Examples of org.apache.stanbol.entityhub.servicesapi.Entityhub

Package org.apache.stanbol.entityhub.servicesapi

Examples of org.apache.stanbol.entityhub.servicesapi.Entityhub

org.apache.stanbol.entityhub.servicesapi.Entityhub

The Entityhub defines an interface that allows to manage Entities. Entities managed by the Entityhub are often referred by "locally managed Entities" to differentiate them form entities managed by {@link Site}s.
The Entityhub supports full CRUD support for Entities and also allows to import Entities from Referenced sites.
In addition to Entities the Entityhub also allows to work with mappings between Entities of {@link Site}s with locally managed Entities. @author Rupert Westenthaler

        } else {
            if (reference == null || reference.isEmpty()) {
                // TODO: how to parse an error message
                throw new WebApplicationException(BAD_REQUEST);
            }
            Entityhub entityhub = ContextHelper.getServiceFromContext(Entityhub.class, servletContext);
            Entity entity;
            try {
                entity = entityhub.lookupLocalEntity(reference, create);
            } catch (EntityhubException e) {
                throw new WebApplicationException(e, INTERNAL_SERVER_ERROR);
            }
            if (entity == null) {
                return Response.status(Status.NOT_FOUND).entity("No symbol found for '" + reference + "'.")

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        if(id == null || id.isEmpty()){
            return Response.status(Status.BAD_REQUEST).entity("The Request does" +
                    "not provide the id of the Entity to delete (parameter 'id').")
                    .header(HttpHeaders.ACCEPT, accepted).build();
        }
        Entityhub entityhub = ContextHelper.getServiceFromContext(Entityhub.class, servletContext);
        Entity entity;
        try {
            entity = entityhub.delete(id);
        } catch (EntityhubException e) {
            return Response.status(Status.INTERNAL_SERVER_ERROR).entity(e.getMessage())
            .header(HttpHeaders.ACCEPT, accepted).build();
        }
        if(entity == null){

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    private Response updateOrCreateEntity(String id,Set<Representation> parsed, 
                                          String method,
                                          boolean create, 
                                          boolean update,
                                          HttpHeaders headers){
        Entityhub entityhub = ContextHelper.getServiceFromContext(Entityhub.class, servletContext);
        MediaType accepted = getAcceptableMediaType(headers,
            JerseyUtils.ENTITY_SUPPORTED_MEDIA_TYPES, 
            MediaType.APPLICATION_JSON_TYPE);
        if(entityhub == null){
            return Response.status(Status.INTERNAL_SERVER_ERROR).
                entity("The Entityhub is currently unavailable.")
                .header(HttpHeaders.ACCEPT, accepted).build();
        }
        //(1) if an id is parsed we need to filter parsed Representations
        if(id != null){
            for(Iterator<Representation> it = parsed.iterator(); it.hasNext();){
                Representation rep = it.next();
                String aboutId = ModelUtils.getAboutRepresentation(rep);
                if(!(id.equals(rep.getId()) ||
                        id.equals(aboutId))){
                    it.remove(); //not the Entity nor the metadata of the parsed ID
                }
            }
        }
        //First check if all parsed Representation can be created/updated
        if(!(create && update)){ //if both create and update are enabled skip this
            for(Representation representation : parsed){
                boolean exists;
                try {
                    exists = entityhub.isRepresentation(representation.getId());
                } catch (EntityhubException e) {
                    log.error(String.format("Exception while checking the existance " +
                        "of an Entity with id  %s in the Entityhub.",
                        representation.getId()),e);
                    return Response.status(Status.INTERNAL_SERVER_ERROR)
                    .entity(String.format("Unable to process Entity %s because of" +
                            "an Error while checking the current version of that" +
                            "Entity within the Entityhub (Message: %s)",
                            representation.getId(),e.getMessage()))
                            .header(HttpHeaders.ACCEPT, accepted).build();
                }
                if((exists && !update) || (!exists && !create)){
                    return Response.status(Status.BAD_REQUEST).entity(String.format(
                        "Unable to %s an Entity %s becuase it %s and %s is deactivated. " +
                        " You might want to set the '%s' parameter to TRUE in your Request",
                        exists ? "update" : "create",
                        representation.getId(),
                        exists ? "does already exists " : "does not",
                        exists ? "updateing existing" : "creating new",
                        exists ? "does already" : "does not exists",
                        exists ? "update" : "create"))
                        .header(HttpHeaders.ACCEPT, accepted).build();
                }
            }
        }
        //store the Representations
        //If someone parses data for more than a single Entity, but does not
        //provide an ID for the Entity to update, this will update/create all
        //the parsed entity. However the response can only return a single
        //Entity!
        //This can not be changed easily as long as there are no local URIs 
        //for remote Entiteis as suggested by
        // http://incubator.apache.org/stanbol/docs/trunk/entityhub/entityhubandlinkeddata.html
        Map<String,Entity> updated = new HashMap<String,Entity>();
        for(Representation representation : parsed){
            try {
                Entity entity = entityhub.store(representation);
                updated.put(entity.getId(), entity);
            }catch (EntityhubException e) {
                log.error(String.format("Exception while storing Entity %s" +
                        "in the Entityhub.",representation),e);
            }

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     * @param query The query to execute
     * @param headers The headers used to determine the media types
     * @return the response (results of error)
     */
    private Response executeQuery(FieldQuery query, HttpHeaders headers, MediaType acceptedMediaType) throws WebApplicationException {
        Entityhub entityhub = ContextHelper.getServiceFromContext(Entityhub.class, servletContext);
        if(query instanceof LDPathSelect && ((LDPathSelect)query).getLDPathSelect() != null){
            //use the LDPath variant to process this query
            return executeLDPathQuery(entityhub,query, ((LDPathSelect)query).getLDPathSelect(),
                acceptedMediaType, headers);
        } else { //use the default query execution
            QueryResultList<Representation> result;
            try {
                result = entityhub.find(query);
            } catch (EntityhubException e) {
                String message = String.format("Exception while performing the " +
                    "FieldQuery on the EntityHub (message: %s)", e.getMessage());
                log.error(message, e);
                return Response.status(Status.INTERNAL_SERVER_ERROR)

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            } else {
                return Response.status(Status.BAD_REQUEST).entity("The mapping id (URI) is missing.\n").header(
                    HttpHeaders.ACCEPT, acceptedMediaType).build();
            }
        }
        Entityhub entityhub = ContextHelper.getServiceFromContext(Entityhub.class, servletContext);
        Entity mapping;
        try {
            mapping = entityhub.getMappingById(reference);
        } catch (EntityhubException e) {
            log.error("error while getting the mapping for {}", reference, e);
            return Response.status(Status.INTERNAL_SERVER_ERROR).build();
        }
        if (mapping == null) {

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                return Response.status(Status.BAD_REQUEST).entity("No entity given. Missing parameter id.\n")
                    .header(HttpHeaders.ACCEPT, acceptedMediaType).build();
            }
        }
        
        Entityhub entityhub = ContextHelper.getServiceFromContext(Entityhub.class, servletContext);
        Entity mapping;
        try {
            mapping = entityhub.getMappingBySource(entity);
        } catch (EntityhubException e) {
            throw new WebApplicationException(e, INTERNAL_SERVER_ERROR);
        }
        if (mapping == null) {
            return Response.status(Status.NOT_FOUND).entity("No mapping found for entity '" + entity + "'.\n")

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            } else {
                return Response.status(Status.BAD_REQUEST).entity("No symbol given. Missing parameter id.\n")
                    .header(HttpHeaders.ACCEPT, acceptedMediaType).build();
            }
        }
        Entityhub entityhub = ContextHelper.getServiceFromContext(Entityhub.class, servletContext);
        Collection<Entity> mappings;
        try {
            mappings = entityhub.getMappingsByTarget(symbol);
        } catch (EntityhubException e) {
            throw new WebApplicationException(e, INTERNAL_SERVER_ERROR);
        }
        if (mappings == null || mappings.isEmpty()) {
            return Response.status(Status.NOT_FOUND).entity("No mapping found for symbol '" + symbol + "'.\n")

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    @Path("/ldpath")
    public Response handleLDPathPost(
             @FormParam(value = "context")Set<String> contexts,
             @FormParam(value = "ldpath")String ldpath,
             @Context HttpHeaders headers){
        Entityhub entityhub = ContextHelper.getServiceFromContext(Entityhub.class, servletContext);
        return handleLDPathRequest(this,new YardBackend(entityhub.getYard()), 
            ldpath, contexts, headers, servletContext);
    }

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    @Override
    public Representation get(String id,Set<String> includeFields) {
        if(id == null || id.isEmpty()){
            return null;
        }
        Entityhub entityhub = getSearchService();
        if(entityhub == null){
            throw new IllegalStateException("The Entityhub is currently not active");
        }
        Entity entity;
        try {
            entity = entityhub.getEntity(id);
        }  catch (EntityhubException e) {
            throw new IllegalStateException("Exception while getting "+id+
                " from the Entityhub",e);
        }
        return entity == null ? null : entity.getRepresentation();

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    @Override
    public Collection<? extends Representation> lookup(String field,
                                           Set<String> includeFields,
                                           List<String> search,
                                           String... languages) throws IllegalStateException {
        Entityhub entityhub = getSearchService();
        if(entityhub == null){
            throw new IllegalStateException("The Entityhub is currently not active");
        }
        FieldQuery query = EntitySearcherUtils.createFieldQuery(entityhub.getQueryFactory(),
            field, includeFields, search, languages);
        QueryResultList<Representation> results;
        try {
            results = entityhub.find(query);
        } catch (EntityhubException e) {
            throw new IllegalStateException("Exception while searchign for "+
                search+'@'+Arrays.toString(languages)+"in the Entityhub", e);
        }
        return results.results();

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Related Classes of org.apache.stanbol.entityhub.servicesapi.Entityhub

org.apache.stanbol.enhancer.engines.entityhublinking.EntityhubSearcher

org.apache.stanbol.enhancer.engines.keywordextraction.linking.impl.EntityhubSearcher

org.apache.stanbol.entityhub.jersey.resource.EntityhubRootResource

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