " + n);
}
Resource listEntry = n.asResource();
Statement fieldStatement = listEntry.getProperty(TextVocab.pField);
if (fieldStatement == null) {
throw new TextIndexException("Text map entry has no field property");
}
n = fieldStatement.getObject();
if (!n.isLiteral()) {
throw new TextIndexException("Text map entry field property has no literal value : " + n);
}
String field = n.asLiteral().getLexicalForm();
Statement predicateStatement = listEntry.getProperty(TextVocab.pPredicate);
if (predicateStatement == null) {
throw new TextIndexException("Text map entry has no predicate property");
}
n = predicateStatement.getObject();
if (!n.isURIResource()) {
throw new TextIndexException(
"Text map entry predicate property has non resource value : " + n);
}
mapDefs.put(field, n.asNode());
Statement analyzerStatement = listEntry.getProperty(TextVocab.pAnalyzer);
if (analyzerStatement != null) {
n = analyzerStatement.getObject();
if (!n.isResource()) {
throw new TextIndexException("Text map entry analyzer property is not a resource : " + n);
}
Resource analyzerResource = n.asResource();
Analyzer analyzer = (Analyzer) a.open(analyzerResource);
analyzerDefs.put(field, analyzer);
}
// move on to the next element in the list
listStmt = listResource.getProperty(RDF.rest);
}
// Primary field/predicate
if (defaultField != null) {
Collection<Node> c = mapDefs.get(defaultField);
if (c.isEmpty())
throw new TextIndexException("No definition of primary field '" + defaultField + "'");
}
EntityDefinition docDef = new EntityDefinition(entityField, defaultField);
docDef.setGraphField(graphField);
docDef.setLangField(langField);
docDef.setUidField(uniqueIdField);
for (String f : mapDefs.keys()) {
for (Node p : mapDefs.get(f)) docDef.set(f, p);
}
for (String f : analyzerDefs.keySet()) {
docDef.setAnalyzer(f, analyzerDefs.get(f));
}
return docDef;
}