/**
* This method returns a stream of RDF triples associated with this target resource
*
* @param limit is the number of child resources returned in the response, -1 for all
* @return {@link RdfStream}
*/
protected RdfStream getResourceTriples(final int limit) {
// use the thing described, not the description, for the subject of descriptive triples
if (resource() instanceof NonRdfSourceDescription) {
resource = ((NonRdfSourceDescription) resource()).getDescribedResource();
}
final PreferTag returnPreference;
if (prefer != null && prefer.hasReturn()) {
returnPreference = prefer.getReturn();
} else if (prefer != null && prefer.hasHandling()) {
returnPreference = prefer.getHandling();
} else {
returnPreference = PreferTag.emptyTag();
}
final LdpPreferTag ldpPreferences = new LdpPreferTag(returnPreference);
final RdfStream rdfStream = new RdfStream();
final Predicate<Triple> tripleFilter =
ldpPreferences.prefersServerManaged() ? x -> true : IS_MANAGED_TRIPLE.negate();
if (ldpPreferences.prefersServerManaged()) {
rdfStream.concat(getTriples(LdpRdfContext.class));
}
rdfStream.concat(filter(getTriples(TypeRdfContext.class), tripleFilter::test));
rdfStream.concat(filter(getTriples(PropertiesRdfContext.class), tripleFilter::test));
if (!returnPreference.getValue().equals("minimal")) {
// Additional server-managed triples about this resource
if (ldpPreferences.prefersServerManaged()) {
rdfStream.concat(getTriples(AclRdfContext.class));
rdfStream.concat(getTriples(RootRdfContext.class));
rdfStream.concat(getTriples(ContentRdfContext.class));
rdfStream.concat(getTriples(ParentRdfContext.class));
}
// containment triples about this resource
if (ldpPreferences.prefersContainment()) {
rdfStream.concat(getTriples(ChildrenRdfContext.class).limit(limit));
}
// LDP container membership triples for this resource
if (ldpPreferences.prefersMembership()) {
rdfStream.concat(getTriples(LdpContainerRdfContext.class));
rdfStream.concat(getTriples(LdpIsMemberOfRdfContext.class));
}
// Embed all hash and blank nodes
// using IS_MANAGED_TRIPLE directly to avoid Prefer header logic (we never want them for hash
// fragments)
rdfStream.concat(filter(getTriples(HashRdfContext.class), IS_MANAGED_TRIPLE.negate()::test));
rdfStream.concat(filter(getTriples(SkolemNodeRdfContext.class), tripleFilter::test));
// Include inbound references to this object
if (ldpPreferences.prefersReferences()) {
rdfStream.concat(getTriples(ReferencesRdfContext.class));
}
// Embed the children of this object
if (ldpPreferences.prefersEmbed()) {
final Iterator<FedoraResource> children = resource().getChildren();
rdfStream.concat(
filter(
concat(
transform(
children,
child ->
child.getTriples(
translator(),
ImmutableList.of(
TypeRdfContext.class,
PropertiesRdfContext.class,
SkolemNodeRdfContext.class)))),
tripleFilter::test));
}
}
if (httpTripleUtil != null && ldpPreferences.prefersServerManaged()) {
httpTripleUtil.addHttpComponentModelsForResourceToStream(
rdfStream, resource(), uriInfo, translator());
}
return rdfStream;
}
