Examples of org.apache.stanbol.entityhub.servicesapi.query.FieldQuery

Package org.apache.stanbol.entityhub.servicesapi.query

Examples of org.apache.stanbol.entityhub.servicesapi.query.FieldQuery

org.apache.stanbol.entityhub.servicesapi.query.FieldQuery
Simple query interface that allows to search for representations based on fields and there values.
Currently it is only possible to set a single constraint per field. Therefore it is not possible to combine an range constraint with an language constraint. e.g. searching for all labels form a-f in a list of given languages. TODO: This shortcoming needs to be reevaluated. The intension was to ease the implementation and the usage of this interface. TODO: Implementation need to be able to throw UnsupportedConstraintExceptions for specific combinations of Constraints e.g. Regex or case insensitive ... TODO: Would be nice if an Implementation could also announce the list of supported constraints (e.g. via Capability levels ...) @author Rupert Westenthaler

                entity.getRepresentation().getId(),
                entity.getMetadata().getId()));
        }
    }
    private void deleteEntities(Yard yard, Collection<String> ids) throws YardException {
        FieldQuery fieldQuery = getQueryFactory().createFieldQuery();
        Collection<String> toDelete = new HashSet<String>(ids);
        for(String id : ids){
            if(id != null && !id.isEmpty()){
                fieldQuery.setConstraint(RdfResourceEnum.aboutRepresentation.getUri(), new ReferenceConstraint(id));
                for(Iterator<String> it = yard.findReferences(fieldQuery).iterator();it.hasNext();){
                    toDelete.add(it.next());
                }
            }
        }

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    }


    private void deleteMappingsbyTarget(Yard yard,String id) throws YardException {
        if(id != null && !id.isEmpty()){
            FieldQuery fieldQuery = getQueryFactory().createFieldQuery();
            fieldQuery.setConstraint(RdfResourceEnum.mappingTarget.getUri(), new ReferenceConstraint(id));
            deleteEntities(yard, ModelUtils.asCollection(
                yard.findReferences(fieldQuery).iterator()));
        }
    }

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    public Entity getMappingBySource(String reference) throws YardException{
        if(reference == null){
            log.warn("NULL parsed as Reference -> call to getMappingByEntity ignored (return null)");
            return null;
        }
        FieldQuery fieldQuery = getQueryFactory().createFieldQuery();
        fieldQuery.setConstraint(RdfResourceEnum.mappingSource.getUri(), new ReferenceConstraint(reference));
        Yard entityhubYard = lookupYard();
        QueryResultList<Representation> resultList = entityhubYard.findRepresentation(fieldQuery);
        if(!resultList.isEmpty()){
            Iterator<Representation> resultIterator = resultList.iterator();
            Entity mapping = loadEntity(entityhubYard, resultIterator.next());

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    public Collection<Entity> getMappingsByTarget(String targetId) throws YardException{
        if(targetId == null){
            log.warn("NULL parsed as Reference -> call to getMappingsBySymbol ignored (return null)");
            return null;
        }
        FieldQuery fieldQuery = getQueryFactory().createFieldQuery();
        fieldQuery.setConstraint(RdfResourceEnum.mappingTarget.getUri(), new ReferenceConstraint(targetId));
        Yard enttiyhubYard = lookupYard();
        QueryResultList<Representation> resultList = enttiyhubYard.findRepresentation(fieldQuery);
        Collection<Entity> mappings = new HashSet<Entity>();
        for(Representation rep : resultList){
            mappings.add(loadEntity(enttiyhubYard, rep));

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        }
        return container;
    }


    private JSONObject reconcile(ReconcileQuery rQuery) throws JSONException, EntityhubException {
        FieldQuery query = createFieldQuery();
        query.addSelectedFields(SELECTED_FIELDS);
        addNameConstraint(rQuery, query);
        addTypeConstraint(rQuery, query);
        addPropertyConstraints(rQuery, query);
        query.setLimit(query.getLimit());
        QueryResultList<Representation> results = performQuery(query);
        List<JSONObject> jResultList = new ArrayList<JSONObject>(results.size());
        //we need to know the highest score to normalise between [0..1]
        double maxQueryScore = -1;
        if(!results.isEmpty()){

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        }
        pattern = pattern.trim();
        pattern += "*";


        FieldQueryFactory qf = DefaultQueryFactory.getInstance();
        FieldQuery fieldQuery = qf.createFieldQuery();
        Collection<String> selectedFields = new ArrayList<String>();
        selectedFields.add(DEFAULT_AUTOCOMPLETE_SEARCH_FIELD);
        fieldQuery.addSelectedFields(selectedFields);
        fieldQuery.setConstraint(DEFAULT_AUTOCOMPLETE_SEARCH_FIELD, new TextConstraint(pattern,
                PatternType.wildcard, false, "en"));
        fieldQuery.setLimit(AUTOCOMPLETED_KEYWORD_NUMBER);
        fieldQuery.setOffset(0);


        List<String> result = new ArrayList<String>();
        QueryResultList<Representation> entityhubResult = referencedSiteManager.find(fieldQuery);
        for (Representation rep : entityhubResult) {
            result.add(rep.getFirst(DEFAULT_AUTOCOMPLETE_SEARCH_FIELD).toString());

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    private SiteManager referencedSiteManager;


    @Override
    public Map<String,List<RelatedKeyword>> search(String keyword) throws SearchException {
        Map<String,List<RelatedKeyword>> results = new HashMap<String,List<RelatedKeyword>>();
        FieldQuery fieldQuery = getFieldQuery(keyword);
        QueryResultList<Representation> externalEnties = referencedSiteManager.find(fieldQuery);
        String entityId = null;
        if (externalEnties != null && externalEnties.size() > 0) {
            entityId = externalEnties.iterator().next().getId();
            try {

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        return search(keyword);
    }


    private FieldQuery getFieldQuery(String keyword) {
        FieldQueryFactory qf = DefaultQueryFactory.getInstance();
        FieldQuery fieldQuery = qf.createFieldQuery();
        Collection<String> selectedFields = new ArrayList<String>();
        selectedFields.add(RDFS.label.getUnicodeString());
        fieldQuery.addSelectedFields(selectedFields);
        fieldQuery.setConstraint(RDFS.label.getUnicodeString(), new TextConstraint(keyword,
                PatternType.wildcard, false, "en"));
        fieldQuery.setLimit(1);
        fieldQuery.setOffset(0);
        return fieldQuery;
    }

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     * detected as similarity constraints
     */


    protected QueryResultList<Entity> query(Site dbpediaSite, String savedEntityLabel, String language,
            String extractionContext) throws SiteException {
        FieldQuery query = dbpediaSite.getQueryFactory().createFieldQuery();
        if (savedEntityLabel != null && !savedEntityLabel.isEmpty()) {
            Constraint labelConstraint;
            if (language != null) {
                labelConstraint = new TextConstraint(savedEntityLabel, false, language, null);
            } else {
                labelConstraint = new TextConstraint(savedEntityLabel, false);
            }
            // TODO: what happens if a recommendation was not based on rdfs:label?
            query.setConstraint(RDFS_LABEL.getUnicodeString(), labelConstraint);
        } else {
            log.warn("parsed label {} was empty or NULL. Will use Similarity constraint only!",
                savedEntityLabel);
        }
        query.setConstraint(SpecialFieldEnum.fullText.getUri(), new SimilarityConstraint(extractionContext));
        query.setLimit(25);


        return dbpediaSite.findEntities(query);
    }

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        log.debug("  > field  : " + field);
        log.debug("  > lang  : " + language);
        log.debug("  > limit : " + limit);
        log.debug("  > offset: " + offset);
        log.debug("  > ldpath: " + ldpath);
        FieldQuery query;
        if(ldpath != null && !ldpath.isEmpty()){ //STANBOL-417 
            query = new LDPathFieldQueryImpl();
            ((LDPathFieldQueryImpl)query).setLDPathSelect(ldpath);
        } else { //if no LDPath is parsed select the default field
            query = queryFactory.createFieldQuery();
            Collection<String> selectedFields = new ArrayList<String>();
            selectedFields.add(field); //select also the field used to find entities
            query.addSelectedFields(selectedFields);
        }
        if (language == null || language.trim().isEmpty()) {
            query.setConstraint(field, new TextConstraint(name, PatternType.wildcard, false));
        } else {
            query.setConstraint(field, new TextConstraint(name, PatternType.wildcard, false, language));
        }
        if (limit != null && limit > 0) {
            query.setLimit(limit);
        }
        if(offset != null && offset > 0) {
            query.setOffset(offset);
        }
        return query;
    }

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