/*
* 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.keywordextraction.linking.impl;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.apache.stanbol.enhancer.engines.keywordextraction.linking.EntitySearcher;
import org.apache.stanbol.entityhub.servicesapi.Entityhub;
import org.apache.stanbol.entityhub.servicesapi.EntityhubException;
import org.apache.stanbol.entityhub.servicesapi.model.Entity;
import org.apache.stanbol.entityhub.servicesapi.model.Representation;
import org.apache.stanbol.entityhub.servicesapi.query.FieldQuery;
import org.apache.stanbol.entityhub.servicesapi.query.QueryResultList;
import org.osgi.framework.BundleContext;
public final class EntityhubSearcher extends TrackingEntitySearcher<Entityhub> implements EntitySearcher {
private final Integer limit;
public EntityhubSearcher(BundleContext context, Integer limit) {
super(context,Entityhub.class,null);
this.limit = limit != null && limit > 0 ? limit : null;
}
@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();
}
@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();
}
@Override
public boolean supportsOfflineMode() {
return true; //the entityhub is always offline
}
@Override
public Integer getLimit() {
return limit;
}
}