Examples of org.apache.stanbol.entityhub.ldpath.EntityhubLDPath

Package org.apache.stanbol.entityhub.ldpath

Examples of org.apache.stanbol.entityhub.ldpath.EntityhubLDPath

org.apache.stanbol.entityhub.ldpath.EntityhubLDPath
{@link LDPath} with Entityhub specific configurations.In detail this registers {@link NodeTransformer} for:
- {@link DataTypeEnum#Reference} returning {@link Reference} instances
- xsd:anyURI also returning {@link Reference} instances
- {@link DataTypeEnum#Text} returning {@link Text} instances
- xsd:string also returning {@link Text} instances
It adds also support for returning {@link Representation} instances asresult of executing {@link Program}s on a context. This is important because it allows a seamless integration of LDPath with existing Entityhub functionality/interfaces
Because there is currently no way to get the LDPath parser to instantiate an extension of {@link Program}this feature is currently implemented by {@link #execute(Reference,Program)}of this class. @author Rupert Westenthaler

     */
    private Response executeLDPathQuery(Entityhub entityhub,FieldQuery query, String ldpathProgramString, MediaType mediaType, HttpHeaders headers) {
        QueryResultList<Representation> result;
        ValueFactory vf = new RdfValueFactory(new IndexedMGraph());
        EntityhubBackend backend = new EntityhubBackend(entityhub);
        EntityhubLDPath ldPath = new EntityhubLDPath(backend,vf);
        //copy the selected fields, because we might need to delete some during
        //the preparation phase
        Set<String> selectedFields = new HashSet<String>(query.getSelectedFields());
        //first prepare (only execute the query if the parameters are valid)
        Program<Object> program;

View Full Code Here

    private static MGraph executeLDPath(RDFBackend<Object> backend,
                                 String ldpath,
                                 Set<String> contexts ) throws LDPathParseException {
        MGraph data = new IndexedMGraph();
        RdfValueFactory vf = new RdfValueFactory(data);
        EntityhubLDPath ldPath = new EntityhubLDPath(backend,vf);
        Program<Object> program = ldPath.parseProgram(getReader(ldpath));
        if(log.isDebugEnabled()){
            log.debug("Execute on Context(s) '{}' LDPath program: \n{}",
                contexts,program.getPathExpression(backend));
        }
        /*
         * NOTE: We do not need to process the Representations returned by
         * EntityhubLDPath#exdecute, because the RdfValueFactory used uses
         * the local variable "MGraph data" to backup all created
         * RdfRepresentation. Because of this all converted data will be
         * automatically added the MGraph. The only thing we need to do is to
         * wrap the MGraph in the response.
         */
        for(String context : contexts){
            ldPath.execute(vf.createReference(context), program);
        }
        return data;
    }

View Full Code Here

        //this is OK, because parsing ldpath programs anyway does only need
        //the "value factory" role of the RDFBackend and does not actually
        //access any data.
        Yard yard = indexingConfig.getIndexingDestination().getYard();
        YardBackend backend = new YardBackend(yard);
        this.ldPath = new EntityhubLDPath(backend,yard.getValueFactory());
    }

View Full Code Here

     */
    private Response executeLDPathQuery(ReferencedSiteManager manager,FieldQuery query, String ldpathProgramString, MediaType mediaType, HttpHeaders headers) {
        QueryResultList<Representation> result;
        ValueFactory vf = new RdfValueFactory(new IndexedMGraph());
        SiteManagerBackend backend = new SiteManagerBackend(manager);
        EntityhubLDPath ldPath = new EntityhubLDPath(backend,vf);
        //copy the selected fields, because we might need to delete some during
        //the preparation phase
        Set<String> selectedFields = new HashSet<String>(query.getSelectedFields());
        //first prepare (only execute the query if the parameters are valid)
        Program<Object> program;

View Full Code Here

    protected IndexingConfig indexingConfig;
    
    public LdpathProcessor(){
        vf = InMemoryValueFactory.getInstance();
        this.backend = new SingleRepresentationBackend(vf);
        this.ldPath = new EntityhubLDPath(backend);
    }

View Full Code Here

    @Override
    public Program<Object> getParsedProgramByName(String programName) {
        SiteManagerBackend backend = new SiteManagerBackend(referencedSiteManager);
        String ldPathProgram = getProgramByName(programName);
        ValueFactory vf = InMemoryValueFactory.getInstance();
        EntityhubLDPath ldPath = new EntityhubLDPath(backend, vf);
      Program<Object> program = null;
        try {
            program = ldPath.parseProgram(LDPathUtils.constructReader(ldPathProgram));
        } catch (LDPathParseException e) {
          String msg = "Should never happen!!!!! Cannot parse the already stored LDPath program.";
            logger.error(msg, e);
        } catch (LDPathException e) {
          String msg = "Should never happen!!!!! Cannot parse the already stored LDPath program.";

View Full Code Here

    public Map<String,Collection<?>> executeProgram(String programName, Set<String> contexts) throws LDPathException {
        Map<String,Collection<?>> results = new HashMap<String,Collection<?>>();
        SiteManagerBackend backend = new SiteManagerBackend(referencedSiteManager);
        String ldPathProgram = getProgramByName(programName);
        ValueFactory vf = InMemoryValueFactory.getInstance();
        EntityhubLDPath ldPath = new EntityhubLDPath(backend, vf);
        Program<Object> program = null;
        try {
            program = ldPath.parseProgram(LDPathUtils.constructReader(ldPathProgram));
        } catch (LDPathParseException e) {
            logger.error("Should never happen!!!!!", e);
            return Collections.emptyMap();
        }


        Representation representation;
        for (String context : contexts) {
            representation = ldPath.execute(vf.createReference(context), program);
            Iterator<String> fieldNames = representation.getFieldNames();
            while (fieldNames.hasNext()) {
                String fieldName = fieldNames.next();
                Iterator<Object> valueIterator = representation.get(fieldName);
                Set<Object> values = new HashSet<Object>();

View Full Code Here

     */
    private Response executeLDPathQuery(FieldQuery query, String ldpathProgramString, MediaType mediaType, HttpHeaders headers) {
        QueryResultList<Representation> result;
        ValueFactory vf = new RdfValueFactory(new IndexedMGraph());
        SiteBackend backend = new SiteBackend(site,vf);
        EntityhubLDPath ldPath = new EntityhubLDPath(backend,vf);
        //copy the selected fields, because we might need to delete some during
        //the preparation phase
        Set<String> selectedFields = new HashSet<String>(query.getSelectedFields());
        //first prepare (only execute the query if the parameters are valid)
        Program<Object> program;

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