Examples with JsonLdApi com.github.jsonldjava.core.JsonLdApi used on opensource projects

Example 1 with JsonLdApi

use of com.github.jsonldjava.core.JsonLdApi in project jena by apache.

the class JsonLDWriter method toJsonLDJavaAPI.

/**
     * the JsonLD-java API object corresponding to a dataset and a JsonLD format.
     */
public static Object toJsonLDJavaAPI(RDFFormat.JSONLDVariant variant, DatasetGraph dataset, PrefixMap prefixMap, String baseURI, Context jenaContext) throws JsonLdError, JsonParseException, IOException {
    JsonLdOptions opts = getJsonLdOptions(baseURI, jenaContext);
    // we can benefit from the fact we know that there are no duplicates in the jsonld RDFDataset that we create
    // (optimization in jsonld-java 0.8.3)
    // see https://github.com/jsonld-java/jsonld-java/pull/173
    // with this, we cannot call the json-ld fromRDF method that assumes no duplicates in RDFDataset
    // Object obj = JsonLdProcessor.fromRDF(dataset, opts, new JenaRDF2JSONLD()) ;
    final RDFDataset jsonldDataset = (new JenaRDF2JSONLD()).parse(dataset);
    // JsonLdApi.fromRDF(RDFDataset, boolean) is "experimental" rather than "deprecated"
    @SuppressWarnings("deprecation") Object // true because we know that we don't have any duplicate in jsonldDataset
    obj = (new JsonLdApi(opts)).fromRDF(jsonldDataset, true);
    if (variant.isExpand()) {
    // nothing more to do
    } else if (variant.isFrame()) {
        Object frame = null;
        if (jenaContext != null) {
            frame = jenaContext.get(JSONLD_FRAME);
        }
        if (frame == null) {
            throw new IllegalArgumentException("No frame object found in jena Context");
        }
        if (frame instanceof String) {
            frame = JsonUtils.fromString((String) frame);
        }
        obj = JsonLdProcessor.frame(obj, frame, opts);
    } else {
        // compact or flatten
        // we need a (jsonld) context. Get it from jenaContext, or create one:
        Object ctx = getJsonldContext(dataset, prefixMap, jenaContext);
        if (variant.isCompact()) {
            obj = JsonLdProcessor.compact(obj, ctx, opts);
        } else if (variant.isFlatten()) {
            obj = JsonLdProcessor.flatten(obj, ctx, opts);
        } else {
            throw new IllegalArgumentException("Unexpected " + RDFFormat.JSONLDVariant.class.getName() + ": " + variant);
        }
        // replace @context in output?
        if (jenaContext != null) {
            Object ctxReplacement = jenaContext.get(JSONLD_CONTEXT_SUBSTITUTION);
            if (ctxReplacement != null) {
                if (obj instanceof Map) {
                    @SuppressWarnings("unchecked") Map<String, Object> map = (Map<String, Object>) obj;
                    if (map.containsKey("@context")) {
                        map.put("@context", JsonUtils.fromString(ctxReplacement.toString()));
                    }
                }
            }
        }
    }
    return obj;
}