/**
* This method returns an HTTP response with content body appropriate to the following arguments.
*
* @param rangeValue starting and ending byte offsets, see {@link Range}
* @param limit is the number of child resources returned in the response, -1 for all
* @param rdfStream to which response RDF will be concatenated
* @return HTTP response
* @throws IOException
*/
protected Response getContent(final String rangeValue, final int limit, final RdfStream rdfStream)
throws IOException {
if (resource() instanceof FedoraBinary) {
final String contentTypeString = ((FedoraBinary) resource()).getMimeType();
final Lang lang = contentTypeToLang(contentTypeString);
if (!contentTypeString.equals("text/plain") && lang != null) {
final String format = lang.getName().toUpperCase();
final InputStream content = ((FedoraBinary) resource()).getContent();
final Model inputModel =
createDefaultModel().read(content, (resource()).toString(), format);
rdfStream.concat(Iterators.transform(inputModel.listStatements(), Statement::asTriple));
} else {
final MediaType mediaType = MediaType.valueOf(contentTypeString);
if (MESSAGE_EXTERNAL_BODY.isCompatible(mediaType)
&& mediaType.getParameters().containsKey("access-type")
&& mediaType.getParameters().get("access-type").equals("URL")
&& mediaType.getParameters().containsKey("URL")) {
try {
return temporaryRedirect(new URI(mediaType.getParameters().get("URL"))).build();
} catch (final URISyntaxException e) {
throw new RepositoryRuntimeException(e);
}
}
return getBinaryContent(rangeValue);
}
} else {
rdfStream.concat(getResourceTriples(limit));
if (prefer != null) {
prefer.getReturn().addResponseHeaders(servletResponse);
}
}
servletResponse.addHeader("Vary", "Accept, Range, Accept-Encoding, Accept-Language");
return ok(rdfStream).build();
}
/**
* 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;
}