| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.stanbol.enhancer.engines.entityhublinking; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.clerezza.rdf.core.Resource; |
| import org.apache.clerezza.rdf.core.UriRef; |
| import org.apache.clerezza.rdf.core.impl.PlainLiteralImpl; |
| import org.apache.stanbol.enhancer.engines.entitylinking.Entity; |
| import org.apache.stanbol.enhancer.engines.entitylinking.EntitySearcher; |
| import org.apache.stanbol.enhancer.engines.entitylinking.EntitySearcherException; |
| import org.apache.stanbol.entityhub.servicesapi.Entityhub; |
| import org.apache.stanbol.entityhub.servicesapi.EntityhubException; |
| import org.apache.stanbol.entityhub.servicesapi.model.Representation; |
| import org.apache.stanbol.entityhub.servicesapi.model.rdf.RdfResourceEnum; |
| import org.apache.stanbol.entityhub.servicesapi.query.FieldQuery; |
| import org.apache.stanbol.entityhub.servicesapi.query.QueryResultList; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.util.tracker.ServiceTrackerCustomizer; |
| |
| public final class EntityhubSearcher extends TrackingEntitySearcher<Entityhub> implements EntitySearcher { |
| |
| private final Integer limit; |
| private Map<UriRef,Collection<Resource>> originInfo; |
| |
| public EntityhubSearcher(BundleContext context, Integer limit) { |
| this(context,limit,null); |
| } |
| public EntityhubSearcher(BundleContext context, Integer limit,ServiceTrackerCustomizer customizer) { |
| super(context,Entityhub.class,null,customizer); |
| this.limit = limit != null && limit > 0 ? limit : null; |
| this.originInfo = Collections.singletonMap( |
| new UriRef(RdfResourceEnum.site.getUri()), |
| (Collection<Resource>)Collections.singleton( |
| (Resource)new PlainLiteralImpl("entityhub"))); |
| } |
| |
| @Override |
| public Entity get(UriRef id,Set<UriRef> fields, String...languages) throws EntitySearcherException { |
| if(id == null || id.getUnicodeString().isEmpty()){ |
| return null; |
| } |
| Entityhub entityhub = getSearchService(); |
| if(entityhub == null){ |
| throw new EntitySearcherException("The Entityhub is currently not active"); |
| } |
| org.apache.stanbol.entityhub.servicesapi.model.Entity entity; |
| try { |
| entity = entityhub.getEntity(id.getUnicodeString()); |
| } catch (EntityhubException e) { |
| throw new EntitySearcherException("Exception while getting "+id+ |
| " from the Entityhub",e); |
| } |
| if(entity != null){ |
| Set<String> languageSet; |
| if(languages == null || languages.length < 1){ |
| languageSet = null; |
| } else if (languages.length == 1){ |
| languageSet = Collections.singleton(languages[0]); |
| } else { |
| languageSet = new HashSet<String>(Arrays.asList(languages)); |
| } |
| return new EntityhubEntity(entity.getRepresentation(), fields, languageSet); |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public Collection<? extends Entity> lookup(UriRef field, |
| Set<UriRef> includeFields, |
| List<String> search, |
| String[] languages, |
| Integer limit, Integer offset) throws EntitySearcherException { |
| Entityhub entityhub = getSearchService(); |
| if(entityhub == null){ |
| throw new EntitySearcherException("The Entityhub is currently not active"); |
| } |
| FieldQuery query = EntitySearcherUtils.createFieldQuery(entityhub.getQueryFactory(), |
| field, includeFields, search, languages); |
| if(limit != null && limit > 0){ |
| query.setLimit(limit); |
| } else if(this.limit != null){ |
| query.setLimit(this.limit); |
| } |
| if(offset != null && offset.intValue() > 0){ |
| query.setOffset(offset.intValue()); |
| } |
| QueryResultList<Representation> results; |
| try { |
| results = entityhub.find(query); |
| } catch (EntityhubException e) { |
| throw new EntitySearcherException("Exception while searchign for "+ |
| search+'@'+Arrays.toString(languages)+"in the Entityhub", e); |
| } |
| if(!results.isEmpty()){ |
| Set<String> languagesSet = new HashSet<String>(Arrays.asList(languages)); |
| Collection<Entity> entities = new ArrayList<Entity>(results.size()); |
| for(Representation result : results){ |
| entities.add(new EntityhubEntity(result, null, languagesSet)); |
| } |
| return entities; |
| } else { |
| return Collections.emptyList(); |
| } |
| } |
| |
| @Override |
| public boolean supportsOfflineMode() { |
| return true; //the entityhub is always offline |
| } |
| |
| @Override |
| public Integer getLimit() { |
| return limit; |
| } |
| |
| @Override |
| public Map<UriRef,Collection<Resource>> getOriginInformation() { |
| return originInfo; |
| } |
| |
| } |