Examples with ReferenceTermContext eu.europeana.enrichment.api.internal.ReferenceTermContext used on opensource projects

Example 1 with ReferenceTermContext

use of eu.europeana.enrichment.api.internal.ReferenceTermContext in project metis-framework by europeana.

the class MetisRecordParser method parseReferences.

@Override
public Set<ReferenceTermContext> parseReferences(RDF rdf) {
    // Get all direct references (also look in Europeana proxy as it may have been dereferenced - we
    // use this below to follow sameAs links).
    final List<ProxyType> proxies = Optional.ofNullable(rdf.getProxyList()).stream().flatMap(Collection::stream).filter(Objects::nonNull).collect(Collectors.toList());
    final Map<String, Set<ProxyFieldType>> directReferences = new HashMap<>();
    for (ProxyFieldType field : ProxyFieldType.values()) {
        final Set<String> directLinks = proxies.stream().map(field::extractFieldLinksForEnrichment).flatMap(Set::stream).collect(Collectors.toSet());
        for (String directLink : directLinks) {
            directReferences.computeIfAbsent(directLink, key -> new HashSet<>()).add(field);
        }
    }
    // Get all sameAs links from the directly referenced contextual entities.
    final Map<String, Set<ProxyFieldType>> indirectReferences = new HashMap<>();
    final Consumer<AboutType> contextualTypeProcessor = contextualClass -> {
        final Set<ProxyFieldType> linkTypes = Optional.ofNullable(directReferences.get(contextualClass.getAbout())).orElseGet(Collections::emptySet);
        if (!linkTypes.isEmpty()) {
            for (String sameAsLink : getSameAsLinks(contextualClass)) {
                indirectReferences.computeIfAbsent(sameAsLink, key -> new HashSet<>()).addAll(linkTypes);
            }
        }
    };
    Optional.ofNullable(rdf.getAgentList()).orElseGet(Collections::emptyList).forEach(contextualTypeProcessor);
    Optional.ofNullable(rdf.getConceptList()).orElseGet(Collections::emptyList).forEach(contextualTypeProcessor);
    Optional.ofNullable(rdf.getPlaceList()).orElseGet(Collections::emptyList).forEach(contextualTypeProcessor);
    Optional.ofNullable(rdf.getTimeSpanList()).orElseGet(Collections::emptyList).forEach(contextualTypeProcessor);
    // Merge the two maps.
    final Map<String, Set<ProxyFieldType>> resultMap = mergeMapInto(directReferences, indirectReferences);
    // Clean up the result: no null values. But objects we already have need to
    // stay: maybe they are matched using a sameAs link.
    resultMap.remove(null);
    // Convert and done
    final Set<ReferenceTermContext> result = new HashSet<>();
    for (Map.Entry<String, Set<ProxyFieldType>> entry : resultMap.entrySet()) {
        ReferenceTermContext value;
        try {
            value = new ReferenceTermContext(new URL(entry.getKey()), entry.getValue());
            result.add(value);
        } catch (MalformedURLException e) {
            LOGGER.debug("Invalid enrichment reference found: {}", entry.getKey());
        }
    }
    return result;
}