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The Fedora Commons repository HTTP commons module: Provides HTTP (JAX-RS) resources and helpers for use in assembling HTTP APIs over the Fedora Commons repository framework.

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/*
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree.
 */
package org.fcrepo.http.commons.api.rdf;

import static java.util.Spliterator.IMMUTABLE;
import static java.util.Spliterators.spliteratorUnknownSize;
import static java.util.stream.Stream.concat;
import static java.util.stream.StreamSupport.stream;

import static org.slf4j.LoggerFactory.getLogger;

import java.util.Map;

import javax.ws.rs.core.UriInfo;

import org.apache.jena.rdf.model.Statement;

import org.fcrepo.kernel.api.models.FedoraResource;
import org.fcrepo.kernel.api.rdf.DefaultRdfStream;
import org.fcrepo.kernel.api.RdfStream;

import org.slf4j.Logger;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * Utility for injecting HTTP-contextual data into an RdfStream
 *
 * @author awoods
 */
@Component
public class HttpTripleUtil implements ApplicationContextAware {

    private static final Logger LOGGER = getLogger(HttpTripleUtil.class);

    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(final ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }

    /**
     * Add additional models to the RDF dataset for the given resource
     *
     * @param rdfStream the source stream we'll add named models to
     * @param resource the FedoraResourceImpl in question
     * @param uriInfo a JAX-RS UriInfo object to build URIs to resources
     * @return an RdfStream with the added triples
     */
    public RdfStream addHttpComponentModelsForResourceToStream(final RdfStream rdfStream,
            final FedoraResource resource, final UriInfo uriInfo) {

        LOGGER.debug("Adding additional HTTP context triples to stream");
        return new DefaultRdfStream(rdfStream.topic(), concat(rdfStream, getUriAwareTripleFactories().entrySet()
                    .stream().flatMap(e -> {
            LOGGER.debug("Adding response information using: {}", e.getKey());
            return stream(spliteratorUnknownSize(e.getValue().createModelForResource(resource, uriInfo)
                    .listStatements(), IMMUTABLE), false).map(Statement::asTriple);
        })));
    }

    private Map getUriAwareTripleFactories() {
        return applicationContext
                .getBeansOfType(UriAwareResourceModelFactory.class);
    }
}