JsonLDWriter.jsonLDJavaAPIObject to convert a Jena dataset to a JsonLD-java API object
Project: http://git-wip-us.apache.org/repos/asf/jena/repo Commit: http://git-wip-us.apache.org/repos/asf/jena/commit/872c2897 Tree: http://git-wip-us.apache.org/repos/asf/jena/tree/872c2897 Diff: http://git-wip-us.apache.org/repos/asf/jena/diff/872c2897 Branch: refs/heads/ThreadPerGraphDataset Commit: 872c2897af3e99e111719bb45ddde499d04d142b Parents: 2483639 Author: François-Paul Servant <[email protected]> Authored: Thu Jan 26 02:06:43 2017 +0100 Committer: François-Paul Servant <[email protected]> Committed: Thu Jan 26 02:06:43 2017 +0100 ---------------------------------------------------------------------- .../apache/jena/riot/writer/JsonLDWriter.java | 131 ++++++++++--------- 1 file changed, 70 insertions(+), 61 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/jena/blob/872c2897/jena-arq/src/main/java/org/apache/jena/riot/writer/JsonLDWriter.java ---------------------------------------------------------------------- diff --git a/jena-arq/src/main/java/org/apache/jena/riot/writer/JsonLDWriter.java b/jena-arq/src/main/java/org/apache/jena/riot/writer/JsonLDWriter.java index b320442..cf3c335 100644 --- a/jena-arq/src/main/java/org/apache/jena/riot/writer/JsonLDWriter.java +++ b/jena-arq/src/main/java/org/apache/jena/riot/writer/JsonLDWriter.java @@ -87,6 +87,9 @@ import com.github.jsonldjava.utils.JsonUtils ; * * The {@link org.apache.jena.riot.JsonLDWriteContext} is a convenience class that extends Context and * provides methods to set the values of these different Symbols that are used in controlling the writing of JSON-LD. + * + * Note that this class also provides a static method to convert jena RDF data to the corresponding object in JsonLD API: + * {@link #jsonLDJavaAPIObject(DatasetGraph, PrefixMap, String, org.apache.jena.riot.RDFFormat.JSONLDVariant, Context)} */ public class JsonLDWriter extends WriterDatasetRIOTBase { @@ -147,7 +150,7 @@ public class JsonLDWriter extends WriterDatasetRIOTBase return (RDFFormat.JSONLDVariant) format.getVariant(); } - private JsonLdOptions getJsonLdOptions(String baseURI, Context jenaContext) { + static private JsonLdOptions getJsonLdOptions(String baseURI, Context jenaContext) { JsonLdOptions opts = null; if (jenaContext != null) { opts = (JsonLdOptions) jenaContext.get(JSONLD_OPTIONS); @@ -172,66 +175,8 @@ public class JsonLDWriter extends WriterDatasetRIOTBase private void serialize(Writer writer, DatasetGraph dataset, PrefixMap prefixMap, String baseURI, Context jenaContext) { try { - 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); - @SuppressWarnings("deprecation") // JsonLdApi.fromRDF(RDFDataset, boolean) is "experimental" rather than "deprecated" - Object obj = (new JsonLdApi(opts)).fromRDF(jsonldDataset, true); // true because we know that we don't have any duplicate in jsonldDataset - - RDFFormat.JSONLDVariant variant = getVariant(); - 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())); - } - } - } - } - } - - if (variant.isPretty()) { + Object obj = jsonLDJavaAPIObject(dataset, prefixMap, baseURI, getVariant(), jenaContext); + if (getVariant().isPretty()) { JsonUtils.writePrettyPrint(writer, obj) ; } else { JsonUtils.write(writer, obj) ; @@ -244,6 +189,70 @@ public class JsonLDWriter extends WriterDatasetRIOTBase IO.exception(e) ; } } + + /** + * the JsonLD-java API object corresponding to a dataset and a JsonLD format. + */ + static public Object jsonLDJavaAPIObject(DatasetGraph dataset, PrefixMap prefixMap, String baseURI, RDFFormat.JSONLDVariant variant, 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); + @SuppressWarnings("deprecation") // JsonLdApi.fromRDF(RDFDataset, boolean) is "experimental" rather than "deprecated" + Object obj = (new JsonLdApi(opts)).fromRDF(jsonldDataset, true); // true because we know that we don't have any duplicate in jsonldDataset + + 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; + } // // getting / creating a (jsonld) context
