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New UniversalResourceSingleProvider to support more RDF formats #9
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| package org.eclipse.lyo.oslc4j.provider.jena; | ||
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| import java.io.InputStream; | ||
| import java.io.OutputStream; | ||
| import javax.ws.rs.WebApplicationException; | ||
| import javax.ws.rs.core.MediaType; | ||
| import javax.ws.rs.core.MultivaluedMap; | ||
| import org.apache.jena.rdf.model.Model; | ||
| import org.apache.jena.rdf.model.ModelFactory; | ||
| import org.apache.jena.rdf.model.RDFReader; | ||
| import org.apache.jena.rdf.model.RDFWriter; | ||
| import org.apache.jena.riot.Lang; | ||
| import org.apache.jena.riot.RDFDataMgr; | ||
| import org.apache.jena.riot.RDFFormat; | ||
| import org.apache.jena.riot.RDFLanguages; | ||
| import org.apache.jena.util.FileUtils; | ||
| import org.eclipse.lyo.oslc4j.core.exception.MessageExtractor; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| /** | ||
| * Created on 2018-05-27 | ||
| * | ||
| * @author Andrew Berezovskyi ([email protected]) | ||
| * @version $version-stub$ | ||
| * @since 0.0.1 | ||
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| */ | ||
| public class AbstractRdfProvider { | ||
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| private final static Logger log = LoggerFactory.getLogger(AbstractRdfProvider.class); | ||
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| protected void writeTo(final boolean queryResult, final Object[] objects, | ||
| final MediaType baseMediaType, final MultivaluedMap<String, Object> map, | ||
| final OutputStream outputStream) throws WebApplicationException { | ||
| String descriptionURI = null; | ||
| String responseInfoURI = null; | ||
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| if (queryResult) { | ||
| throw new IllegalArgumentException("Query Result resources have to be constructed " | ||
| + "before marshalling"); | ||
| } | ||
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| writeNonQueryObjectsTo(objects, outputStream, baseMediaType); | ||
| } | ||
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| protected void writeNonQueryObjectsTo(final Object[] objects, final OutputStream outputStream, | ||
| final MediaType serializationLanguage) { | ||
| try { | ||
| final Model model = JenaModelHelper.createJenaModel(objects); | ||
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| RDFWriter writer = getRdfWriter(serializationLanguage.toString(), model); | ||
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| if (serializationLanguage.equals(FileUtils.langXML) || serializationLanguage.equals( | ||
| FileUtils.langXMLAbbrev)) { | ||
| // XML (and Jena) default to UTF-8, but many libs default to ASCII, so need | ||
| // to set this explicitly | ||
| writer.setProperty("showXmlDeclaration", "false"); | ||
| String xmlDeclaration = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"; | ||
| outputStream.write(xmlDeclaration.getBytes()); | ||
| } | ||
| writer.write(model, outputStream, null); | ||
| } catch (final Exception exception) { | ||
| log.warn(MessageExtractor.getMessage("ErrorSerializingResource"), exception); | ||
| // TODO Andrew@2018-03-03: use another exception | ||
| throw new WebApplicationException(exception); | ||
| } | ||
| } | ||
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| private RDFWriter getRdfWriter(final String serializationLanguage, final Model model) { | ||
| RDFWriter writer = null; | ||
| if (serializationLanguage.equals(FileUtils.langXMLAbbrev)) { | ||
| // TODO Andrew@2018-05-27: do this for the RDF/XML-ABBREV only iff the users want it | ||
| /* Personally, I don't like the idea of maintaining a separate ABBREV writer. I think | ||
| we need to start introducing some flags where users can disable legacy functionality | ||
| altogether and rely on Jena etc.*/ | ||
| writer = new RdfXmlAbbreviatedWriter(); | ||
| } else { | ||
| final Lang lang = RDFLanguages.nameToLang(serializationLanguage); | ||
| // RDFDataMgr.createGraphWriter(mapLang(lang)); | ||
| // final Graph graph = model.getGraph(); | ||
| writer = model.getWriter(lang.getName()); | ||
| // FIXME Andrew@2018-05-27: what's the purpose of name>lang>name conversion? | ||
| } | ||
| return writer; | ||
| } | ||
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| private RDFFormat mapLang(final Lang lang) { | ||
| // TODO Andrew@2018-05-27: allow configuration from users (compact vs pretty etc) | ||
| final RDFFormat rdfFormat = new RDFFormat(lang); | ||
| return rdfFormat; | ||
| } | ||
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| /*=== READER ================================*/ | ||
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| protected Object[] readFrom(final Class<?> type, final MediaType mediaType, final InputStream | ||
| inputStream) | ||
| throws WebApplicationException { | ||
| final Model model = ModelFactory.createDefaultModel(); | ||
| RDFDataMgr.read( | ||
| model, | ||
| inputStream, | ||
| RDFDataMgr.determineLang(null, mediaType.toString(), null)); | ||
| try { | ||
| return JenaModelHelper.fromJenaModel(model, type); | ||
| } catch (final Exception exception) { | ||
| // FIXME Andrew@2018-05-27: we shall just stop the JMH blanket of exceptions craziness | ||
| throw new RuntimeException(exception); | ||
| // throw new WebApplicationException(exception, buildBadRequestResponse(exception, | ||
| // mediaType, | ||
| // map)); | ||
| } | ||
| } | ||
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| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| package org.eclipse.lyo.oslc4j.provider.jena; | ||
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.OutputStream; | ||
| import java.lang.annotation.Annotation; | ||
| import java.lang.reflect.Type; | ||
| import javax.ws.rs.Consumes; | ||
| import javax.ws.rs.Produces; | ||
| import javax.ws.rs.WebApplicationException; | ||
| import javax.ws.rs.core.MediaType; | ||
| import javax.ws.rs.core.MultivaluedMap; | ||
| import javax.ws.rs.ext.MessageBodyReader; | ||
| import javax.ws.rs.ext.MessageBodyWriter; | ||
| import javax.ws.rs.ext.Provider; | ||
| import org.eclipse.lyo.oslc4j.core.model.IResource; | ||
| import org.eclipse.lyo.oslc4j.core.model.OslcMediaType; | ||
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| /** | ||
| * JMH accepts objects in general but there is a slight conflict in the JAX pipeline with the | ||
| * Collections and Arrays, which are technically also Objects. If someone needs raw Objects, they | ||
| * can use old Providers. | ||
| * | ||
| * @author Andrew Berezovskyi ([email protected]) | ||
| * @version $version-stub$ | ||
| * @since 0.0.1 | ||
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| */ | ||
| @Provider | ||
| @Produces({OslcMediaType.APPLICATION_JSON_LD, OslcMediaType.TEXT_TURTLE, OslcMediaType | ||
| .N_TRIPLES_MIME, OslcMediaType.RDF_JSON_MIME, OslcMediaType.RDF_THRIFT_MIME}) | ||
| @Consumes({OslcMediaType.APPLICATION_JSON_LD, OslcMediaType.TEXT_TURTLE, OslcMediaType | ||
| .N_TRIPLES_MIME, OslcMediaType.RDF_JSON_MIME, OslcMediaType.RDF_THRIFT_MIME}) | ||
| public class UniversalResourceSingleProvider extends AbstractRdfProvider implements | ||
| MessageBodyReader<IResource>, MessageBodyWriter<IResource> | ||
| { | ||
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| private final int CANNOT_BE_DETERMINED_IN_ADVANCE = -1; | ||
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| @Override | ||
| public boolean isReadable(final Class<?> type, final Type genericType, | ||
| final Annotation[] annotations, final MediaType mediaType) { | ||
| // TODO Andrew@2018-05-27: test it | ||
| return true; | ||
| } | ||
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| @Override | ||
| public IResource readFrom(final Class<IResource> type, final Type genericType, | ||
| final Annotation[] annotations, final MediaType mediaType, | ||
| final MultivaluedMap<String, String> httpHeaders, final InputStream entityStream) | ||
| throws IOException, WebApplicationException { | ||
| final Object[] objects = readFrom(type, mediaType, entityStream); | ||
| if(objects.length > 1) { | ||
| throw new IllegalArgumentException("Can't unmarshal a single resource from a model " | ||
| + "with multiple matching resources"); | ||
| } | ||
| final IResource resource = (IResource) objects[0]; | ||
| return resource; | ||
| } | ||
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| @Override | ||
| public boolean isWriteable(final Class<?> type, final Type genericType, | ||
| final Annotation[] annotations, final MediaType mediaType) { | ||
| // TODO Andrew@2018-05-27: test | ||
| return true; | ||
| } | ||
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| @Override | ||
| public long getSize(final IResource iResource, final Class<?> type, final Type genericType, | ||
| final Annotation[] annotations, final MediaType mediaType) { | ||
| return CANNOT_BE_DETERMINED_IN_ADVANCE; | ||
| } | ||
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| @Override | ||
| public void writeTo(final IResource iResource, final Class<?> type, final Type genericType, | ||
| final Annotation[] annotations, final MediaType mediaType, | ||
| final MultivaluedMap<String, Object> httpHeaders, final OutputStream entityStream) | ||
| throws IOException, WebApplicationException { | ||
| writeNonQueryObjectsTo(new Object[] {iResource}, entityStream, mediaType); | ||
| } | ||
| } | ||
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why?